The highest day temperature in July 2025 was 102°F. The lowest night temperature was 65°F. The average values for day and night temperatures during July were 88.3°F и 73.7°F respectivly.

The average sea surface temperature in July 2025 for New Haven was 75.2°F. The maximum and minimum values were 69.8°F and 79.6°F respectively.

You can expect various weather conditions during July. Be ready for sunny, cloudy or even gloomy days.

Precipitation total in July for New Haven is 1.4 in. It makes july one of the most rainy months of the year.

The average wind speed in July is 6.9 mph. It makes July the most windless month 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 July is 8.1 hours.