Weather in Chelan County, Washington for September 2026
Until now, September 2026 in Chelan County is cooler than usual, with temperatures averaging 23.7 °F, this is 3.8 °F below the typical seasonal average.
The forecast for the next days in Chelan County predicts temperatures to be around 17 °F, close to the historical average.
In general, the average temperature in Chelan County at the beginning of September is 31 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 13.9 °F by the end of September.
Precipitation in Chelan County during September is a rare event, with an average of fewer than 2 rainy days.
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Chelan County Weather September
Temperatures trend during September in Chelan County
September weather in Chelan County day by day
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Overcast | 34° /14° | 0 mm | 6 | |
| Sept. 2 |  Partly cloudy | 32° /13° | 2.4 mm | 6 | |
| Sept. 3 |  Sunny | 30° /13° | 1.2 mm | 7 | |
| Sept. 4 | Sunny | 31° /13° | 0.2 mm | 7 | |
| Sept. 5 | Sunny | 30° /13° | 0 mm | 7 | |
| Sept. 6 | Overcast | 31° /14° | 0 mm | 6 | |
| Sept. 7 |  Cloudy | 29° /14° | 0 mm | 5 | |
| Sept. 8 | Partly cloudy | 30° /12° | 0 mm | 7 | |
| Sept. 9 | Partly cloudy | 27° /11° | 0 mm | 5 | |
| Sept. 10 | Partly cloudy | 29° /10° | 0 mm | 5 | |
| Sept. 11 |  Patchy rain possible | 25° /10° | 0 mm | 5 | |
| Sept. 12 | Partly cloudy | 25° /9° | 0.7 mm | 4 | |
| Sept. 13 | Sunny | 23° /8° | 8.8 mm | 5 | |
| Sept. 14 | Partly cloudy | 21° /7° | 0 mm | 5 | |
| Sept. 15 | Sunny | 21° /6° | 0.3 mm | 5 | |
| Sept. 16 | Sunny | 25° /7° | 0 mm | 6 | |
| Sept. 17 | Sunny | 27° /10° | 0 mm | 6 | |
| Sept. 18 | Sunny | 26° /9° | 0 mm | 6 | |
| Sept. 19 | Sunny | 27° /10° | 0 mm | 6 | |
| Sept. 20 | Sunny | 25° /10° | 0 mm | 6 | |
| Sept. 21 | Sunny | 26° /14° | 0 mm | 4.7 | |
| Sept. 22 | Sunny | 21° /12° | 0 mm | 4.4 | |
| Sept. 23 | Overcast | 19° /11° | 0 mm | 3.8 | |
| Sept. 24 | Overcast | 17° /10° | 1.3 mm | 3.2 | |
| Sept. 25 | Sunny | 12° /8° | 6.6 mm | 3.8 | |
| Sept. 26 | Sunny | 14° /4° | 0 mm | 4 | |
| Sept. 27 | Overcast | 12° /9° | 0.2 mm | 4 | |
| Sept. 28 | Overcast | 14° /7° | 0 mm | 4 | |
| Sept. 29 | Patchy rain possible | 14° /7° | 0.1 mm | 3 | |
| Sept. 30 | Sunny | 14° /5° | 0 mm | 4 | |
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Chelan County in September - FAQ
What are the expected maximum and minimum temperatures in Chelan County during September?
How much rainfall should be expected in Chelan County during September?
What are the typical wind conditions in Chelan County during September?
September rainfall patterns in Chelan County
UV exposure in Chelan County during September
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Where is Chelan County?Get accurate weather forecasts for Chelan County, located at latitude 47.423 and longitude -120.31. Stay updated with localized weather information tailored for Chelan County.