Key West weather in August 2019

32
32°C max day temperature
10
10 hours of sunshine per day
15
15 days with some rainfall
26
26°C min night temperature
13
13 hours of daylight per day
VH
Very High heat & humidity
125
125 mm of monthly rainfall
11
11 (Extreme) UV index
30
30°C sea temperature

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

The August weather guide for Key West, Florida 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.

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

Guide to Key West weather in August

The average maximum daytime temperature in Key West in August is a hot 32°C (90°F) with very high heat & humidity. The average night-time temperature is usually a warm 26°C (79°F). There are usually 10 hours of bright sunshine each day, which represents 74% of the 13 hours of daylight.

Expect 125mm (4.9 inches) of rainfall across the whole of August with 15 days with some rain falling. Maximum UV levels will be extreme (11 UV index) at midday when the skies are clear.

The average sea temperature in and around Key West in August is 30°C (86°F).