Key West Weather Guide: Hurricane Season and Best Conditions (2026)

Key West enjoys some of the most consistently warm, sunny, and reliably mild weather anywhere in the continental United States — it’s why people flock here from the frozen north all winter. But the island’s climate has two distinct seasons, a real hurricane season to understand, and daily quirks (hello, afternoon storms) worth knowing before you book. Here’s my complete Key West weather guide — temperatures by season, the wet and dry seasons, hurricane season explained, and exactly what to expect month to month.

Key West’s tropical climate in a nutshell

Key West sits at the southern tip of the U.S. with a hot tropical climate, surrounded by the warm waters of the Gulf and the Atlantic. That ocean influence keeps temperatures remarkably steady — it’s rarely truly cold, and rarely brutally hot, with the average barely shifting more than about 10°F between summer and winter. The island gets a lot of sunshine and, at roughly 39 inches of rain a year, actually less rainfall than mainland Florida. The two things that define the seasons here are humidity and rain, not temperature: a dry, pleasant winter and spring, and a humid, stormy summer and fall. Understanding that pattern is the key to timing your trip — and our best time to visit guide builds on exactly this.

The dry season: winter and spring (December–May)

This is Key West’s peak weather and peak tourist season for good reason. From December through May, the island enjoys warm, sunny days, low humidity, gentle breezes, and little rain — December through February are among the driest months of the year, with clear skies often continuing right through spring. Winter highs sit comfortably in the upper 70s to low 80s, with cooler nights (occasionally dipping into the 60s) — paradise when the rest of the country is freezing. Spring (March–May) may be the single best weather window: warm, sunny, dry, and slightly less crowded than mid-winter, with April and May often the sunniest, least humid months of all. If reliably gorgeous weather is your priority, this is when to come — just expect higher prices and bigger crowds, especially around the holidays and spring break.

The wet season: summer and fall (May–October)

From roughly May through October, Key West shifts into its wet, humid season. Temperatures climb to the upper 80s and low 90s, humidity is high, and the island sees its heaviest rainfall — June through September average several inches a month, with up to 20+ rainy days in the wettest months. But here’s the crucial nuance: the rain usually comes as brief, intense afternoon thunderstorms rather than all-day washouts. Mornings are often glassy and gorgeous, a storm rolls through in the afternoon, and the sun frequently returns in time for a spectacular sunset. So summer isn’t a write-off — it’s hot and sticky with predictable afternoon showers, but also the cheapest, least crowded time to visit, with warm water perfect for swimming. Just plan outdoor activities for the morning and keep a flexible afternoon.

Hurricane season: what you need to know

This is the big one travelers ask about. The Atlantic hurricane season officially runs June 1 through November 30, but statistically the peak risk is mid-August through October, with September historically the rainiest, stormiest month in Key West. Here’s the perspective: while the Keys do face hurricane risk, direct hits are relatively rare in any given year, and most summer/fall trips see nothing worse than the usual afternoon storms. That said, if you travel during hurricane season, take sensible precautions: buy travel insurance (with weather/cancellation coverage), monitor forecasts in the days before and during your trip, stay aware of any watches or warnings, and follow official guidance — if an evacuation is ordered for the Keys, heed it without delay (the single road out can clog quickly). Many travelers happily visit in summer and fall for the deals and thin crowds; you just need to stay weather-aware and flexible. Build a buffer into weather-dependent plans, and see our cheapest time to visit guide for the trade-offs.

Month-by-month weather snapshot

Here’s a quick look at what to expect each month:

• January–February: Driest, coolest months. Highs upper 70s–low 80s, cool nights, low humidity, lots of sun. Peak season.
• March–April: Warm, dry, and sunny with low humidity — arguably the best weather of the year. Spring break crowds in March.
• May: Warming up, the wet season begins late in the month, but still largely pleasant and a great-value shoulder month.
• June: Hot and humid, afternoon storms begin, hurricane season opens (though early-season risk is low). Warm water, fewer crowds.
• July–August: Hottest, most humid months — highs in the low 90s with daily afternoon thunderstorms. Glassy mornings, bathtub-warm water, lowest crowds.
• September: The rainiest, stormiest month and the peak of hurricane risk. Cheapest prices and emptiest island, but the most weather caution needed.
• October: Still warm and humid with lingering storm risk early, gradually drying out late in the month. An underrated value window.
• November: The wet season winds down; warm, increasingly dry, and pleasant, with hurricane season ending Nov 30. A sweet spot before the winter crowds.
• December: Drying out and cooling slightly; lovely weather as peak season ramps up around the holidays.

Whatever month you choose, our best time to visit guide weighs the weather against crowds and prices.

Humidity, sun, and what it actually feels like

Two things define the day-to-day feel of Key West weather: humidity and sun. Humidity stays high year-round (around 74–78%), which makes summer heat feel hotter and even pleasant winter days feel a touch sticky — though the near-constant sea breeze helps enormously. The sun is intense at this latitude in every season, so sunburn is a real risk even on cooler or cloudy winter days. The practical upshot: hydrate constantly, wear and reapply reef-safe sunscreen, seek shade midday (especially in summer), and lean on that ocean breeze. The water temperature is delightful nearly year-round, rarely dropping below the low 70s even in winter and warming to bathtub-like temps in summer, so swimming and snorkeling are on the table any time you visit.

How weather affects your activities

Key West’s weather shapes what you can do, so plan with it in mind. Water activities — snorkeling, sailing, the Dry Tortugas ferry, fishing — are best in calm, clear conditions, which means mornings and the drier winter and spring months offer the most reliable trips (rough seas or storms can cancel them). Beach and pool days are great year-round, though summer afternoons may be interrupted by storms. Sightseeing, museums, shopping, and the food-and-bar scene are all-weather and perfect for a rainy hour. The smart strategy in any season is to front-load weather-dependent activities into the morning (calmest water, best light, before afternoon storms build) and save indoor or flexible options for the afternoon. If you’re visiting specifically for the water — diving, fishing, sailing — lean toward the dry season and always build in a buffer day for weather. Our water sports guide and fishing seasons guide tie conditions to specific activities.

What to do if a storm hits your trip

Even a perfectly timed trip can catch a rainy day or a passing storm, so have a plan. For ordinary afternoon thunderstorms (common in summer), simply shift indoors — a museum, a long lunch, shopping, a spa, or a historic bar — and wait it out; they usually pass within an hour and often clear in time for sunset. For a named storm or hurricane threat during hurricane season, the priorities change: monitor official forecasts and local authorities closely, know your accommodation’s policies, and take any evacuation order seriously — leave early if one is issued, as the single highway out of the Keys can back up fast. This is exactly why travel insurance with weather coverage is wise for summer and fall trips. The good news is that serious storms are rare in any given week, and with awareness and flexibility you can enjoy the off-season’s deals and quiet with confidence. Don’t let hurricane season scare you off entirely — just travel prepared and stay informed.

What to pack for the weather

Key West’s climate calls for warm-weather, casual gear in every season: swimwear, shorts, sundresses, sandals, a hat, polarized sunglasses, and plenty of reef-safe sunscreen. Add a few specifics by season: in winter, pack a light jacket or sweater for cooler evenings and breezy boat rides; in summer and fall, bring a packable rain jacket or compact umbrella for those afternoon storms, plus extra sun protection. A light layer is useful year-round for restaurant AC and boats. Water shoes help on the rocky beaches, and a dry bag protects electronics on the water. Our full Key West packing list covers everything for any time of year.

So when is the weather best?

If perfect weather is your top priority, aim for late winter into spring (roughly March–May) — warm, dry, sunny, low humidity, and slightly thinner crowds than peak mid-winter. Winter (December–February) is also excellent and is the classic escape-the-cold season, though it’s the busiest and priciest. Summer and early fall bring heat, humidity, afternoon storms, and hurricane risk, but also the lowest prices, smallest crowds, and warmest water — a fine choice if you’re flexible and weather-aware. Late fall (November) is an underrated sweet spot as the wet season winds down. Match the season to your priorities — weather, budget, or crowds — using our best time to visit guide, and confirm your trip length with our how many days guide.

Water temperature and swimming

One of the best things about Key West’s climate is that the water is swimmable essentially year-round. Surrounded by the warm Gulf and Atlantic, sea temperatures rarely drop below the low 70s even in the depths of winter, and they warm to bathtub-like upper 80s in summer. That means snorkeling, diving, swimming, and watersports are on the menu in every season — in winter you might want a rash guard or light wetsuit for longer dives, but most people swim comfortably without one. Summer’s very warm water is wonderfully relaxing but can reduce water clarity slightly and, in the warmest stretches, bring occasional sea lice or jellyfish near shore. Winter and spring generally offer the clearest water for snorkeling and the calmest seas for boat trips, which is part of why the dry season is prime time for the reef and the Dry Tortugas. Whatever the month, the warm water is one of Key West’s great year-round gifts — see our snorkeling guide for the underwater conditions.

How Key West weather compares to mainland Florida

If you’re deciding between Key West and other Florida destinations, the weather is a real differentiator. Key West is warmer in winter than most of the mainland — while Miami and Orlando can get genuine cool snaps from passing cold fronts, Key West’s position at the southern tip and its ocean surroundings keep it consistently mild, which is exactly why it’s such a coveted winter escape. It also gets less total rainfall than mainland South Florida. In summer, it’s similarly hot and humid to the rest of the state, with the same afternoon-storm pattern, and it shares the same hurricane season. The big advantage is that winter reliability — if you want the warmest, most dependable cool-season weather in the continental U.S., Key West is hard to beat. We compare the destinations in full in our Key West vs. other Florida destinations guide.

Frequently asked questions

What is the weather like in Key West year-round?

Warm and tropical. Winter highs are in the upper 70s to low 80s; summer highs reach the upper 80s to low 90s. The temperature varies little year-round. The main seasonal difference is humidity and rain: a dry, pleasant winter and spring, and a humid, stormy summer and fall.

When is hurricane season in Key West?

The Atlantic hurricane season officially runs June 1 through November 30, with peak risk from mid-August through October (September is historically the stormiest). Direct hits in any given year are relatively rare, but if you travel then, buy travel insurance, monitor forecasts, and heed any official guidance or evacuation orders.

Does it rain a lot in Key West?

Key West gets about 39 inches of rain a year — less than mainland Florida. The wet season (May–October) brings the most, but usually as brief afternoon thunderstorms rather than all-day rain. Winter (December–February) is the driest. Mornings are often clear even in the rainy season.

Is it too hot to visit Key West in summer?

It’s hot and humid (upper 80s to low 90s with high humidity), but manageable if you plan around it — outdoor activities in the morning, shade and water midday, and a rain jacket for afternoon storms. Summer offers the warmest water, lowest prices, and smallest crowds, so many find it worth the heat.

What’s the best month for weather in Key West?

April and May are often the best — among the sunniest, driest, least humid months, with warm temperatures and slightly thinner crowds than mid-winter. The whole December-to-May dry season offers excellent weather.

Should I avoid Key West during hurricane season?

Not necessarily. While the official season runs June through November with peak risk in late summer and early fall, direct hits in any given week are relatively uncommon, and most off-season visitors experience nothing worse than the usual afternoon storms. The trade-off is real upside: lower prices, thinner crowds, and warm water. If you go, buy travel insurance with weather coverage, stay flexible, watch forecasts, and be ready to heed any official guidance. Plenty of travelers happily visit in summer and fall every year.

The takeaway

Key West’s weather is warm and inviting year-round, defined less by temperature than by two seasons: a dry, sunny winter and spring (the best weather, and peak season) and a humid, stormy summer and fall (cheaper and quieter, with afternoon showers and hurricane risk to watch). Pack for heat and sun in every season, add a rain jacket in summer, stay weather-aware during hurricane season, and you’ll enjoy the island whenever you visit — because honestly, there’s no genuinely bad time for Key West weather, only different flavors of warm — each with its own rhythm, light, and reasons to love the island. Plan your timing with our best time to visit guide and the full vacation planning guide.