September weather forecast in Washington

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September in Washington is the sunniest month of the year. In September, the weather in Washington is typically warm. Average daily high temperature in September is about 27 degrees above zero. On average, Washington has 16 sunny, 7 rainy, 6 partly cloudy, and 1 cloudy day in September. The rains are usually heavy. September as well as October is considered the most comfortable time to visit Washington.

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