Clarkston (WA)
September
Weather in Clarkston, Washington for September 2026
Your guide to Clarkston weather in September - trends and predictions
In general, the average temperature in Clarkston at the beginning of September is 36.3 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 25.3 °F by the end of September.
With an average of 2 rainy days, Clarkston 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
Clarkston Weather September
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Temperatures trend during September in Clarkston
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September weather in Clarkston day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Sunny | 39° /19° | 0 mm | 9 | |
| Sept. 2 | Sunny | 39° /20° | 0 mm | 9 | |
| Sept. 3 | Sunny | 40° /20° | 0 mm | 10 | |
| Sept. 4 | Sunny | 39° /20° | 0 mm | 9 | |
| Sept. 5 | Sunny | 32° /14° | 0 mm | 8 | |
| Sept. 6 |  Cloudy | 34° /15° | 0 mm | 7 | |
| Sept. 7 |  Overcast | 31° /17° | 0 mm | 7 | |
| Sept. 8 |  Thundery outbreaks possible | 29° /13° | 0 mm | 6 | |
| Sept. 9 | Overcast | 24° /15° | 0 mm | 5 | |
| Sept. 10 | Thundery outbreaks possible | 25° /16° | 0 mm | 6 | |
| Sept. 11 | Overcast | 21° /13° | 0 mm | 5 | |
| Sept. 12 |  Moderate rain | 23° /14° | 7.6 mm | 5 | |
| Sept. 13 | Sunny | 29° /12° | 0 mm | 7 | |
| Sept. 14 | Moderate rain | 19° /11° | 10.1 mm | 4 | |
| Sept. 15 |  Partly cloudy | 20° /10° | 0 mm | 6 | |
| Sept. 16 | Sunny | 28° /8° | 0 mm | 7 | |
| Sept. 17 | Sunny | 31° /12° | 0 mm | 8 | |
| Sept. 18 | Sunny | 32° /14° | 0 mm | 8 | |
| Sept. 19 | Cloudy | 32° /17° | 0 mm | 7 | |
| Sept. 20 | Sunny | 31° /15° | 0 mm | 8 | |
| Sept. 21 | Overcast | 21° /11° | 0 mm | 5 | |
| Sept. 22 | Sunny | 21° /7° | 0 mm | 6 | |
| Sept. 23 | Sunny | 28° /9° | 0 mm | 7 | |
| Sept. 24 | Sunny | 31° /11° | 0 mm | 8 | |
| Sept. 25 | Sunny | 30° /11° | 0 mm | 8 | |
| Sept. 26 | Sunny | 19° /9° | 0 mm | 5 | |
| Sept. 27 | Partly cloudy | 27° /6° | 0 mm | 7 | |
| Sept. 28 | Overcast | 26° /10° | 0 mm | 6 | |
| Sept. 29 | Overcast | 21° /13° | 0 mm | 5 | |
| Sept. 30 | Cloudy | 23° /10° | 0 mm | 5 | |
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Important Notice
Our weather forecast for Clarkston 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 Clarkston forecast closer to your planned date for the most up-to-date weather information.
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Clarkston in September - FAQ
What are the expected maximum and minimum temperatures in Clarkston 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 Clarkston during September?
Expect minimal rainfall in Clarkston 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 Clarkston during September?
The average wind speed in Clarkston during September is 13 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Clarkston
Explore the daily rainfall trends and prepare for Clarkstons September weather 💧
UV exposure in Clarkston during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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