The highest day temperature in September 2026 was 95°F. The lowest night temperature was 58°F. The average values for day and night temperatures during September were 79.2°F и 68.6°F respectivly.

The average sea surface temperature in September 2026 for Lewes was 77.0°F. The maximum and minimum values were 67.8°F and 81.2°F respectively.

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

Precipitation total in September for Lewes is 1.3 in. It makes september one of the most rainy months of the year.

The average wind speed in September is 9.6 mph. It makes September one of the most windless months of the year for Lewes.

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 Lewes in September is 7.0 hours.