Sanibel Island weather in September 2025

Expect 32°C daytime maximum temperatures in the shade with on average 8 hours of sunshine per day in Sanibel Island in September. Check more long-term weather averages for Sanibel Island in September before you book your next holiday to Florida in 2025/2026.

  • 32°C maximum daytime temperature in September in Sanibel Island32
    32°C max day temperature
  • 8 hours of sunshine per day
  • 14 days with some rainfall in September in Sanibel Island14
    14 days with some rainfall
  • 23°C minimum night-time temperature in September in Sanibel Island23
    23°C min night temperature
  • 12 hours of daylight per day in September in Sanibel Island12
    12 hours of daylight per day
  • Very high heat & humidity in September in Sanibel IslandVH
    Very High heat & humidity
  • 198 mm monthly rainfall in September in Sanibel Island198
    198 mm of monthly rainfall
  • UV (maximum) index 10 (Very High) in September in Sanibel Island10
    10 (Very High) UV index
  • 29°C sea temperature in September in Sanibel Island29
    29°C sea temperature

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The September weather guide for Florida (Sanibel Island) 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 Sanibel Island in September?

Daytime temperatures usually reach 32°C in Sanibel Island in September with very high heat and humidity, falling to 23°C at night.

How sunny is it in Sanibel Island in September?

There are normally 8 hours of bright sunshine each day in Sanibel Island in September - that's 67% of daylight hours.

How warm is the sea around Sanibel Island in September?

The average sea temperature around Sanibel Island in September is 29°C.

Does it rain in Sanibel Island in September?

There are usually 14 days with some rain in Sanibel Island in September and the average monthly rainfall is 198mm.

What is the chance of a hurricane in Sanibel Island in September?

On average 1.1 days in September in Sanibel Island are likely to be affected by the passage of one or more tropical storms.

Sanibel Island September sunrise & sunset times

Browse the sunrise and sunset times for Sanibel Island in September 2025. Select a month to view Sanibel Island sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 06:08 18:48
Monday, 15th September 2025 06:14 18:32
Tuesday, 30th September 2025 06:20 18:15

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