The highest day temperature in September 2025 was 89°F. The lowest night temperature was 80°F. The average values for day and night temperatures during September were 86.6°F и 83.5°F respectivly.

The average sea surface temperature in September 2025 for Dauphin Island was 88.0°F. The maximum and minimum values were 86.0°F and 89.8°F respectively.

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

Precipitation total in September for Dauphin Island is 2.6 in. It makes september the most rainy month of the year.

The average wind speed in September is 9.1 mph. It makes September one of the most windless months of the year for Dauphin 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 Dauphin Island in September is 7.9 hours.