August weather forecast in Groton

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August in Groton is the sunniest month of the year. In August, the weather in Groton is typically warm. Average daily high temperature in August is about 25 degrees above zero. On average, Groton has 18 sunny, 9 partly cloudy, and 4 rainy days in August. The rains are usually heavy. August as well as September is considered the most comfortable time to visit Groton.

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