The highest day temperature in May 2025 was 75°F. The lowest night temperature was 43°F. The average values for day and night temperatures during May were 64.8°F и 53.5°F respectivly.

The average sea surface temperature in May 2025 for Stonington was 52.5°F. The maximum and minimum values were 47.2°F and 56.8°F respectively.

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

Precipitation total in May for Stonington is 1.2 in. This value is relatively stable throughout the year.

The average wind speed in May is 8.2 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 Stonington in May is 7.2 hours.