Key West weather in August 2025

Q: 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.

Q: 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.

Q: How warm is the sea around Key West in August?

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

Q: 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.

Q: What is the chance of a cyclone 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.

Expect 90°F daytime maximum temperatures in the shade with on average 10 hours of sunshine per day in Key West in August. Check more long-term weather averages for Key West in August before you book your next holiday to Florida in 2025/2026.

90
90°F max day temperature
10
10 hours of sunshine per day
15
15 days with some rainfall
79
79°F min night temperature
13
13 hours of daylight per day
VH
Very High heat & humidity
4.9
4.9 inches of monthly rainfall
11
11 (Extreme) UV index
86
86°F sea temperature

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Destination

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) | Imperial (°F)

More about Florida

How hot is it in Key West in August?

Daytime temperatures usually reach 90°F in Key West in August with very high heat and humidity, falling to 79°F 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 86°F.

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 4.9 inches.

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.

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

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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Florida - quick facts
Flight time^✝	9.5 hours
Time difference	UK -5 to -6 hours
Language(s)	English
Currency	US Dollar
Electricity	A + B plug (120V)
Driving side	Right
Visa^✝	Yes
Why visit?	Beaches Culture Nature Nightlife
Tourist info	Visit Florida