Chelan County (Wenatchee)
September
Weather in Chelan County for September 2025
Your guide to Chelan County weather in September - trends and predictions
In general, the average temperature in Chelan County at the beginning of September is 32.7 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 21 °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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Temperatures
Rain 🌧️
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29
Dry days
1
Rainy days
0
Snow days
26°/10°
Temperatures
13 km/h
Avg max wind
50 %
Avg humidity
Chelan County Weather September
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Temperatures trend during September in Chelan County
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September weather in Chelan County day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Partly cloudy | 35° /17° | 0 mm | 9 | |
| Sept. 2 | Partly cloudy | 33° /15° | 0 mm | 8 | |
| Sept. 3 |  Sunny | 29° /12° | 0 mm | 7 | |
| Sept. 4 | Sunny | 30° /11° | 0 mm | 8 | |
| Sept. 5 | Sunny | 33° /13° | 0 mm | 8 | |
| Sept. 6 | Sunny | 35° /14° | 0 mm | 9 | |
| Sept. 7 |  Cloudy | 34° /17° | 0 mm | 7 | |
| Sept. 8 | Partly cloudy | 35° /17° | 0 mm | 9 | |
| Sept. 9 | Partly cloudy | 29° /13° | 0 mm | 7 | |
| Sept. 10 | Partly cloudy | 28° /12° | 0 mm | 7 | |
| Sept. 11 |  Patchy rain possible | 20° /10° | 0.1 mm | 5 | |
| Sept. 12 | Partly cloudy | 23° /8° | 0 mm | 6 | |
| Sept. 13 | Sunny | 23° /7° | 0.1 mm | 6 | |
| Sept. 14 | Partly cloudy | 23° /10° | 0 mm | 6 | |
| Sept. 15 | Sunny | 21° /7° | 0 mm | 6 | |
| Sept. 16 | Sunny | 26° /9° | 0 mm | 7 | |
| Sept. 17 | Partly cloudy | 24° /8° | 0 mm | 6 | |
| Sept. 18 | Partly cloudy | 23° /7° | 0 mm | 6 | |
| Sept. 19 | Sunny | 26° /6° | 0 mm | 7 | |
| Sept. 20 | Sunny | 20° /9° | 0 mm | 6 | |
| Sept. 21 |  Overcast | 23° /8° | 0 mm | 5 | |
| Sept. 22 | Overcast | 26° /8° | 0 mm | 6 | |
| Sept. 23 | Partly cloudy | 27° /11° | 0 mm | 7 | |
| Sept. 24 | Sunny | 29° /13° | 0 mm | 7 | |
| Sept. 25 | Patchy rain possible | 25° /13° | 0.8 mm | 6 | |
| Sept. 26 | Cloudy | 20° /7° | 0.2 mm | 5 | |
| Sept. 27 | Partly cloudy | 21° /8° | 0 mm | 6 | |
| Sept. 28 | Overcast | 22° /5° | 0 mm | 5 | |
| Sept. 29 | Partly cloudy | 15° /0° | 0 mm | 5 | |
| Sept. 30 | Sunny | 15° /2° | 0 mm | 5 | |
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Important Notice
Our weather forecast for Chelan County in September is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Chelan County forecast closer to your planned date for the most up-to-date weather information.
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Chelan County in September - FAQ
What are the expected maximum and minimum temperatures in Chelan County during September?
Enjoy moderate daytime temperatures of up to 26° and cooler nights around 10°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Chelan County during September?
Rainfall in Chelan County during September is rare to nonexistent, with the total expected rainfall being less than 10 mm and approximately 1 days seeing any precipitation. Planning without the concern for rain is generally straightforward during this very dry period.
What are the typical wind conditions in Chelan County during September?
The average wind speed in Chelan County during September is 13 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Chelan County
Explore the daily rainfall trends and prepare for Chelan Countys September weather 💧
UV exposure in Chelan County during September
Stay informed about UV levels for safe outdoor activities throughout the month of 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.
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