Sheet 15 · Vacation Planning
Key West in August: Weather, Events, and What to Expect
Hot, wet, cheap and uncrowded: August heat and storms, an honest take on peak hurricane season, the warmest water of the year, lobster season and Lobsterfest, coral spawning, late-summer deals and what to skip.
In the first week of August, the chalkboards outside Key West’s seafood restaurants change. “Fresh local lobster” goes up in big letters, and the traps that have sat stacked in yards on Stock Island since spring go back in the water, their painted buoys bobbing across the shallows. Then, a week or so later, schools on the mainland go back, and the island empties out almost overnight. The Conch Train runs half full. Nobody needs a dinner reservation. The bartender has time to tell you about their boat. Key West in August is hot, wet, cheap and wonderfully uncrowded. It’s the month locals quietly love, and the start of the part of the year when the weather deserves real respect.
This guide covers the August heat and rain, what the peak of hurricane season actually means for a booking, the warmest water of the year, the August 6 opening of lobster season and Lobsterfest, coral spawning, the late-summer price drop, what’s worth doing, what isn’t, and how August compares with July and September. Weather figures are NOAA 1991–2020 normals for Key West International Airport. Prices and dates were checked in September 2026; treat prices as the right order of magnitude and confirm 2027 dates before you book.
Key West in August at a glance
| Detail | August |
|---|---|
| Average high | About 91°F, the hottest month of the year |
| Average low | About 81°F |
| Sea temperature | About 89°F, the warmest of the year |
| Rainfall | About 5.4 inches, on around 15 days |
| Sunrise / sunset | About 6:55–7:10 a.m. / 8:10 p.m. early in the month, 7:50 p.m. by the end |
| Hurricane risk | Moderate and rising. The peak of the season begins mid-month |
| Sargassum | Possible on Atlantic-facing beaches, usually easing late in the month |
| Crowds | Busy in the first week, then among the quietest weeks of the year |
| Hotel prices | Low, with some of the best rates of the year after mid-month |
| Key dates (2027) | Lobster season opens August 6; Lobsterfest early in the month; Labor Day weekend September 4–6 |
| On the plate | Fresh spiny lobster, mahi-mahi, snapper, grouper. Stone crab is still closed |
What an August trip costs
August is when Key West’s room rates fall hardest, and the second half of the month brings some of the lowest prices of the year for good hotels. The catch is that the cheapest rates are often prepaid and non-refundable, which is exactly what you don’t want in hurricane season (more on that below). Here are the benchmarks, checked in September 2026:
| Item | Price | Notes |
|---|---|---|
| Lobsterfest street fair | Free | Duval Street; you pay for food and drink |
| Sunset at Mallory Square | Free | About 8:10 p.m. early in August, 7:50 by month’s end |
| Florida non-resident saltwater license | About $17 for 3 days, $30 for 7 days | Plus a $5 spiny lobster permit if you want to catch your own; confirm with FWC |
| Dry Tortugas ferry (Yankee Freedom) | Check the current fare | 8:00 a.m. to 5:15 p.m.; includes park entry, snorkel gear and a fort tour |
| Looe Key snorkel trip, Big Pine Key | $54 with gear | Captain Hook’s, 8:30 a.m. and 1:00 p.m. |
| Bahia Honda State Park | $8 per vehicle + $0.50 per person | 8:00 a.m. to sundown |
| The Turtle Hospital, Marathon | $38 adult, $19 child 4–12 | Guided tours every half hour, a good rainy-afternoon option |
August weather: hot, wet and heavy
August is the hottest month in Key West by a whisker. The average high is about 91°F, the average low about 81°F, and the heat index spends most afternoons north of 100°F. It feels a lot like July, with more rain and less wind. The trade winds that make July bearable weaken in August, and some afternoons the air barely moves. Those are the days that send visitors indoors. On a breezy August day, it’s hot but perfectly pleasant in the shade.
Rain climbs noticeably. August averages about 5.4 inches on around 15 days, so on about half the days of the month it will rain at some point. Most of it still comes as the classic summer afternoon storm, sharp and heavy and gone within an hour, but August storms are bigger, more frequent and more electric than June’s, and some build later into the evening. Now and then a tropical wave brings a properly gray, wet day, or two, with rain bands coming through on and off from morning to night.
The days start to shorten, too. Sunset is around 8:10 p.m. on August 1 and closer to 7:50 p.m. by the end of the month.
Hurricane season in August: the honest version
This is the part of the guide that matters most. The Atlantic hurricane season runs from June 1 to November 30, but it isn’t evenly spread. Activity picks up sharply from mid-August, peaks in September and stays high through October. August is the month the season gets serious.
That doesn’t mean you shouldn’t come. In any given week, the chance of a hurricane hitting the Keys is small, and the great majority of August visitors see nothing worse than thunderstorms. But the downside, if it does happen, is significant, and it’s worth understanding how it plays out:
- Visitors are evacuated first. When a hurricane threatens, Monroe County typically orders visitors out days before residents, often before the storm has even decided where it’s going. Hotels close, and your trip ends early.
- There’s one road out. Everyone leaves on US 1, the Overseas Highway, and it’s a long, slow drive to the mainland when half the Keys is on it.
- Flights fill fast. Key West International is small, and seats out go quickly once an evacuation looks likely.
- A near miss still costs you. Even a storm that turns away can mean days of canceled boat trips, closed beaches and rough seas.
So in August, book refundable. Choose a flexible rate even if it costs more, check the hotel’s hurricane policy (many of the better Key West hotels have one that waives cancellation fees when an evacuation order is issued), and buy travel insurance with hurricane cover when you book, not when a storm appears. Policies won’t pay out for a named storm that already existed when you bought them. Once you’re here, glance at the National Hurricane Center’s outlook each morning. Our cheapest time to visit Key West guide weighs the savings against the risk.
The water in August
The sea hits its annual high in August, about 89°F on average and warmer in the shallows. In the channels and on the flats it can feel less like swimming and more like sitting in a warm bath. On the calm mornings the reef is spectacular: flat water, warm all the way down, and visibility that makes the Sambos and Sand Key look like a postcard.
That heat is also a warning sign. Very warm water stresses coral, and in hot summers parts of the Florida Keys reef bleach, as they did severely in the marine heatwave of 2023. Treat the reef gently. Wear a rash guard instead of slathering on sunscreen, choose mineral, reef-safe formulas when you do use it, and never stand on or touch coral.
Sargassum can still be a nuisance on the Atlantic-facing beaches in August, especially in a heavy year, although it often eases later in the month. As always, the western and sheltered beaches such as Fort Zachary Taylor are the safer bet, and it’s worth checking recent reports before you plan a beach day.
Coral spawning
August has one of the most remarkable natural events in the Keys. A few nights after the August full moon (and sometimes in September), many of the reef’s corals spawn at the same time, releasing tiny bundles of eggs and sperm that drift up through the dark water like an upside-down snowstorm. Scientists and reef restoration groups plan their whole year around it. The timing is predictable only to within a few nights, so it’s not something to build a trip around, but if you’re a certified diver visiting after the August full moon, ask the dive shops whether they’re running spawning night dives.
Lobster season opens: August 6
After the two-day sport season at the end of July, Florida’s regular spiny lobster season opens on August 6 and runs until March 31. Commercial trappers are allowed to set their traps a few days before, and from the 6th the first fresh local lobster of the season is on menus all over town. It’s the best reason to eat seafood in Key West in August: grilled tails, lobster rolls, lobster mac and cheese, and a whole broiled lobster at a waterfront table as the sun goes down.
If you’d rather catch your own, August is a far better time to learn than mini-season. The crowds have gone, the water is warm and calm, and several Key West charters run guided lobster snorkel trips. You’ll need a Florida saltwater fishing license and a spiny lobster permit, a measuring gauge, and to stick to the Monroe County limit. Our Key West lobster season guide covers the rules, the gear and the technique, and our Key West seafood restaurants guide covers where to eat it.
Key West Lobsterfest
Lobsterfest celebrates the opening of the season with five days of lobster-themed parties on and around Duval Street, ending in a big Saturday street fair. The 2026 festival, the 28th, ran August 5–9, with its main venue at Rick’s and Durty Harry’s at 202–208 Duval. It’s free to attend, with food, drinks and a traditional lobster boil, and it’s lively, crowded and good-natured. Expect the 2027 edition around the same dates.
Is it worth a special trip? For most people, no. It’s essentially a Duval Street block party with lobster, and you can eat just as well at a good seafood restaurant any night of the month. If you’re in town anyway, the Saturday street fair is a fun evening.
The rest of the calendar
Beyond lobster, August is the emptiest month on the Key West events calendar, and that’s the point. Live music plays nightly on Duval, the sunset celebration at Mallory Square happens every evening, and the island’s bars and restaurants are as friendly as they get all year. Labor Day weekend (September 4–6 in 2027) brings a short burst of Florida visitors at the end of the month. Key West Brewfest was traditionally held over Labor Day, but the 2026 edition moved to early October, so check before you plan around it. For the full calendar, see our Key West events guide.
Crowds and prices in August
August is really two months. The first week is lively, with Floridians down for the start of lobster season, Lobsterfest and the last family trips before school. Then most mainland schools go back around mid-month, and Key West goes quiet. The last two weeks of August are among the least crowded of the entire year.
| Period (2027) | Crowds | Prices | Notes |
|---|---|---|---|
| August 1–9 | Moderate to busy | Mid | Lobster season opens, Lobsterfest, last summer families |
| August 10–20 | Low | Low | Schools go back; the island empties |
| August 21–31 | Very low | Among the lowest of the year | Some restaurants and shops close for staff vacations |
| Labor Day weekend (Sept 4–6) | Moderate | Rising briefly | A short burst of Florida visitors |
One thing that catches people out: from late August into September, some Key West restaurants, bars and small shops close for a week or three while owners and staff take their own vacations or renovate. If there’s a particular place you’ve been dreaming about, check that it’s open before you fly.
For ideas on stretching a budget further, see our Key West on a budget and Key West trip cost guides.
What to do in Key West in August
Eat lobster
You won’t find it fresher. Fresh local lobster in the first weeks of the season is the one August experience you can’t get in April. Try it simply grilled with butter and lime, and get the key lime pie after.
Get on the reef early
Morning snorkel and dive trips are the best way to spend an August morning: warm, flat water and back at the dock by lunch. The afternoon trips are more likely to be cut short by storms. See our Key West snorkeling guide.
Fish the flats at dawn, or go offshore
August fishing is best early. Bonefish and permit feed on the flats at first light, before the water heats up, and a dawn flats trip is one of the loveliest ways to see the backcountry. Offshore, mahi are thinning out but still around, and the reef and wrecks produce snapper and grouper. See our Key West flats fishing and Key West fishing seasons guides.
Take the Dry Tortugas ferry
The crossing is usually calm, the water around Fort Jefferson is warm and clear, and in the second half of August the ferry is noticeably less crowded. Keep an eye on the forecast and have a backup day, since a tropical system can cancel departures. See our Dry Tortugas day trip guide.
Retreat indoors in the afternoon
The Hemingway Home, the Mel Fisher Maritime Museum, the Custom House, the Key West Aquarium and the Shipwreck Treasure Museum are all good places to wait out an afternoon storm, and a spa afternoon at one of the resorts is August’s great guilty pleasure. See our Key West rainy day activities and Key West spa guides.
Enjoy the empty island
The real luxury of late August is space. You can walk into the restaurants that were impossible in March, find a quiet corner at the sunset celebration, and ride a bike through Old Town at seven in the morning without meeting another tourist. If you like Key West for its people and its pace, not just its parties, late August is the island at its most local.
What isn’t worth it in August
- Non-refundable bookings. The cheapest August rates are often prepaid and non-cancellable. In hurricane season, a flexible rate is worth the difference.
- A multi-attraction pass. In August heat, most people manage two attractions a day at most, and a bundled pass rarely pays for itself. Buy tickets as you go. Our Key West discount passes guide does the math.
- A midday sightseeing marathon. Old Town at 1 p.m. in August is punishing. Walk early and late, and rest in between.
- A beach wedding with no rain plan. Late afternoon, when most couples want to marry, is also when August storms roll through. Have a covered backup.
- Traveling just for Lobsterfest. It’s a fun street party if you’re here, not a reason to fly in.
A five-day August itinerary
- Day 1: Arrive and swim. Sunset at Mallory Square, and a first fresh lobster dinner.
- Day 2: Morning snorkel trip. Lunch, then the pool or a museum through the afternoon storm. Evening stroll and live music.
- Day 3: Dry Tortugas on the 8:00 a.m. ferry. An easy dinner close to your hotel.
- Day 4: Dawn flats fishing or a sunrise kayak through the mangroves. Afternoon at the Hemingway Home or a spa. Sunset sail if the sky looks clear.
- Day 5: Early bike ride through an empty Old Town, Cuban coffee, key lime pie and home.
Keep one day flexible for weather. In August you’ll often want to move a boat trip by a day. Our Key West 3-day itinerary works well for a shorter trip.
What to watch out for in August
- The tropics. Check the National Hurricane Center’s outlook every morning, and follow any Monroe County evacuation order immediately.
- Heat illness. August is the hottest month, and the breeze often fails. Drink water constantly, use electrolytes, and take the midday break seriously.
- Lightning. Get off the water and the beach when you hear thunder. August storms are the most electric of the year.
- Flooded streets. Heavy downpours and high tides can briefly flood low-lying streets in Old Town and New Town. Don’t drive or scoot through standing water, because salt water ruins engines.
- Mosquitoes and no-see-ums. They’re at their worst in the wettest months. Bring repellent, especially for dusk.
- Closed businesses. Check that restaurants and tours are open in late August.
August for different kinds of travelers
Budget travelers
This is your month. Late August has some of the lowest rates of the year at good hotels, and even the higher-end resorts run offers. Just book flexible, buy insurance and keep one eye on the tropics. Our affordable Key West hotels guide lists the best value.
Families
The first ten days of August are the last chance for a summer family trip before school. The water is perfect for children, and the pool will be the highlight. After that, most families are home. See our Key West with kids guide.
Couples
An empty island, easy reservations, warm evenings and lower prices make late August surprisingly romantic, provided you don’t mind a few storms. See our Key West romantic getaway guide.
Divers and snorkelers
Warm, calm water and uncrowded boats make it a very good month, especially mornings. Divers may even catch the coral spawn.
Beyond Key West in August
- Looe Key Reef, off Ramrod Key at MM 27, is excellent on calm August mornings. See our Looe Key Reef guide.
- Bahia Honda State Park (MM 37), for its sheltered bay-side Calusa Beach when the Atlantic side has seaweed.
- The Turtle Hospital in Marathon, a short tour that works just as well in the rain. See our Turtle Hospital guide.
What to pack for August
- Your lightest, most breathable clothes
- Several swimsuits, because nothing dries
- A long-sleeved rash guard and a wide-brimmed hat
- Reef-safe mineral sunscreen and polarized sunglasses
- A good packable rain jacket and a compact umbrella
- Insect repellent
- Sandals that can get wet, and water shoes
- An insulated water bottle and electrolyte packets
- Copies of your travel insurance and hotel cancellation policy
See our Key West packing list for the complete checklist.
August vs July vs September
| July | August | September | |
|---|---|---|---|
| Average high / low | 90°F / 81°F | 91°F / 81°F | 89°F / 79°F |
| Sea temperature | About 86°F | About 89°F | About 86°F |
| Rainfall | 3.6 in, 12 days | 5.4 in, 15 days | 7.2 in, 16 days, the wettest month |
| Crowds | Moderate, three busy weekends | Busy first week, then very quiet | The quietest month |
| Prices | Mid | Low | Lowest |
| Headline events | July 4, Hemingway Days, mini-season | Lobster season opens, Lobsterfest | Very few |
| Hurricane risk | Low, rising | Moderate, rising | Highest of the year |
For the month before, see Key West in July, and for the whole year our Key West month by month guide.
Is August a good time to visit Key West?
It depends on how you weigh price and space against weather risk. August gives you the warmest water of the year, fresh local lobster, some of the lowest hotel rates on the calendar and an island with room to breathe, especially in the second half of the month. For flexible travelers who love the water and don’t mind heat, it’s a genuinely good month.
It’s a poor choice for a trip you can’t move: a wedding with guests flying in, a milestone birthday or anything expensive and non-refundable. It’s also hard going for anyone who wilts in heat and humidity. If that’s you, April, May or November give you warm water without the storms or the steam. Our best time to visit Key West guide compares the options.
Frequently asked questions
Is August a bad time to visit Key West?
Not bad, but it comes with trade-offs. It’s the hottest month and the start of peak hurricane season, but it also has the warmest water, low prices and small crowds. Book flexible rates and buy travel insurance.
How hot is Key West in August?
Average highs are about 91°F and lows about 81°F, with a heat index regularly above 100°F in the afternoon. It’s the hottest month of the year, by a small margin over July.
Does it rain a lot in Key West in August?
More than in early summer: about 5.4 inches on around 15 days. Most rain comes as short, heavy afternoon thunderstorms, but tropical waves occasionally bring a gray, wet day.
Is August hurricane season in Key West?
Yes. The season runs from June 1 to November 30, and activity rises sharply from mid-August, peaking in September. A direct hit in any given week is unlikely, but plan for the possibility.
When does lobster season start in Key West?
The regular spiny lobster season opens on August 6 and runs through March 31. The two-day sport season falls on the last Wednesday and Thursday of July.
When is Key West Lobsterfest?
In early August, around the opening of lobster season. The 2026 festival ran August 5–9 on Duval Street and was free to attend.
How warm is the water in Key West in August?
About 89°F on average, the warmest of the year, and warmer still in the shallows.
Tempted to wait a few more weeks for an even emptier island? September brings the lowest room rates of the year and water that’s still about 86°F, but also the wettest weather and the statistical peak of hurricane season. Our Key West in September guide explains who it suits and how to book it safely.
Related Key West Guides
- Key West month by month: every month compared
- Key West in July: the month before
- Key West lobster season: rules, gear and where to eat
- Cheapest time to visit Key West: the savings and the risks
- Best time to visit Key West: weather, crowds and prices
- Key West events: the full calendar
Photo Credits
Lobster trap floats at Conch Key: Freshly painted floats ornament lobster traps at Conch Key (NARA 548766) by Flip Schulke, Public domain, via Wikimedia Commons.
Brain coral spawning: Brain coral spawning by NOAA, Emma Hickerson, Public domain, via Wikimedia Commons.
Sources & corrections
Rates, hours and closures verified against operator listings and on-island visits. Prices are peak-season unless noted.
