Best Time to Visit Key West: 2026 Month-by-Month Weather Guide

The best time to visit Key West is a question with three honest answers depending on what matters most to you. If you want guaranteed sunny weather and crystal-clear water at any cost, the answer is January through March. If you want the perfect balance of warm-but-not-hot weather, lower humidity, fewer crowds, and shoulder-season pricing, the answer is April through May or November through mid-December. If you want the lowest possible prices and don’t mind some weather risk, the answer is September. This guide is the complete month-by-month breakdown — temperature, humidity, water temperature, rainfall, hurricane risk, hotel pricing, event calendar, sunset times, and what each month does best — so you can match your trip to your priorities. Written by Key West locals who plan their own travel around the same calendar.

You will find detailed weather data for each month, the seasonal pricing chart most other guides skip, the festival and event calendar (Hemingway Days, Fantasy Fest, Lobster Mini-Season, Songwriters Festival, Pridefest, Conch Republic Independence, holiday boat parade), the cold-front guide for winter visitors (Jan-Feb fronts can drop temps to the 50s and trash snorkel visibility for a few days), the hurricane historical data, the sargassum-by-month chart, and an honest take on the best month for specific activities (snorkeling, fishing, romance, family vacations, weddings, photography). Plus what to avoid (Fantasy Fest week if you’re traveling with kids, Christmas-NYE for budget travelers, August-September for hurricane risk-averse).

Key West Weather: The Quick Answer

Key West has a tropical savanna climate. Highs run 75-90°F year-round; lows 65-80°F. Two seasons matter: dry season (December-April) with low humidity, calm seas, and minimal rain; and wet/hurricane season (May-November) with higher humidity, afternoon thunderstorms, and named-storm risk. Water temperature ranges from 70°F in February to 86°F in August.

The trade-offs come down to: dry season is more reliable weather but more expensive and more crowded; wet season is hot, humid, and storm-risky but cheaper and emptier.

Best Time to Visit Key West Month by Month

January in Key West

Weather: 65-75°F, 2.0″ rain, 70% humidity, water 72°F.
Crowds: Snowbird peak; busy but manageable.
Pricing: Peak season ($400-1,000+/night).
Pros: Reliable sunny weather, low rain, perfect for sailing/kayaking.
Cons: Cold fronts can drop temps to the 50s for 2-3 days.
Notable events: Key West Literary Seminar.

February in Key West

Weather: 65-77°F, 1.5″ rain, calm seas, water 71°F.
Crowds: Peak season — Presidents’ Day weekend hits hard.
Pricing: Peak ($400-1,000+/night).
Pros: Driest month of the year, peak sailfish bite.
Cons: Coolest water of the year for snorkeling; February cold fronts are real.
Notable events: Key West Race Week (sailing), Old Island Days kickoff.

March in Key West

Weather: 70-79°F, 1.8″ rain, water 74°F.
Crowds: Spring break mid-month is busy.
Pricing: Peak ($450-1,100/night).
Pros: Warm, dry, perfect weather for outdoor activities.
Cons: Spring break crowds peak weeks 2-3.
Notable events: Conch Republic Independence Celebration (late April rolls into early May for some events).

April in Key West (Top Pick)

Weather: 73-82°F, 2.2″ rain, lower humidity, water 77°F.
Crowds: Shoulder begins; spring break ends.
Pricing: Drops 30-40% from March peak ($300-700/night).
Pros: Best balance of weather, price, and crowds. Mahi season starts. Sailfish tail end.
Cons: None significant.
Notable events: Conch Republic Independence Celebration (~April 18-27), Taste of Key West.

May in Key West (Top Pick)

Weather: 76-85°F, 3.5″ rain, water 80°F.
Crowds: Light shoulder.
Pricing: Continues lower ($280-650/night).
Pros: Water warm enough for long snorkel sessions. Hurricane season hasn’t started. Mahi peak begins.
Cons: Afternoon thundershowers begin some days.
Notable events: Key West Songwriters Festival (early May).

June in Key West

Weather: 79-88°F, 4.5″ rain, humidity climbs to 75%, water 84°F.
Crowds: Light.
Pricing: Low ($250-550/night).
Pros: Calmest seas of the year (early June). Mahi peak. Lowest crowds you’ll find with summer-warm weather.
Cons: Hurricane season starts June 1 (statistically calmest hurricane month). Humidity climbs.
Notable events: Pridefest.

July in Key West

Weather: 80-89°F, 3.5″ rain, water 86°F (warmest).
Crowds: Family summer vacation crowds; Hemingway Days week packs Old Town.
Pricing: Mid-season ($300-650/night).
Pros: Warmest water of the year, longest daylight, peak mahi.
Cons: High humidity, frequent afternoon thunderstorms.
Notable events: Hemingway Days (3rd week of July), Lobster Mini-Season (last consecutive Wed-Thu of July — the entire island fills with divers).

August in Key West

Weather: 80-90°F, 5.5″ rain, humid (78%), water 86°F.
Crowds: Light — heat keeps tourists away.
Pricing: Lowest hotel rates of the year ($230-500/night).
Pros: Lobster regular season opens August 6. Cheapest hotel rates.
Cons: Heat and humidity peak. Hurricane risk is real.
Notable events: Lobster season opener.

September in Key West (Cheapest, Riskiest)

Weather: 79-88°F, 6.0″ rain, water 86°F.
Crowds: Lowest of the year.
Pricing: Cheapest month ($200-450/night).
Pros: Cheapest hotels, emptiest beaches.
Cons: Peak hurricane risk (statistically highest). Schools back in session.
Notable events: Womenfest (early September LGBTQ+ event for women).

October in Key West (Avoid the Last Week)

Weather: 76-85°F, 4.8″ rain, water 84°F.
Crowds: Calm first three weeks; chaos last week (Fantasy Fest).
Pricing: Shoulder ($300-650/night first three weeks; $700-1,500+ Fantasy Fest week).
Pros: Cooler weather returning, hurricane risk easing.
Cons: Hurricane risk continues; Fantasy Fest week packs the island and triples prices.
Notable events: Fantasy Fest (last week of October — adults only, costume festival).

November in Key West

Weather: 72-81°F, 2.5″ rain, water 80°F.
Crowds: Shoulder; Thanksgiving weekend spike.
Pricing: Shoulder ($300-650/night).
Pros: Hurricane season ends Nov 30. Perfect weather returning.
Cons: Thanksgiving week is busy.
Notable events: Powerboat Races (early November), Pirates in Paradise.

December in Key West

Weather: 68-77°F, 2.0″ rain, water 74°F.
Crowds: Light first two weeks; explosion last week through New Year.
Pricing: Shoulder first two weeks ($350-700/night), peak holiday surge ($600-1,500+).
Pros: Holiday Fest, Christmas Boat Parade, NYE drag-queen drop at Bourbon Street Pub, NYE conch shell drop at Sloppy Joe’s. Magical first half of month.
Cons: Last week is most expensive of year.
Notable events: Holiday Fest (early Dec), Lighted Boat Parade, NYE drag queen drop, NYE conch shell drop.

Best Time by Activity

Best Time for Snorkeling

June-September for warmest water (84-86°F) and best visibility (50-100 ft). May and October are excellent shoulder picks. December-February are coolest (70-74°F water) and have occasional cold-front visibility drops.

Best Time for Deep Sea Fishing

Sailfish: December-April. Mahi: April-August. Blue marlin: May-August. Wahoo: November-March. Blackfin tuna: year-round, peak January-April. May and June are particularly strong all-around.

Best Time for Romance

April-May or November to mid-December. Warm weather, low humidity, fewer crowds, shoulder-season pricing on luxury resorts.

Best Time for Families

Spring break weeks aside, mid-March through May is ideal — kids can swim, weather is comfortable, hurricane season hasn’t started. Late October-November is also excellent for families wanting fall break.

Best Time for Weddings

April-May and November-mid-December. Both deliver photography-ready weather and shoulder-season vendor pricing.

Best Time for Budget Travel

September is the cheapest month statistically. August and the first three weeks of October (avoiding Fantasy Fest) are also significantly cheaper than peak winter.

Hurricane Season in Key West

Atlantic hurricane season runs June 1 to November 30. Peak risk is August through October. Key West has been hit directly by major hurricanes (Wilma 2005 Category 3, Irma 2017 Category 4 nearby). Direct hits in any given week are statistically rare, but the climate of risk is real and meaningful for travel planning.

Travel insurance is strongly recommended for any trip booked between July and October. Most policies cover hurricane-related cancellations if a hurricane warning is issued for your destination during your trip.

If a storm threatens during your trip: Most major Key West resorts have established hurricane protocols. Listen to the local emergency management messages. Mandatory evacuations are issued well in advance for serious storms. Don’t drive during the storm itself — the Overseas Highway is the only road off the island.

Sargassum (Seaweed) Calendar

Sargassum is the brown floating seaweed that washes onto Key West beaches in summer. It’s a normal part of Florida ecology but recent years have seen historically high volumes.

Worst months: May through November, peaking in July, August, and September.

Best months (minimal sargassum): December through April.

The City of Key West rakes Smathers Beach daily during peak sargassum weeks, but offshore mats can still be visible from shore. Water remains swimmable a few yards out. The smell when sargassum decomposes can be pungent.

Cold Fronts: The Winter Wild Card

Key West’s biggest weather wild card is the winter cold front. From late November through early March, cold fronts moving south through Florida can drop Key West temps from 80°F to 55°F overnight, kick up the wind to 25 mph, and trash snorkel visibility for 1-3 days.

If your trip is in winter, build flexibility — alternate plans for cold/windy days (museums, distillery tour, indoor restaurants) — and don’t book your reef snorkel for the day a front is forecast.

Hotel Pricing by Season (2026)

Honest hotel rate ranges by season at quality 3-4 star Key West properties.

Christmas-New Year week: $600-1,500+/night. Highest of year.

January-March: $400-1,000/night. Peak season.

April: $300-700/night. Shoulder begins.

May: $280-650/night.

June-July: $250-550/night. Summer.

August: $230-500/night. Lowest hotel rates of the year.

September: $200-450/night. Cheapest, with hurricane risk.

October (first 3 weeks): $300-650/night.

Fantasy Fest week (last week of October): $700-1,500+/night.

November: $300-650/night.

December (first 3 weeks): $350-700/night.

Vacation rentals run roughly 30-40% lower than hotels in shoulder seasons, less of a discount in peak.

Worst Times to Visit Key West

Christmas-New Year week: Most expensive, most crowded, hardest reservations.

Fantasy Fest week (last week of October): Adults-only, costume-focused, packed island, triple pricing. Avoid with kids; love it as adults if that’s your scene.

Spring break weeks (mid-March): College spring break crowds.

Mini-Lobster Season (last Wed-Thu of July): Diver invasion; book months ahead or skip.

August-September if hurricane-averse: Highest hurricane risk, hot, humid.

Sunset Times in Key West

Approximate sunset times by month for planning Mallory Square Sunset Celebration:

January: ~5:55 p.m.
February: ~6:15 p.m.
March: ~7:35 p.m. (DST starts)
April: ~7:50 p.m.
May: ~8:05 p.m.
June: ~8:20 p.m. (latest)
July: ~8:25 p.m.
August: ~8:05 p.m.
September: ~7:35 p.m.
October: ~7:00 p.m.
November: ~5:45 p.m. (DST ends)
December: ~5:45 p.m.

Mallory Square performers begin gathering ~2 hours before sunset.

Frequently Asked Questions

What is the best month to go to Key West?

April for the best balance of weather, price, and crowds. May is a close second. November and the first three weeks of December are also excellent.

What is the cheapest time to visit Key West?

September has the cheapest hotel rates ($200-450/night) but the highest hurricane risk. August is similarly cheap. October’s first three weeks are also significantly less expensive than peak winter.

When is hurricane season in Key West?

June 1 through November 30. Peak hurricane risk is August through October. Travel insurance is strongly recommended for trips in this window.

Is Key West crowded in March?

Yes — March is one of the busier months due to spring break and snowbird overlap. Mid-March is particularly crowded. The week before and the week after Easter spike further.

When is the rainy season in Key West?

May through October. June-September are wettest, with frequent afternoon thunderstorms. Rain typically arrives in short bursts rather than all-day events.

When is Fantasy Fest in Key West?

The last full week of October each year (typically October 18-27 or 23-25). Adults-only costume festival. 2026 dates: October 16-25.

Is Key West too hot in July?

July is hot and humid but manageable. Highs run 80-89°F with high humidity and afternoon thunderstorms. Plan outdoor activities for morning, take air-conditioned breaks midday, and accept the heat as part of summer Key West.

When does it rain the most in Key West?

September is the wettest month (6 inches average). May-November all see significantly more rain than December-April.

What is the warmest month in Key West?

July and August are tied for warmest air temperatures (highs around 89-90°F). August water temperatures peak at about 86°F.

When is the best time for sunsets at Mallory Square?

Sunsets are spectacular year-round, but the most photogenic combinations happen in clear-air winter months (December-February) and after summer thunderstorms (when clouds add color). Show up 90 minutes before sunset for the best vantage points.

What month has the calmest seas in Key West?

June (early month) typically has the calmest sea conditions. Late February and March are also generally calm. Sea conditions degrade after winter cold fronts and during summer afternoon storms.

When is lobster season in Key West?

Recreational mini-season is the last consecutive Wednesday and Thursday of July (massive crowds — book accommodations months ahead). Full Florida spiny lobster season is August 6 through March 31.

Final Thoughts: How to Pick Your Trip Date

The honest summary: April and May deliver the best value-for-weather ratio in Key West. November and the first three weeks of December are nearly as good. Peak winter (January-March) gives you the most reliable weather but at peak prices and crowds. September delivers rock-bottom prices with real hurricane risk. Avoid the last week of October if you have kids; embrace it if you want costume chaos. Avoid the last week of December for the highest prices of the year. The rest is preference.

For more on planning your trip, see our complete Key West vacation planning guide, our Key West events and festivals calendar, our Key West on a budget guide, our where to stay guide, and our things to do in Key West guide.