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Key West weather in September 2021
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- 3131°C max day temperature
- 1515 days with some rainfall
- 2525°C min night temperature
- 1212 hours of daylight per day
- VHVery High heat & humidity
- 166166 mm of monthly rainfall
- 1010 (Very High) UV index
- 2929°C sea temperature
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The September 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.
How hot is it in Key West in September?
Daytime temperatures usually reach 31°C in Key West in September with very high heat and humidity, falling to 25°C at night.
How sunny is it in Key West in September?
There are normally 9 hours of bright sunshine each day in Key West in September - that's 73% of daylight hours.
How warm is the sea around Key West in September?
The average sea temperature around Key West in September is 29°C.
Does it rain in Key West in September?
There are usually 15 days with some rain in Key West in September and the average monthly rainfall is 166mm.
What is the chance of a hurricane in Key West in September?
On average less than 1 day in September in Key West is likely to be affected by the passage of one or more tropical storms.
Metric (°C / mm) | Imperial (°F / inches)
Key West sunrise & sunset times for September 2021
Browse the sunrise and sunset times for Key West in September 2021. Select a month to view Key West sunrise & sunset times for the next 12 months.
|Date||Sunrise times||Sunset times|
|Wednesday, 1st September 2021||07:08||19:45|
|Wednesday, 15th September 2021||07:13||19:31|
|Thursday, 30th September 2021||07:19||19:15|
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