Key West, Florida Weather by Month
Key West has a warm, tropical climate throughout the year, with mild winters, hot summers, and a wetter season from late spring through fall. Based on the supplied data, July and August are the hottest months, with average highs of 32°C (90°F), while January is the coolest month at 75°F (24°C). September is the wettest month, receiving about 7.4 inches of rainfall and 12 rainy days.
Key West also has relatively consistent daylight throughout the year, ranging from about 10.5 hours in December to 13.5 hours from May through July.
Key West, Florida Weather by Month
You can click the image below to view the full-size weather chart for Key West, FL.
January – Mild Winter Weather
Average high: 75°F (24°C)
Average low: 64°F (18°C)
Rainfall: 1.76 inches
Rainy days: 4
Snowfall: 0 inches
Daylight: 11 hours
January is one of the coolest months in Key West, but temperatures remain mild compared with most of the United States. Average daytime temperatures reach about 75°F, while nighttime temperatures fall to around 64°F.
Rainfall is relatively low at about 1.76 inches, with approximately 4 rainy days. Snow is not a factor in Key West, making January an attractive month for visitors looking for warm-weather activities.
Best for:
- Winter escapes
- Outdoor sightseeing
- Beach activities
- Walking tours
February – Mild and Pleasant Weather
Average high: 79°F (26°C)
Average low: 68°F (20°C)
Rainfall: 1.96 inches
Rainy days: 3
Snowfall: 0 inches
Daylight: 11.5 hours
February brings slightly warmer temperatures to Key West. Average highs reach 79°F, while lows remain comfortable around 68°F. With only about 1.96 inches of rainfall and 3 rainy days, February is one of the drier months.
Daylight increases to about 11.5 hours, giving visitors plenty of time to explore the island and enjoy outdoor activities.
Best for:
- Beach trips
- Water sports
- Outdoor dining
- Island sightseeing
March – Warm and Dry Spring Weather
Average high: 81°F (27°C)
Average low: 70°F (21°C)
Rainfall: 1.22 inches
Rainy days: 3
Snowfall: 0 inches
Daylight: 12 hours
March is warm and relatively dry in Key West. Average high temperatures reach 81°F, while nighttime lows average around 70°F. Rainfall drops to just 1.22 inches, making March one of the driest months in the supplied data.
With 12 hours of daylight, March provides excellent conditions for exploring Key West, boating, snorkeling, and enjoying the beaches.
Best for:
- Snorkeling
- Boating
- Beach days
- Sightseeing
April – Warm and Comfortable Weather
Average high: 84°F (29°C)
Average low: 73°F (23°C)
Rainfall: 2.09 inches
Rainy days: 3
Snowfall: 0 inches
Daylight: 12.5 hours
April brings warmer temperatures, with average highs of 84°F and lows around 73°F. Rainfall increases slightly to about 2.09 inches, but there are still only around 3 rainy days.
The longer 12.5 hours of daylight make April a great month for spending time outdoors and enjoying Key West’s beaches and attractions.
Best for:
- Beach vacations
- Cycling
- Fishing
- Sunset cruises
May – Hot and Increasingly Wet Weather
Average high: 86°F (30°C)
Average low: 75°F (24°C)
Rainfall: 3.59 inches
Rainy days: 5
Snowfall: 0 inches
Daylight: 13.5 hours
May marks the beginning of noticeably hotter and wetter weather in Key West. Average highs reach 86°F, while nighttime temperatures stay around 75°F.
Rainfall rises to about 3.59 inches, with approximately 5 rainy days. However, May also has about 13.5 hours of daylight, providing plenty of time for outdoor activities.
Best for:
- Water activities
- Diving
- Fishing
- Long beach days
June – Hot and Humid Summer Weather
Average high: 88°F (31°C)
Average low: 77°F (25°C)
Rainfall: 4.34 inches
Rainy days: 7
Snowfall: 0 inches
Daylight: 13.5 hours
June is hot in Key West, with average daytime temperatures around 88°F and nighttime lows near 77°F. Rainfall increases to approximately 4.34 inches, and there are about 7 rainy days.
Despite the wetter conditions, June offers some of the longest daylight of the year at around 13.5 hours.
Best for:
- Diving
- Snorkeling
- Boating
- Early-morning beach activities
July – Hottest Month of the Year
Average high: 90°F (32°C)
Average low: 79°F (26°C)
Rainfall: 4.90 inches
Rainy days: 9
Snowfall: 0 inches
Daylight: 13.5 hours
July is one of the hottest months in Key West, with an average high of 90°F and an average low of 79°F. Rainfall reaches about 4.90 inches, and the supplied data shows around 9 rainy days.
The combination of high temperatures and humidity can make afternoons feel very hot, so visitors may prefer water activities or outdoor sightseeing earlier in the day.
Best for:
- Swimming
- Snorkeling
- Diving
- Water sports
August – Hot and Very Wet Summer Weather
Average high: 90°F (32°C)
Average low: 79°F (26°C)
Rainfall: 5.54 inches
Rainy days: 10
Snowfall: 0 inches
Daylight: 13 hours
August remains extremely warm, with average highs of 90°F and lows around 79°F. Rainfall increases to approximately 5.54 inches, while about 10 days receive rain.
The 13 hours of daylight still provide plenty of time for exploring, although the heat and frequent showers make flexible plans useful.
Best for:
- Swimming
- Diving
- Indoor attractions
- Short outdoor excursions
September – Wettest Month in Key West
Average high: 88°F (31°C)
Average low: 77°F (25°C)
Rainfall: 7.40 inches
Rainy days: 12
Snowfall: 0 inches
Daylight: 12.5 hours
September is the wettest month in the supplied Key West data. The city averages about 7.40 inches of rainfall and 12 rainy days. Temperatures remain hot, with highs around 88°F and lows near 77°F.
Visitors should be prepared for frequent rain showers and keep flexible schedules. Despite the wetter conditions, September remains warm enough for swimming and other water activities.
Best for:
- Swimming
- Diving
- Indoor attractions
- Flexible tropical getaways
October – Warm Weather with Heavy Rainfall
Average high: 86°F (30°C)
Average low: 75°F (24°C)
Rainfall: 5.72 inches
Rainy days: 8
Snowfall: 0 inches
Daylight: 11.5 hours
October brings slightly cooler temperatures, with average highs of 86°F and lows around 75°F. Rainfall remains relatively high at about 5.72 inches, although there are fewer rainy days than in September.
With 11.5 hours of daylight, October still offers good opportunities for sightseeing and outdoor activities between rain showers.
Best for:
- Fishing
- Water sports
- Sightseeing
- Tropical vacations
November – Warm and Drier Fall Weather
Average high: 81°F (27°C)
Average low: 72°F (22°C)
Rainfall: 2.61 inches
Rainy days: 4
Snowfall: 0 inches
Daylight: 11 hours
November marks a return to drier and more comfortable weather. Average highs reach 81°F, while nighttime temperatures fall to around 72°F.
Rainfall drops significantly to approximately 2.61 inches, with only about 4 rainy days. These conditions make November an excellent month for outdoor exploration.
Best for:
- Sightseeing
- Boating
- Fishing
- Beach vacations
December – Mild and Dry Winter Weather
Average high: 79°F (26°C)
Average low: 68°F (20°C)
Rainfall: 2.46 inches
Rainy days: 4
Snowfall: 0 inches
Daylight: 10.5 hours
December is mild and relatively dry in Key West. Average daytime temperatures are around 79°F, while nighttime lows average 68°F.
Rainfall is about 2.46 inches, with approximately 4 rainy days. December has the shortest daylight of the year at around 10.5 hours, but the weather remains warm enough for outdoor activities and beach visits.
Best for:
- Winter vacations
- Beach activities
- Holiday travel
- Outdoor dining
Key West Weather by Month: Quick Comparison
| Month | Avg High | Avg Low | Rainfall | Rainy Days | Daylight |
|---|---|---|---|---|---|
| January | 75°F | 64°F | 1.76 in | 4 | 11 hrs |
| February | 79°F | 68°F | 1.96 in | 3 | 11.5 hrs |
| March | 81°F | 70°F | 1.22 in | 3 | 12 hrs |
| April | 84°F | 73°F | 2.09 in | 3 | 12.5 hrs |
| May | 86°F | 75°F | 3.59 in | 5 | 13.5 hrs |
| June | 88°F | 77°F | 4.34 in | 7 | 13.5 hrs |
| July | 90°F | 79°F | 4.90 in | 9 | 13.5 hrs |
| August | 90°F | 79°F | 5.54 in | 10 | 13 hrs |
| September | 88°F | 77°F | 7.40 in | 12 | 12.5 hrs |
| October | 86°F | 75°F | 5.72 in | 8 | 11.5 hrs |
| November | 81°F | 72°F | 2.61 in | 4 | 11 hrs |
| December | 79°F | 68°F | 2.46 in | 4 | 10.5 hrs |
Best Time to Visit Key West
For warm temperatures with less rainfall, March and April stand out as particularly favorable months in the supplied data. December through April generally offers drier and more comfortable conditions, while May through October is hotter and wetter.
September is the wettest month, while July and August are the hottest. If your priority is beach and water activities, the warm summer months can still be appealing, but visitors should be prepared for frequent rain showers.
20 FAQs About Key West Weather
1. What is the weather like in Key West?
Key West has a warm tropical climate throughout the year. Winters are mild and relatively dry, while summers are hot, humid, and wetter.
2. What is the coldest month in Key West?
January is the coolest month in the supplied data, with an average high of 75°F and an average low of 64°F.
3. What is the hottest month in Key West?
July and August are the hottest months, with average highs of about 90°F and average lows of 79°F.
4. Does Key West get snow?
No. Snowfall is essentially 0 inches in Key West. Snow is extremely unlikely because of the island’s warm tropical climate.
5. What is the best month to visit Key West for good weather?
March and April are excellent choices for pleasant weather. Temperatures are warm, rainfall is relatively low, and there is plenty of daylight.
6. What is the rainiest month in Key West?
September is the wettest month in the supplied data, with approximately 7.40 inches of rainfall and 12 rainy days.
7. Does it rain a lot in Key West?
Rainfall varies considerably by season. The drier months are generally in winter and early spring, while May through October tends to be wetter, with September receiving the most rainfall.
8. What is the average temperature in Key West in January?
January has an average high of 75°F and an average low of 64°F, making it one of the most comfortable months for outdoor activities.
9. What is Key West weather like in February?
February is mild and relatively dry, with an average high of 79°F, an average low of 68°F, and about 1.96 inches of rainfall.
10. Is March a good time to visit Key West?
Yes. March is warm and relatively dry, with an average high of 81°F, about 1.22 inches of rainfall, and approximately 12 hours of daylight.
11. Is Key West hot in April?
Yes, April is warm but generally comfortable. Average temperatures reach around 84°F during the day and fall to about 73°F at night.
12. How hot is Key West in summer?
Summer is hot, with average highs ranging from 88°F to 90°F from June through September. Nighttime temperatures generally remain between 77°F and 79°F.
13. Is Key West humid in the summer?
Yes. Summer is generally hot and humid, and rainfall becomes more frequent. Visitors should stay hydrated and plan outdoor activities around the hottest part of the day.
14. What is Key West weather like in September?
September is hot and very wet. The average high is about 88°F, the low is around 77°F, and rainfall reaches approximately 7.40 inches.
15. Is October a good time to visit Key West?
October can be a good time to visit if you don’t mind occasional rain. Temperatures remain warm, with an average high of 86°F, although rainfall is still relatively high.
16. What is Key West weather like in November?
November brings warmer, drier, and more comfortable weather. Average highs are around 81°F, with approximately 2.61 inches of rainfall and 4 rainy days.
17. Is Key West warm in December?
Yes. December remains mild and warm compared with most U.S. destinations, with an average high of 79°F and an average low of 68°F.
18. Which month has the most daylight in Key West?
May, June, and July have the longest daylight in the supplied data, at approximately 13.5 hours per day.
19. When is the rainy season in Key West?
The wetter period is generally from late spring through fall, with rainfall increasing from May and reaching its highest level in September.
20. What is the best time of year for a Key West beach vacation?
For a combination of warm temperatures and relatively lower rainfall, March and April are among the best choices. December through April also generally offers comfortable conditions for beaches, sightseeing, boating, and other outdoor activities.
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