The highest day temperature in September 2023 was 96°F. The lowest night temperature was 76°F. The average values for day and night temperatures during September were 92.3°F и 81.1°F respectivly.

The average sea surface temperature in September 2023 for Sanibel Island was 90.4°F. The maximum and minimum values were 88.2°F and 92.6°F respectively.

Most of the days in September are cloudy but you can also expect sunny or gloomy days.

Precipitation total in September for Sanibel Island is 2.7 in. It makes september one of the most rainy months of the year.

The average wind speed in September is 7.2 mph. It makes September one of the most windless months of the year for Sanibel Island.

We are using day length and cloud cover information for each day of the month to calculate averages for this chart. Average sunny hours for Sanibel Island in September is 6.1 hours.