September weather forecast
Washington, USA

September ushers in a transitional period as Washington bids farewell to the height of summer and begins to welcome the first whispers of autumn. In the western locales of Bellevue and Tacoma, average low temperatures cool to 50°F (10°C), indicating the approach of fall. Eastern cities like Spokane and Pullman follow suit with nighttime lows between 45°F (7.2°C) to 55°F (12.8°C).

As the month progresses, the frequency of sunny days starts to wane, particularly in the western regions, making way for increasing cloud cover. Precipitation is moderate, with the west generally receiving around 1.5" (38mm) and the east less than 1" (25mm). Winds typically fluctuate between 5 to 15mph (24.1km/h) (8.05 to 15mph (24.1km/h)), creating favorable conditions for outdoor activities that capitalize on the milder weather, such as hiking and apple picking.

In contrast to August, September witnesses a more pronounced cooling trend and an increase in cloud cover. It signifies the end of the high tourist season, yet remains a popular month for visitors who prefer a less crowded experience and milder conditions. As the state progresses into October, anticipate a notable increase in precipitation and a further drop in temperatures, setting the stage for the wet and cool conditions that dominate the autumn months.

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• Seattle - September »
  On the first day of September in Seattle sunrise is at 6:29 am and sunset at 7:49 pm. The beginning of September in Seattle brings a minor change in the average high-temperature, shifting from a warm 76.3°F (24.6°C) in August to an agreeable 69.6°F (20.9°C).
• Spokane - September »
  In Spokane in September, it is raining for 7.5 days, with typically 0.63" (16mm) of accumulated precipitation. On the last day of September, in Spokane sunrise is at 6:48 am and sunset at 6:30 pm PDT.
• Tacoma - September »
  The transition into September in Tacoma is accompanied by a slight temperature decrease, with the average high-temperature shifting from a moderately hot 78.1°F (25.6°C) in August to an agreeable 70.9°F (21.6°C). In Tacoma in September, during 11.9 rainfall days, 1.54" (39mm) of precipitation is typically accumulated.
• Vancouver - September »
  In Vancouver in September, during 10.8 rainfall days, 1.73" (44mm) of precipitation is typically accumulated. On the first day of September in Vancouver, sunrise is at 6:32 am and sunset at 7:47 pm.
• Bellevue - September »
  In Bellevue, in September, it is raining for 7.5 days, with typically 0.63" (16mm) of accumulated precipitation. On the first day of September in Bellevue, sunrise is at 6:28 am and sunset at 7:48 pm.
• Kent - September »
  By September, the sizzling heat of summer begins to soften, yet the weather in Kent is still largely warm and dry. The average sunshine duration in September in Kent, Washington, is 9.3h.
• Everett - September »
  The arrival of autumn in Everett, Washington is marked by cooler temperatures and increased rainfall in September. On the first day of September in Everett, sunrise is at 6:28 am and sunset at 7:49 pm.
• Renton - September »
  In Renton in September, during 5.9 rainfall days, 0.31" (8mm) of precipitation is typically accumulated. With the arrival of September, Renton experiences a modest decline in average high-temperatures, transitioning from a moderately hot 77.4°F (25.2°C) in August to an agreeable 70.3°F (21.3°C).
• Federal Way - September »
  On the first day of September in Federal Way, sunrise is at 6:29 am and sunset at 7:48 pm. In Federal Way, in September, during 12.5 rainfall days, 1.61" (41mm) of precipitation is typically accumulated.
• Yakima - September »
  On the first day of September in Yakima, sunrise is at 6:23 am and sunset at 7:40 pm. On the first day of September in Yakima, sunrise is at 6:23 am and sunset at 7:40 pm.
• Kirkland - September »
  In Kirkland in September, it is raining for 10.9 days, with typically 1.3" (33mm) of accumulated precipitation. In Kirkland in September, it is raining for 10.9 days, with typically 1.3" (33mm) of accumulated precipitation.
• Bellingham - September »
  Signifying the onset of fall, September observes a noticeable shift in Bellingham's weather with reduction in sunshine hours and a transition towards increased precipitation and lower temperatures. In Bellingham, during September, the rain falls for 12.3 days and regularly aggregates up to 1.57" (40mm) of precipitation.