Weather in Spokane County, Washington for September 2026
Until now, September 2026 in Spokane County is cooler than usual, with temperatures averaging 21.6 °F, this is 4.7 °F below the typical seasonal average.
The forecast for the next days in Spokane County predicts temperatures to be around 18 °F, close to the historical average.
In general, the average temperature in Spokane County at the beginning of September is 28.6 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 15.3 °F by the end of September.
Spokane County experiences moderate rainfall in September, with an average of 8 rainy days and a total precipitation of 25.7 mm.
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Spokane County Weather September
Temperatures trend during September in Spokane County
September weather in Spokane County day by day
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Overcast | 33° /16° | 0.1 mm | 6 | |
| Sept. 2 | Overcast | 30° /16° | 8.9 mm | 6 | |
| Sept. 3 |  Sunny | 28° /16° | 6.8 mm | 6 | |
| Sept. 4 | Sunny | 26° /15° | 6.7 mm | 6 | |
| Sept. 5 | Sunny | 27° /12° | 0 mm | 7 | |
| Sept. 6 |  Cloudy | 29° /13° | 0 mm | 6 | |
| Sept. 7 | Sunny | 27° /14° | 11.2 mm | 5 | |
| Sept. 8 | Sunny | 29° /14° | 1.8 mm | 6 | |
| Sept. 9 | Sunny | 27° /14° | 1.9 mm | 6 | |
| Sept. 10 | Sunny | 28° /15° | 0.2 mm | 5 | |
| Sept. 11 | Overcast | 23° /14° | 6 mm | 5 | |
| Sept. 12 | Overcast | 24° /12° | 0.1 mm | 4 | |
| Sept. 13 | Sunny | 23° /12° | 4.3 mm | 5 | |
| Sept. 14 | Sunny | 21° /11° | 1.2 mm | 5 | |
| Sept. 15 | Sunny | 22° /10° | 0 mm | 5 | |
| Sept. 16 | Sunny | 27° /11° | 0 mm | 7 | |
| Sept. 17 | Overcast | 24° /13° | 3.4 mm | 6 | |
| Sept. 18 | Cloudy | 26° /12° | 0 mm | 6 | |
| Sept. 19 | Overcast | 25° /11° | 0 mm | 6 | |
| Sept. 20 | Sunny | 23° /10° | 0.2 mm | 6 | |
| Sept. 21 | Sunny | 27° /13° | 0 mm | 4.7 | |
| Sept. 22 | Overcast | 22° /15° | 0 mm | 4 | |
| Sept. 23 | Overcast | 19° /10° | 0 mm | 3.9 | |
| Sept. 24 | Overcast | 22° /9° | 0 mm | 4 | |
| Sept. 25 |  Patchy rain possible | 19° /9° | 3.5 mm | 2.8 | |
| Sept. 26 | Sunny | 14° /6° | 0 mm | 4 | |
| Sept. 27 | Overcast | 14° /7° | 0 mm | 3 | |
| Sept. 28 | Overcast | 14° /6° | 0 mm | 4 | |
| Sept. 29 | Overcast | 13° /6° | 1.8 mm | 4 | |
| Sept. 30 | Sunny | 11° /4° | 0 mm | 4 | |
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Spokane County in September - FAQ
What are the expected maximum and minimum temperatures in Spokane County during September?
How much rainfall should be expected in Spokane County during September?
What are the typical wind conditions in Spokane County during September?
September rainfall patterns in Spokane County
UV exposure in Spokane County during September
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Where is Spokane County?Get accurate weather forecasts for Spokane County, located at latitude 47.66 and longitude -117.429. Stay updated with localized weather information tailored for Spokane County.