The highest day temperature in September 2026 was 87°F. The lowest night temperature was 45°F. The average values for day and night temperatures during September were 70.7°F и 56.0°F respectivly.

The average sea surface temperature in September 2026 for Freeport was 62.6°F. The maximum and minimum values were 58.2°F and 66.4°F respectively.

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

Precipitation total in September for Freeport is 0.8 in. It makes september one of the least rainy months of the year.

The average wind speed in September is 7.1 mph. It makes September one of the most windless months of the year for Freeport.

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 Freeport in September is 7.0 hours.