Clatsop County (Astoria)
September
Weather in Clatsop County, Oregon for September 2026
Your guide to Clatsop County weather in September - trends and predictions
So far, September 2026 in Clatsop County is slightly warmer than the historical average by 0.8 °F.
The forecast for the next days in Clatsop County predicts temperatures to be around 17 °F, close to the historical average.
In general, the average temperature in Clatsop County at the beginning of September is 18.1 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 14.1 °F by the end of September.
Clatsop County experiences moderate rainfall in September, with an average of 9 rainy days and a total precipitation of 75.1 mm.
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Temperatures
Rain 🌧️
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21
Dry days
9
Rainy days
0
Snow days
16°/12°
Temperatures
14 km/h
Avg max wind
89 %
Avg humidity
Clatsop County Weather September
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Temperatures trend during September in Clatsop County
See the weather trend as well as the moving average line
September weather in Clatsop County day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Cloudy | 17° /13° | 1.7 mm | 3 | |
| Sept. 2 |  Patchy rain possible | 17° /12° | 23.4 mm | 3 | |
| Sept. 3 | Patchy rain possible | 17° /11° | 87.1 mm | 3 | |
| Sept. 4 |  Sunny | 20° /11° | 0 mm | 5 | |
| Sept. 5 | Sunny | 19° /13° | 0.2 mm | 5 | |
| Sept. 6 | Sunny | 19° /13° | 0 mm | 5 | |
| Sept. 7 |  Mist | 18° /13° | 3.3 mm | 4 | |
| Sept. 8 | Patchy rain possible | 19° /11° | 0 mm | 5 | |
| Sept. 9 | Patchy rain possible | 18° /11° | 0.1 mm | 4 | |
| Sept. 10 |  Overcast | 15° /11° | 0.3 mm | 3 | |
| Sept. 11 | Light rain shower | 16° /11° | 5.9 mm | 3 | |
| Sept. 12 | Light rain shower | 15° /11° | 6.1 mm | 3 | |
| Sept. 13 | Patchy rain possible | 16° /12° | 4.3 mm | 3.1 | |
| Sept. 14 | Patchy rain possible | 15° /11° | 0.5 mm | 3.8 | |
| Sept. 15 | Sunny | 17° /10° | 0 mm | 4.9 | |
| Sept. 16 | Sunny | 21° /12° | 0 mm | 5.3 | |
| Sept. 17 | Sunny | 23° /13° | 0 mm | 6 | |
| Sept. 18 | Sunny | 19° /14° | 0 mm | 5 | |
| Sept. 19 | Sunny | 16° /13° | 0 mm | 5 | |
| Sept. 20 | Overcast | 15° /12° | 0 mm | 4 | |
| Sept. 21 | Sunny | 16° /11° | 0 mm | 5 | |
| Sept. 22 | Sunny | 16° /11° | 0 mm | 5 | |
| Sept. 23 | Patchy rain possible | 15° /11° | 3.7 mm | 3 | |
| Sept. 24 | Patchy rain possible | 14° /10° | 3.5 mm | 4 | |
| Sept. 25 | Patchy rain possible | 14° /9° | 0.4 mm | 4 | |
| Sept. 26 | Sunny | 15° /9° | 1.1 mm | 4 | |
| Sept. 27 | Fog | 13° /11° | 3.5 mm | 3 | |
| Sept. 28 | Overcast | 13° /11° | 0 mm | 3 | |
| Sept. 29 | Cloudy | 14° /12° | 9.2 mm | 3 | |
| Sept. 30 |  Partly cloudy | 16° /11° | 19.9 mm | 5 | |
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Important Notice
Our weather forecast for Clatsop 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 Clatsop County forecast closer to your planned date for the most up-to-date weather information.
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Clatsop County in September - FAQ
What are the expected maximum and minimum temperatures in Clatsop County during September?
Enjoy moderate daytime temperatures of up to 16° and cooler nights around 12°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Clatsop County during September?
Moderate rainfall is anticipated in Clatsop County during September, with a total of 75.1 mm spread over approximately 9 days. Considering plans for rainy days is advisable.
What are the typical wind conditions in Clatsop County during September?
The average wind speed in Clatsop County during September is 14 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Clatsop County
Explore the daily rainfall trends and prepare for Clatsop Countys September weather 💧
Typically, Clatsop County has 9 rainy days in September with a total of 75.1 mm of rainfall.
UV exposure in Clatsop County during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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Where is Clatsop County?Get accurate weather forecasts for Clatsop County, located at latitude 46.188 and longitude -123.831. Stay updated with localized weather information tailored for Clatsop County.
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