Key West Weather in May
May in Key West sees daytime temperatures around 30°C (86°F) and lows of 25°C (77°F) at night. With around 63 mm (2.5 in) of rainfall expected, it's worth packing a rain jacket.
Rainfall in Key West in May
This month experiences about 9 days of rain according to historical data, averaging 63 mm (2.5 in). Expect a fairly normal spread of rainfall this month, with no particular pattern of very heavy or very persistent showers.
Temperature in Key West in May
Expect highs of 30°C (86°F) in Key West in May, with nights dropping to around 25°C (77°F). This kind of day-to-night contrast is typical for this time of year. Nights stay warm at around 25°C (77°F), so light bedding and good ventilation are worth thinking about.
Sunshine in Key West in May
Expect a lot of sunshine this month, with about 341 hours of sun. These sunny conditions add to the overall experience.
Average water temperature in May
With water at 27°C (81°F), you can expect warm, pleasant conditions for any water activity. There's no adjustment period — it feels comfortable straight away.If you prefer enjoying temperate temperatures and rain-free days, January, February, March, April, November and December typically offer the best circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit the United States of America, check out our Key West's climate page.
Key West Temperature in May
Min Temperature
25°C (77°F)
Max Temperature
30°C (86°F)
Water Temperature
27°C (81°F)
Chance of Rain
31%
Precipitation
63 mm (2.5 in)
Rainy days
9 days
Humidity
72%
Sunshine
341 hours
Percentage Sunshine
82%
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Key West typically stay consistent throughout May, with daily highs averaging around 30°C (86°F). Nights are warm, with lows typically ranging from 24°C (75°F) to 26°C (79°F).
Average temperatures in May
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in May
Historical weather for Key West in May
Browse day-by-day weather records for Key West spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Key West historical weather extremes in May
Based on 50 years of weather observations (1976-2026), these are the most extreme conditions recorded in Key West.
- The hottest May day on record in Key West reached 33°C (91°F) (May 29, 2024).
- The lowest daytime temperature in May was 24°C (75°F), recorded on May 8, 1992.
- Nighttime temperatures dropped to 18°C (64°F) on May 9, 1992, marking the coldest May night on record.
Best Places in the United States of America in May
Find out more about the weather in the United States of America and which places have the best travel conditions in this month. See all of the United States of America in May →
perfect weather
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What to Wear in Key West in May
Warm but pleasant conditions in Key West in May. Focus on lightweight, maybe with natural fabrics, cotton blend shirts, comfortable shorts, and breathable footwear. A light cover-up for sun protection is smart too. Wet weather is likely, so pack waterproof gear for multiple rainy days. The water temperature sits at about 27°C (81°F), making it perfect for swimming and water activities. Don't forget to pack your favorite swimwear and perhaps some snorkel gear. You'll definitely want to pack sunglasses and sunscreen. There will be plenty of bright sunshine this month.What To Do in Key West in May
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit the United States of America, check out our Key West's climate page.
Temperature Rainfall Sunshine Humidity Water Temp
See the full Key West climate overview or explore weather in the United States of America.
