The highest day temperature in July 2025 was 86°F. The lowest night temperature was 65°F. The average values for day and night temperatures during July were 78.3°F и 71.5°F respectivly.

The average sea surface temperature in July 2025 for Jamestown was 73.3°F. The maximum and minimum values were 69.2°F and 76.6°F respectively.

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

Precipitation total in July for Jamestown is 1.0 in. It makes july one of the least rainy months of the year.

The average wind speed in July is 7.3 mph. This value is relatively stable throughout the year.

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 Jamestown in July is 7.6 hours.