The highest day temperature in July 2025 was 94°F. The lowest night temperature was 82°F. The average values for day and night temperatures during July were 91.3°F и 85.8°F respectivly.

The average sea surface temperature in July 2025 for Sanibel Island was 91.0°F. The maximum and minimum values were 89.2°F and 93.6°F respectively.

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

Precipitation total in July for Sanibel Island is 2.5 in. It makes july the most rainy month of the year.

The average wind speed in July is 7.2 mph. It makes July the most windless month 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 July is 7.4 hours.