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. Check more long-term weather averages for Key Largo in September before you book your next holiday to Florida in 2025/2026.

  • 32°C maximum daytime temperature in September in Key Largo32
    32°C max day temperature
  • 9 hours of sunshine per day
  • 17 days with some rainfall in September in Key Largo17
    17 days with some rainfall
  • 23°C minimum night-time temperature in September in Key Largo23
    23°C min night temperature
  • 12 hours of daylight per day in September in Key Largo12
    12 hours of daylight per day
  • Very high heat & humidity in September in Key LargoVH
    Very High heat & humidity
  • 213 mm monthly rainfall in September in Key Largo213
    213 mm of monthly rainfall
  • UV (maximum) index 10 (Very High) in September in Key Largo10
    10 (Very High) UV index
  • 29°C sea temperature in September in Key Largo29
    29°C sea temperature

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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)

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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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