The highest day temperature in August 2026 was 100°F. The lowest night temperature was 78°F. The average values for day and night temperatures during August were 94.6°F и 82.7°F respectivly.

The average sea surface temperature in August 2026 for Sanibel Island was 92.2°F. The maximum and minimum values were 90.4°F and 93.8°F respectively.

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

Precipitation total in August for Sanibel Island is 2.5 in. It makes august one of the most rainy months of the year.

The average wind speed in August is 8.0 mph. This value is relatively stable throughout the year.

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 August is 7.3 hours.