The highest day temperature in April 2026 was 84°F. The lowest night temperature was 28°F. The average values for day and night temperatures during April were 58.4°F и 42.2°F respectivly.

The average sea surface temperature in April 2026 for Groton was 42.5°F. The maximum and minimum values were 38.2°F and 46.0°F respectively.

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

Precipitation total in April for Groton is 1.1 in. This value is relatively stable throughout the year.

The average wind speed in April is 9.5 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 Groton in April is 6.7 hours.