Key West weather in August 2025

Expect daytime maximum temperatures of 32°C in Key West, Florida in August and very high heat and humidity based on long-term weather averages. There are 10 hours of sunshine per day on average with 15 days with some rainfall and typically 125 mm of rainfall in the month.

  • 32°C maximum daytime temperature in August in Key West32
    32°C max day temperature
  • 10 hours of sunshine per day
  • 15 days with some rainfall in August in Key West15
    15 days with some rainfall
  • 26°C minimum night-time temperature in August in Key West26
    26°C min night temperature
  • 13 hours of daylight per day in August in Key West13
    13 hours of daylight per day
  • Very high heat & humidity in August in Key WestVH
    Very High heat & humidity
  • 125 mm monthly rainfall in August in Key West125
    125 mm of monthly rainfall
  • UV (maximum) index 11 (Extreme) in August in Key West11
    11 (Extreme) UV index
  • 30°C sea temperature in August in Key West30
    30°C sea temperature

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The August 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 August?

Daytime temperatures usually reach 32°C in Key West in August with very high heat and humidity, falling to 26°C at night.

How sunny is it in Key West in August?

There are normally 10 hours of bright sunshine each day in Key West in August - that's 74% of daylight hours.

How warm is the sea around Key West in August?

The average sea temperature around Key West in August is 30°C.

Does it rain in Key West in August?

There are usually 15 days with some rain in Key West in August and the average monthly rainfall is 125mm.

What is the chance of a hurricane in Key West in August?

On average less than 1 day in August in Key West is likely to be affected by the passage of one or more tropical storms.

Key West August sunrise & sunset times

Browse the sunrise and sunset times for Key West in August 2025. Select a month to view Key West sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Friday, 1st August 2025 05:56 19:11
Saturday, 16th August 2025 06:02 19:00
Sunday, 31st August 2025 06:08 18:46

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