The highest day temperature in December 2025 was 88°F. The lowest night temperature was 49°F. The average values for day and night temperatures during December were 78.4°F и 66.3°F respectivly.

The average sea surface temperature in December 2025 for Sanibel Island was 73.2°F. The maximum and minimum values were 70.8°F and 76.0°F respectively.

Most of the days in December are sunny but you can also expect cloudy and gloomy days.

Precipitation total in December for Sanibel Island is 0.4 in. It makes december one of the least rainy months of the year.

The average wind speed in December is 10.0 mph. It makes December one of the most windy 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 December is 7.1 hours.