The highest day temperature in June 2025 was 80°F. The lowest night temperature was 54°F. The average values for day and night temperatures during June were 66.6°F и 63.7°F respectivly.

The average sea surface temperature in June 2025 for Charlestown was 62.3°F. The maximum and minimum values were 55.4°F and 68.2°F respectively.

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

Precipitation total in June for Charlestown is 0.9 in. It makes june the least rainy month of the year.

The average wind speed in June is 9.7 mph. It makes June one of the most windless months of the year for Charlestown.

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 Charlestown in June is 8.3 hours.