The highest day temperature in March 2026 was 72°F. The lowest night temperature was 12°F. The average values for day and night temperatures during March were 45.5°F и 34.6°F respectivly.

The average sea surface temperature in March 2026 for Groton was 36.2°F. The maximum and minimum values were 32.0°F and 39.4°F respectively.

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

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

The average wind speed in March is 10.1 mph. It makes March one of the most windy 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 March is 6.3 hours.