The highest day temperature in September 2026 was 89°F. The lowest night temperature was 58°F. The average values for day and night temperatures during September were 75.8°F и 72.1°F respectivly.

The average sea surface temperature in September 2026 for Sea Isle City was 77.0°F. The maximum and minimum values were 69.0°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 Sea Isle City is 1.3 in. It makes september one of the most rainy months of the year.

The average wind speed in September is 10.3 mph.

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 Sea Isle City in September is 7.2 hours.