The weather in Sanibel in September is very hot. The average temperatures are between 26°C and 31°C, drinking water regularly is advisable.
There’s going to be many days of rain during the month of September in Sanibel.
Sanibel should expect an average of 15 to 22 days of rain, so be sure to bring along a waterproof jacket to stay dry this month!
Our weather forecast can give you a great sense of what weather to expect in Sanibel in September 2025.
If you’re planning to visit Sanibel in the near future, we highly recommend that you review the 14 day weather forecast for Sanibel before you arrive.
Temperatures
31° / 26°
Rainy Days
15
Snowy Days
0
Dry Days
15
Rainfall
389
mm
Sun Hours
11.5
Hrs
