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 »
  In Seattle during September, the rain falls for 6 days and regularly aggregates up to 0.28" (7mm) of precipitation. In Seattle, during September, the rain falls for 6 days and regularly aggregates up to 0.28" (7mm) of precipitation.
• Spokane - September »
  In Spokane in September, during 7.5 rainfall days, 0.63" (16mm) of precipitation is typically accumulated. In Spokane, during September, the rain falls for 7.5 days and regularly aggregates up to 0.63" (16mm) of precipitation.
• Tacoma - September »
  In Tacoma, Washington, during September, the rain falls for 11.9 days and regularly aggregates up to 1.54" (39mm) of precipitation. In September, the average ocean temperature in Tacoma is 53.4°F (11.9°C).
• Vancouver - September »
  The arrival of September in Vancouver suggests a slight decrease in the average high-temperature, moving from a warm 80.6°F (27°C) in August to an agreeable 73°F (22.8°C). In Vancouver, in September, during 10.8 rainfall days, 1.73" (44mm) of precipitation is typically accumulated.
• Bellevue - September »
  On the last day of September, in Bellevue sunrise is at 7:06 am and sunset at 6:50 pm PDT. In Bellevue, in September, it is raining for 7.5 days, with typically 0.63" (16mm) of accumulated precipitation.
• Kent - September »
  In Kent in September, during 12 rainfall days, 1.5" (38mm) of precipitation is typically accumulated. On the first day of September in Kent, sunrise is at 6:28 am and sunset at 7:49 pm.
• Everett - September »
  In Everett in September, during 12.3 rainfall days, 1.77" (45mm) of precipitation is typically accumulated. The arrival of autumn in Everett, Washington is marked by cooler temperatures and increased rainfall in September.
• Renton - September »
  On the last day of September, in Renton, sunrise is at 7:06 am and sunset at 6:51 pm PDT. Renton experiences a moderate temperature shift at the start of September, with average high-temperatures adjusting a bit from a moderately hot 77.4°F (25.2°C) in August to an agreeable 70.3°F (21.3°C).
• Federal Way - September »
  In Federal Way during September, the rain falls for 12.5 days and regularly aggregates up to 1.61" (41mm) of precipitation. In Federal Way, during September, the rain falls for 12.5 days and regularly aggregates up to 1.61" (41mm) of precipitation.
• Yakima - September »
  In Yakima, Washington, in September, it is raining for 3.9 days, with typically 0.24" (6mm) of accumulated precipitation. In Yakima, in September, during 3.9 rainfall days, 0.24" (6mm) of precipitation is typically accumulated.
• Kirkland - September »
  In Kirkland in September, it is raining for 10.9 days, with typically 1.3" (33mm) of accumulated precipitation. On the first day of September in Kirkland, sunrise is at 6:27 am and sunset at 7:50 pm.
• 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. On the first day of September in Bellingham, sunrise is at 6:27 am and sunset at 7:52 pm.