Clatsop County (Astoria)
September
Weather in Clatsop County, Oregon for September 2025
Your guide to Clatsop County weather in September - trends and predictions
Until now, September 2025 in Clatsop County is slightly cooler than the historical average by -1.8 °F.
The forecast for the next days in Clatsop County predicts temperatures to be around 15 °F, close to the historical average.
In general, the average temperature in Clatsop County at the beginning of September is 17.9 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 14.4 °F by the end of September.
With an average of 5 rainy days, Clatsop County experiences minimal rainfall in September.
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Temperatures
Rain 🌧️
More
25
Dry days
5
Rainy days
0
Snow days
17°/12°
Temperatures
14 km/h
Avg max wind
86 %
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 | 16° /13° | 0 mm | 4 | |
| Sept. 2 |  Patchy rain possible | 17° /13° | 0.2 mm | 4 | |
| Sept. 3 | Patchy rain possible | 17° /12° | 0.3 mm | 4 | |
| Sept. 4 |  Sunny | 20° /12° | 0 mm | 5 | |
| Sept. 5 | Sunny | 20° /15° | 0 mm | 5 | |
| Sept. 6 | Sunny | 18° /14° | 0 mm | 5 | |
| Sept. 7 |  Mist | 17° /14° | 0.1 mm | 4 | |
| Sept. 8 | Patchy rain possible | 17° /12° | 0.1 mm | 4 | |
| Sept. 9 | Patchy rain possible | 16° /12° | 0.1 mm | 4 | |
| Sept. 10 |  Overcast | 15° /11° | 0.3 mm | 4 | |
| Sept. 11 | Light rain shower | 15° /12° | 8.7 mm | 4 | |
| Sept. 12 | Light rain shower | 15° /12° | 0.4 mm | 4 | |
| Sept. 13 | Patchy rain possible | 15° /12° | 0 mm | 4 | |
| Sept. 14 | Patchy rain possible | 16° /12° | 1.6 mm | 4 | |
| Sept. 15 | Cloudy | 17° /11° | 0 mm | 4 | |
| Sept. 16 |  Partly cloudy | 20° /12° | 0 mm | 6 | |
| Sept. 17 |  Moderate or heavy rain shower | 15° /13° | 32.8 mm | 4 | |
| Sept. 18 | Fog | 14° /10° | 0 mm | 1.1 | |
| Sept. 19 | Fog | 13° /10° | 0 mm | 1.2 | |
| Sept. 20 | Patchy rain possible | 17° /12° | 3.1 mm | 0.9 | |
| Sept. 21 | Patchy rain possible | 17° /11° | 2.5 mm | 0 | |
| Sept. 22 | Sunny | 17° /10° | 0 mm | 4 | |
| Sept. 23 | Partly cloudy | 16° /11° | 0 mm | 4 | |
| Sept. 24 |  Moderate rain | 14° /10° | 6.6 mm | 3 | |
| Sept. 25 | Patchy rain possible | 12° /10° | 4.7 mm | 3 | |
| Sept. 26 | Patchy rain possible | 16° /11° | 1.9 mm | 3 | |
| Sept. 27 | Patchy rain possible | 17° /11° | 0.3 mm | 3 | |
| Sept. 28 | Patchy rain possible | 15° /11° | 0.3 mm | 3 | |
| Sept. 29 | Patchy rain possible | 13° /10° | 3.7 mm | 3 | |
| Sept. 30 | Patchy rain possible | 14° /10° | 0.8 mm | 3 | |
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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 17° 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 74.6 mm spread over approximately 5 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 💧
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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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