The highest day temperature in July 2026 was 108°F. The lowest night temperature was 57°F. The average values for day and night temperatures during July were 87.6°F и 68.4°F respectivly.

The average sea surface temperature in July 2026 for Groton was 70.2°F. The maximum and minimum values were 67.2°F and 73.2°F respectively.

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

Precipitation total in July for Groton is 1.2 in. This value is relatively stable throughout the year.

The average wind speed in July is 7.3 mph. It makes July one of the most windless months of the year for Groton.

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 Groton in July is 8.4 hours.