Sanibel Island May 2024 Weather. Coming into may, the season welcomes visitors with a still strengthening sea temperature at 26 °c (79 °f), and day temperatures bolstering to 31 °c (88 °f). Expect 31°c daytime maximum temperatures in the shade with on average 10 hours of sunshine per day in sanibel island in may.

Coming into may, the season welcomes visitors with a still strengthening sea temperature at 26 °c (79 °f), and day temperatures bolstering to 31 °c (88 °f). A risky day is not a direct prediction of precipitation (rain/snow) but instead a forecast.