The highest day temperature in June 2026 was 94°F. The lowest night temperature was 46°F. The average values for day and night temperatures during June were 84.2°F и 63.0°F respectivly.

The average sea surface temperature in June 2026 for Groton was 61.9°F. The maximum and minimum values were 53.2°F and 66.6°F respectively.

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

Precipitation total in June for Groton is 1.0 in. This value is relatively stable throughout the year.

The average wind speed in June is 7.8 mph. It makes June 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 June is 8.8 hours.