The highest day temperature in July 2025 was 78°F. The lowest night temperature was 54°F. The average values for day and night temperatures during July were 68.9°F и 60.1°F respectivly.

The average sea surface temperature in July 2025 for Plymouth was 63.7°F. The maximum and minimum values were 60.8°F and 65.4°F respectively.

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

Precipitation total in July for Plymouth is 1.9 in. It makes july one of the least rainy months of the year.

The average wind speed in July is 10.7 mph. It makes July the most windless month of the year for Plymouth.

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 Plymouth in July is 8.3 hours.