The highest day temperature in August 2025 was 87°F. The lowest night temperature was 57°F. The average values for day and night temperatures during August were 77.2°F и 65.7°F respectivly.

The average sea surface temperature in August 2025 for Jamestown was 73.0°F. The maximum and minimum values were 69.0°F and 76.8°F respectively.

Most of the days in August are cloudy but you can also expect sunny or gloomy days.

Precipitation total in August for Jamestown is 0.9 in. It makes august one of the least rainy months of the year.

The average wind speed in August 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 August is 7.9 hours.