Asotin County (Clarkston)
September
Weather in Asotin County, Washington for September 2026
Your guide to Asotin County weather in September - trends and predictions
Until now, September 2026 in Asotin County is cooler than usual, with temperatures averaging 24.9 °F, this is 2.7 °F below the typical seasonal average.
The forecast for the next days in Asotin County predicts temperatures to be around 19 °F, close to the historical average.
In general, the average temperature in Asotin County at the beginning of September is 31.3 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 17.1 °F by the end of September.
With an average of 2 rainy days, Asotin County experiences minimal rainfall in September.
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Temperatures
Rain 🌧️
More
28
Dry days
2
Rainy days
0
Snow days
28°/13°
Temperatures
13 km/h
Avg max wind
46 %
Avg humidity
Asotin County Weather September
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Temperatures trend during September in Asotin County
See the weather trend as well as the moving average line
September weather in Asotin County day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Sunny | 36° /17° | 0.1 mm | 5 | |
| Sept. 2 | Sunny | 32° /16° | 14.5 mm | 5 | |
| Sept. 3 | Sunny | 31° /16° | 36.1 mm | 6 | |
| Sept. 4 | Sunny | 32° /15° | 5.7 mm | 8 | |
| Sept. 5 | Sunny | 30° /12° | 0 mm | 7 | |
| Sept. 6 |  Cloudy | 30° /13° | 0.7 mm | 5 | |
| Sept. 7 |  Overcast | 28° /14° | 1.2 mm | 4 | |
| Sept. 8 |  Thundery outbreaks possible | 29° /12° | 0 mm | 6 | |
| Sept. 9 | Overcast | 26° /13° | 0 mm | 6 | |
| Sept. 10 | Thundery outbreaks possible | 29° /15° | 0 mm | 5 | |
| Sept. 11 | Overcast | 24° /14° | 0.1 mm | 4 | |
| Sept. 12 |  Moderate rain | 26° /13° | 3.8 mm | 3 | |
| Sept. 13 | Sunny | 23° /11° | 9.3 mm | 4 | |
| Sept. 14 | Moderate rain | 19° /10° | 7.4 mm | 3 | |
| Sept. 15 |  Partly cloudy | 20° /10° | 0 mm | 4 | |
| Sept. 16 | Sunny | 26° /10° | 0 mm | 6 | |
| Sept. 17 | Sunny | 27° /12° | 0 mm | 6 | |
| Sept. 18 | Sunny | 28° /13° | 0.1 mm | 6 | |
| Sept. 19 | Cloudy | 29° /15° | 0 mm | 6 | |
| Sept. 20 | Sunny | 29° /14° | 0 mm | 6 | |
| Sept. 21 | Sunny | 28° /14° | 0 mm | 5 | |
| Sept. 22 | Overcast | 25° /16° | 0 mm | 4.4 | |
| Sept. 23 | Overcast | 22° /12° | 0 mm | 4.7 | |
| Sept. 24 | Overcast | 27° /13° | 0 mm | 4.3 | |
| Sept. 25 | Overcast | 19° /11° | 2 mm | 3.1 | |
| Sept. 26 | Sunny | 17° /7° | 0 mm | 5 | |
| Sept. 27 | Overcast | 16° /10° | 0.5 mm | 4 | |
| Sept. 28 |  Patchy rain possible | 14° /9° | 0.6 mm | 4 | |
| Sept. 29 | Light rain shower | 13° /6° | 4.5 mm | 3 | |
| Sept. 30 | Sunny | 14° /6° | 0.1 mm | 4 | |
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Important Notice
Our weather forecast for Asotin 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 Asotin County forecast closer to your planned date for the most up-to-date weather information.
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Asotin County in September - FAQ
What are the expected maximum and minimum temperatures in Asotin County during September?
Enjoy moderate daytime temperatures of up to 28° and cooler nights around 13°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Asotin County during September?
Expect minimal rainfall in Asotin County during September, with a total of 17.7 mm over approximately 2 days. This minimal precipitation is unlikely to significantly impact plans.
What are the typical wind conditions in Asotin County during September?
The average wind speed in Asotin County during September is 13 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Asotin County
Explore the daily rainfall trends and prepare for Asotin Countys September weather 💧
Typically, Asotin County has 2 rainy days in September with a total of 17.7 mm of rainfall.
UV exposure in Asotin County during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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Where is Asotin County?Get accurate weather forecasts for Asotin County, located at latitude 46.416 and longitude -117.046. Stay updated with localized weather information tailored for Asotin County.
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