Key West has warm weather throughout the year, but choosing the right month can make a noticeable difference to your vacation. Winter and early spring bring some of the most comfortable weather, with warm days, lower rainfall and cooler evenings. Summer is hotter and more humid, but the ocean is exceptionally warm and the island can feel different from the busy winter season. Late summer and early fall require more flexibility because they fall within the wetter part of the year and the Atlantic hurricane season. For many first-time visitors, March and April provide an excellent combination of warm weather, relatively low rainfall and comfortable conditions for exploring the island. But there is no single perfect month for everyone. The best time depends on whether your priorities are weather, swimming, smaller crowds, prices or avoiding the wetter months.
When Is the Best Time to Visit Key West?
For many travelers, the most comfortable period to visit Key West is from February through April. These months fall within the generally drier part of the year and provide warm temperatures without the persistent summer heat and humidity. March is particularly attractive for weather. Average daytime highs are around 80°F, while average rainfall is only about 1.5 inches. April becomes warmer, with average highs around 83°F, and the ocean is warmer as well. The tradeoff is that pleasant winter and spring weather attracts visitors. If your priority is a quieter trip rather than the driest possible conditions, May and November can be interesting alternatives. Both sit around the transition between Key West’s main dry and wet seasons.
Key West Weather at a Glance
| Month | Avg. High | Avg. Low | Rainfall |
|---|---|---|---|
| January | 76°F | 66°F | 1.83 in |
| February | 77°F | 67°F | 1.54 in |
| March | 80°F | 69°F | 1.53 in |
| April | 83°F | 73°F | 2.07 in |
| May | 86°F | 76°F | 3.12 in |
| June | 89°F | 79°F | 4.23 in |
| July | 90°F | 81°F | 3.63 in |
| August | 91°F | 81°F | 5.37 in |
| September | 89°F | 79°F | 7.24 in |
| October | 86°F | 77°F | 5.67 in |
| November | 81°F | 72°F | 2.05 in |
| December | 78°F | 68°F | 2.16 in |
These figures are long-term climate averages rather than a forecast for a particular vacation. Actual conditions can vary from year to year and from day to day.
Key West Seasons Explained
Key West does not experience four seasons in the same way as much of the continental United States. It is more useful to think in terms of a drier season and a wetter season. December through April is generally the dry season. These months account for a relatively small portion of the area’s annual rainfall and usually bring comfortable conditions for walking, sightseeing and spending time outdoors. May and November are transition months. June through October is the wetter part of the year, when showers and thunderstorms become more common. That does not mean it rains all day throughout summer. Tropical showers can be brief and localized, and plenty of sunny weather can occur between them.
January
January offers some of Key West’s coolest and driest weather. An average high around 76°F makes daytime sightseeing comfortable, especially if you plan to spend plenty of time walking through Old Town. Evenings can feel noticeably cooler, with average lows around 66°F. Ocean temperatures are also cooler than later in the year, so travelers focused primarily on long swimming and snorkeling days may prefer spring. For sightseeing, however, January is an excellent month. The main disadvantage is demand. Winter is an attractive escape for visitors coming from colder parts of the country, so do not assume January will be a quiet bargain period.
February
February continues the dry and comfortable winter pattern. Average highs are around 77°F, while rainfall is among the lowest of the year. This makes February particularly good for exploring Key West on foot, cycling, eating outdoors and spending long periods outside without peak-summer heat. Water temperatures average around 70°F, which may feel cool to some swimmers. For travelers primarily interested in sightseeing rather than spending every day in the water, February is one of the strongest choices of the year.
March
March is one of the easiest months to recommend for a first Key West vacation. Average highs reach around 80°F while rainfall remains very low. The ocean also begins warming, with average water temperatures around 75°F. That combination makes March useful for travelers who want both sightseeing and time near the water.
The downside is that favorable weather can attract plenty of visitors. If your schedule is flexible, compare several weeks rather than assuming every part of March will have the same demand or accommodation prices.
April
April may offer one of the best balances of the year. Average daytime temperatures climb to around 83°F, average rainfall remains relatively low, and water temperatures rise to around 79°F. That makes the month attractive for swimming, snorkeling, sightseeing and spending evenings outdoors. The stronger heat and rainfall of summer have not fully arrived yet. For visitors who find winter ocean temperatures too cool, April can be more appealing than January or February. It is one of the strongest all-around choices for a first visit.
May
May is a transition month. Average highs rise to around 86°F and the ocean reaches roughly 83°F. For swimming and other water-based activities, those conditions are excellent. Rainfall begins increasing compared with winter and early spring, and humidity becomes more noticeable.
May can be an interesting compromise if you want genuinely tropical weather but do not specifically need the driest conditions of February through April. Pack for heat and occasional showers rather than expecting winter-style weather.
June
June marks the beginning of the official Atlantic hurricane season and falls within Key West’s wetter season. Average highs are close to 89°F and average lows remain around 79°F. The ocean is very warm, averaging roughly 86°F. For visitors who enjoy warm-water activities, summer has obvious advantages. The tradeoff is heat, humidity and a greater likelihood of showers and thunderstorms. Plan outdoor sightseeing for cooler parts of the day when practical and leave some flexibility in your schedule.
July
July is hot. Average daytime highs reach around 90°F, and nights remain warm at around 81°F. Water temperatures average roughly 87°F, making the sea feel exceptionally warm. This can be a good month for travelers whose main priorities are water activities and a tropical summer atmosphere. For long walking days through Old Town, however, the combination of heat and humidity can be tiring. Build breaks into the middle of the day rather than planning nonstop outdoor sightseeing.
August
August is one of the hottest months in Key West. Average highs are around 91°F, and average water temperatures remain near 87°F. Rainfall also becomes more significant. August falls within the period when tropical weather deserves closer attention, particularly as the Atlantic season becomes more active later in summer.
That does not mean a trip should automatically be avoided. Many summer days still include sunshine and good conditions. It simply means travelers should have more flexibility than they would during the winter dry season.
September
September requires the most weather flexibility. It is Key West’s wettest month based on long-term climate normals, with average rainfall above seven inches. Temperatures remain hot, with average highs around 89°F. September also falls close to the climatological peak of Atlantic hurricane activity. For travelers willing to accept weather uncertainty, September can still offer warm water and periods of beautiful tropical weather. But this is not the month to choose if minimizing weather risk is your main priority. Flexible travel arrangements become particularly valuable.
October
October remains warm, with average highs around 86°F and water temperatures around 82°F. Rainfall is still relatively high compared with winter and spring. The month also remains within hurricane season. Later in October, conditions begin moving toward the drier part of the year, but individual years can vary significantly. October can work well for travelers who want warm weather and do not mind building flexibility into their plans. Always check current tropical weather information as the trip approaches.
November
November is one of the most interesting transition months. Average highs drop to around 81°F and average rainfall falls substantially compared with September and October. The official Atlantic hurricane season continues through November 30, but climatological tropical cyclone activity is much lower late in the season than around its September peak.
For sightseeing, November can be very comfortable. The weather is warm without the intensity of midsummer, and rainfall averages are much closer to winter levels. It can be an excellent month for travelers who want warm Florida weather without choosing the middle of the winter season.
December
December brings Key West back into its drier season. Average highs are around 78°F, average lows around 68°F and rainfall averages a little over two inches. The ocean averages around 72°F. For visitors escaping genuinely cold winter weather elsewhere, those conditions can feel ideal. December works especially well for walking, sightseeing and spending time outdoors. Holiday periods can affect demand, however, so travelers focused on accommodation value should compare dates carefully.
Best Time for Good Weather
If comfortable weather is your main priority, February through April is the strongest period to consider. Rainfall is relatively low, daytime temperatures are warm and the most humid part of summer has not arrived. March provides a particularly attractive balance. April is warmer and has warmer ocean temperatures, making it useful if you want sightseeing and swimming in the same trip. January and December are also pleasant but can feel cooler, particularly in the evenings and in the water.
Best Time for Beaches & Swimming
For warm ocean water, late spring through early fall has a clear advantage. Average water temperatures rise from around 79°F in April to 83°F in May and reach approximately 86–87°F during summer. September remains extremely warm at around 86°F before temperatures begin dropping through fall.
The warmest water does not necessarily mean the best overall weather. Summer also brings higher humidity, more rainfall and greater tropical weather risk. April and May provide a useful compromise for travelers who want warm water without choosing the heart of summer.
Best Time for Fewer Crowds
Key West’s most comfortable winter weather naturally attracts visitors. If smaller crowds are important, look beyond the traditional winter escape period. Late spring and portions of summer can feel different from peak winter travel periods, while September can also be quieter because of heat, rain and tropical weather uncertainty. However, crowd patterns are not determined by weather alone. Festivals, holidays, weekends, cruise schedules and special events can dramatically change how busy Old Town feels. Rather than choosing a month based only on general crowd patterns, check what is happening during your exact dates.
Best Time for Lower Prices
Accommodation prices in Key West can vary considerably by date. Periods with less favorable weather often create better opportunities than the busiest winter weeks, but there is no single month that is guaranteed to be inexpensive. Summer and early fall are worth comparing if budget matters and you are comfortable with heat and weather uncertainty. May can also provide an interesting compromise between spring conditions and summer. Do not choose solely according to the average nightly rate. A cheaper hotel during a period with greater weather uncertainty may not represent better value for every traveler. Compare several sets of dates before booking.
Hurricane Season in Key West
The official Atlantic hurricane season runs from June 1 through November 30. That does not mean Key West experiences a hurricane every year or that every day during those six months is stormy. The risk changes significantly throughout the season. Historically, Atlantic tropical cyclone activity reaches its climatological peak around September 10, with most activity occurring from roughly mid-August through mid-October.
If you visit during hurricane season, especially from late summer into early fall, flexibility is important. Check official forecasts as your travel date approaches and pay attention to local guidance if tropical weather threatens the Florida Keys. Do not make decisions based on long-range hurricane predictions for a specific vacation week months in advance. Weather systems and their tracks become much more meaningful closer to the actual dates.
How Many Days Do You Need?
Two days can cover the main Key West highlights, but three days provides a much better pace for most first-time visitors. With three days, you can explore Old Town, spend time around the waterfront, enjoy sunset without rushing and dedicate part of the trip to the water or another island activity. Four days works well if you want a slower vacation with more beach or pool time. If Key West is part of a Florida Keys road trip, avoid treating it as only a few hours at the end of the Overseas Highway. The journey through the Keys is part of the experience, but Key West itself deserves enough time to enjoy without immediately turning around and driving back.
FAQ About Visiting Key West
What is the best month to visit Key West?
March and April offer an excellent balance for many first-time visitors. Both have warm daytime temperatures and relatively low rainfall, while April also brings warmer ocean temperatures. February is another strong choice if comfortable sightseeing weather matters more than warm water.
What is the rainy season in Key West?
June through October is generally considered the wetter season in the Florida Keys. May and November are transition months, while December through April is the drier period.
When is hurricane season in Key West?
Atlantic hurricane season officially runs from June 1 through November 30. Tropical cyclone activity is historically highest around late August, September and early October, although conditions vary considerably from year to year.
Is Key West warm in winter?
Yes. Average daytime highs are around 76°F in January, 77°F in February and 78°F in December. Evenings can be cooler, and winter ocean temperatures are noticeably lower than during late spring and summer.
When is the water warmest in Key West?
The ocean is warmest during summer. Average water temperatures reach about 87°F in July and August and remain around 86°F in September. May through October generally provides very warm water.
Is summer a good time to visit Key West?
Summer can work well if you enjoy very warm weather and warm ocean temperatures. Expect higher humidity, more frequent showers and the need for greater weather flexibility than during the winter and early spring dry season.
Recommended Next Steps
For a first trip focused on comfortable weather, start by comparing dates from February through April. Choose March if you want warm days and very low average rainfall. Choose April if warmer ocean temperatures are an important part of the trip. Consider May if you want more tropical warmth and are comfortable with increasing humidity and occasional rain. November is another interesting option because temperatures become more comfortable and average rainfall drops considerably from September and October. Summer works better for travelers who prioritize warm water and can handle heat, humidity and changing weather. If you travel from June through November, pay closer attention to tropical forecasts as your departure date approaches, particularly from mid-August through mid-October. Whatever month you choose, avoid building your entire decision around weather alone. Think about what you actually want to do in Key West. The ideal month for walking around Old Town all day is not necessarily the same month you would choose for the warmest possible ocean. For many first-time visitors looking for the strongest overall balance, March and April are excellent places to start.