The highest day temperature in July 2025 was 90°F. The lowest night temperature was 65°F. The average values for day and night temperatures during July were 80.6°F и 72.3°F respectivly.

The average sea surface temperature in July 2025 for Mystic was 71.0°F. The maximum and minimum values were 67.0°F and 74.4°F respectively.

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

Precipitation total in July for Mystic is 1.3 in. This value is relatively stable throughout the year.

The average wind speed in July is 7.0 mph. It makes July the most windless month of the year for Mystic.

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 Mystic in July is 7.7 hours.