The highest day temperature in September 2023 was 91°F. The lowest night temperature was 50°F. The average values for day and night temperatures during September were 74.6°F и 63.9°F respectivly.

The average sea surface temperature in September 2023 for New Haven was 73.4°F. The maximum and minimum values were 68.0°F and 78.8°F respectively.

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

Precipitation total in September for New Haven is 1.8 in. It makes september one of the most rainy months of the year.

The average wind speed in September is 8.5 mph. It makes September one of the most windless months of the year for New Haven.

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 New Haven in September is 7.7 hours.