Key West weather in May 2026

Expect daytime maximum temperatures of 29°C in Key West, Florida in May and high heat and humidity based on long-term weather averages. There are 11 hours of sunshine per day on average with typically 107 mm of rainfall in the month.

  • 29°C maximum daytime temperature in May in Key West29
    29°C max day temperature
  • 11 hours of sunshine per day
  • 8 days with some rainfall in May in Key West8
    8 days with some rainfall
  • 23°C minimum night-time temperature in May in Key West23
    23°C min night temperature
  • 13 hours of daylight per day in May in Key West13
    13 hours of daylight per day
  • High heat & humidity in May in Key WestH
    High heat & humidity
  • 107 mm monthly rainfall in May in Key West107
    107 mm of monthly rainfall
  • UV (maximum) index 11 (Extreme) in May in Key West11
    11 (Extreme) UV index
  • 27°C sea temperature in May in Key West27
    27°C sea temperature

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The May weather guide for Florida (Key West) shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

Metric (°C / mm)  |  Imperial (°F / inches)

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More about Florida

How hot is it in Key West in May?

Daytime temperatures usually reach 29°C in Key West in May with high heat and humidity, falling to 23°C at night.

How sunny is it in Key West in May?

There are normally 11 hours of bright sunshine each day in Key West in May - that's 79% of daylight hours.

How warm is the sea around Key West in May?

The average sea temperature around Key West in May is 27°C.

Does it rain in Key West in May?

There are usually 8 days with some rain in Key West in May and the average monthly rainfall is 107mm.

Key West May sunrise & sunset times

Browse the sunrise and sunset times for Key West in May 2026. Select a month to view Key West sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Friday, 1st May 2026 05:52 18:57
Saturday, 16th May 2026 05:43 19:04
Sunday, 31st May 2026 05:38 19:12

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