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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.
Climate Of Jamestown. 1  The climate of Jamestown was far from what English settlers were used to. 2  The summers were filled with tropical humidity breeding mosquitoes and flies. 3  The winters were bitter cold.  1607-1608 the settlers were faced with a cruel winter historians call âThe Little Ice Ageâ.