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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.
American Fork 10 Day Weather. 1  Monday:The American Fork forecast for Aug 21 is 90 degrees and Sunny. There is 23 percentage chance of rain and 6 mph winds from the West. 2  Tuesday:The American Fork forecast for Aug 22 is 85 degrees and Sunny. There is 30 percentage chance of rain and 9 mph winds from the Southwest.