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September spokane weather
Get the monthly weather forecast for Spokane, WA, including daily high/low, historical averages, to help you plan ahead. The weather in Spokane Valley in September is mildly cool with a gentle breeze, with average highs of 75°F (24°C) and lows of 48°F (9°C). September Weather in Spokane Washington, United States Daily high temperatures decrease by 12°F, from 82°F to 69°F, rarely falling below 58°F or exceeding 92° . Get the monthly weather forecast for Spokane, WA, including daily high/low, historical averages, to help you plan ahead. Get the monthly weather forecast for Spokane, WA, including daily high/low, historical averages, to help you plan ahead. . The average temperature in Spokane in September for a typical day ranges from a high of 75°F (24°C) and a low of 48°F (9°C). Some would describe it as mildly cool with a gentle breeze. Mostly cloudy throughout the day. ; Tuesday, Sep High: 79° Low: 55°. Clear throughout the day. Weekly Forecast ; Monday, Sep High: 81° Low: 54°.