average temperature on sanibel island december
Weather in Sanibel Island in December. The average maximum daytime temperature in Sanibel Island in December is a warm 24Â°C (75Â°F). There are usually 7 hours of bright sunshine each day, which represents 66% of the 11 hours of daylight. The average sea temperature in and around Sanibel Island in December is 22Â°C (72Â°F). Expect 43mm (1.7 inches) of rainfall across the whole of December with 6 days with some rain falling. Maximum UV levels will be moderate (5 UV index) at midday when the skies are clear.