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Key Largo weather in September 2025
Expect 32°C daytime maximum temperatures in the shade with on average 9 hours of sunshine per day in Key Largo in September based on long-term weather averages. There is usually 17 days with some rainfall and 213 mm of average monthly rainfall in September.
- 32°C max day temperature
32 - 9 hours of sunshine per day
- 17 days with some rainfall
17 - 23°C min night temperature
23 - 12 hours of daylight per day
12 - Very High heat & humidity
VH - 213 mm of monthly rainfall
213 - 10 (Very High) UV index
10 - 29°C sea temperature
29
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The September weather guide for Florida (Key Largo) 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)
More about Florida
How hot is it in Key Largo in September?
Daytime temperatures usually reach 32°C in Key Largo in September with very high heat and humidity, falling to 23°C at night.
How sunny is it in Key Largo in September?
There are normally 9 hours of bright sunshine each day in Key Largo in September - that's 69% of daylight hours.
How warm is the sea around Key Largo in September?
The average sea temperature around Key Largo in September is 29°C.
Does it rain in Key Largo in September?
There are usually 17 days with some rain in Key Largo in September and the average monthly rainfall is 213mm.
What is the chance of a hurricane in Key Largo in September?
On average less than 1 day in September in Key Largo is likely to be affected by the passage of one or more tropical storms.
Key Largo September sunrise & sunset times
Browse the sunrise and sunset times for Key Largo in September 2025. Select a month to view Key Largo sunrise and sunset times for the next 12 months.
JanFebMarAprMayJunJulAugSepOctNovDec
| Date | Sunrise times | Sunset times |
|---|---|---|
| Monday, 1st September 2025 | 06:03 | 18:40 |
| Monday, 15th September 2025 | 06:08 | 18:25 |
| Tuesday, 30th September 2025 | 06:14 | 18:09 |
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