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Guide to Jamestown weather in August. The average maximum daytime temperature in Jamestown in August is a warm 28Â°C (82Â°F) with low heat & humidity. The average night-time temperature is usually a cool 13Â°C (55Â°F). There are usually 10 hours of bright sunshine each day, which represents 70% of the 14 hours of daylight.
Check more long-term weather averages for Jamestown in August before you book your next holiday to North Dakota in 2017. 1  Jamestown weather overview. 2  Jamestown monthly weather. 3  Jamestown 5-day forecast. 4  North Dakota holidays. 5  North Dakota map. 6  More destinations. 7  Back to North Dakota.