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Seattle weather in september october
September-October . You’ll be able to . Jul 18, · The weather in Seattle in September is beautiful. Temperatures stay in the 50s, and high 60s throughout the month, sometimes pushing into the low 70s. Even though the temperature begins to cool, the September weather is lovely and October weather is fairly mild until the. In Seattle during September average daily high temperatures decrease from 75°F to 67°F and the fraction of time spent overcast or mostly cloudy increases. In Seattle during September average daily high temperatures decrease from 75°F to 67°F and the fraction of time spent overcast or mostly cloudy increases . Get the monthly weather forecast for Seattle, WA, including daily high/low, historical averages, to help you plan ahead. Get the monthly weather forecast for Seattle, WA, including daily high/low, historical averages, to help you plan ahead. . The average temperature in Seattle in October for a typical day ranges from a high of 60°F (16°C) and a low of 45°F (7°C). Some would describe it as moderately chilly humid but cool. In Seattle during October average daily high temperatures decrease from 67°F to 56°F and the fraction of time spent overcast or mostly cloudy increases from. The weather in Seattle in October is moderately chilly humid but cool, with average highs of 60°F (16°C) and lows of 45°F (7°C).