Astoria (OR)
September
Weather in Astoria, Oregon for September 2025
Your guide to Astoria weather in September - trends and predictions
In general, the average temperature in Astoria at the beginning of September is 20.3 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 14.9 °F by the end of September.
With an average of 5 rainy days, Astoria experiences minimal rainfall in September.
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Temperatures
Rain 🌧️
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25
Dry days
5
Rainy days
0
Snow days
17°/12°
Temperatures
14 km/h
Avg max wind
86 %
Avg humidity
Astoria Weather September
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Temperatures trend during September in Astoria
See the weather trend as well as the moving average line
September weather in Astoria day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Cloudy | 18° /13° | 0 mm | 4 | |
| Sept. 2 |  Patchy rain possible | 17° /14° | 0.5 mm | 4 | |
| Sept. 3 | Patchy rain possible | 18° /11° | 0.5 mm | 4 | |
| Sept. 4 |  Sunny | 24° /11° | 0 mm | 6 | |
| Sept. 5 | Sunny | 25° /16° | 0 mm | 7 | |
| Sept. 6 | Sunny | 21° /14° | 0 mm | 6 | |
| Sept. 7 |  Mist | 19° /14° | 0.2 mm | 4 | |
| Sept. 8 | Patchy rain possible | 18° /12° | 0.1 mm | 4 | |
| Sept. 9 | Patchy rain possible | 17° /11° | 0.2 mm | 4 | |
| Sept. 10 |  Overcast | 16° /10° | 0.5 mm | 4 | |
| Sept. 11 | Light rain shower | 16° /11° | 17.4 mm | 4 | |
| Sept. 12 | Light rain shower | 16° /11° | 0.9 mm | 4 | |
| Sept. 13 | Patchy rain possible | 16° /11° | 0 mm | 4 | |
| Sept. 14 | Patchy rain possible | 17° /12° | 0.9 mm | 4 | |
| Sept. 15 | Cloudy | 16° /10° | 0 mm | 4 | |
| Sept. 16 |  Partly cloudy | 17° /10° | 0 mm | 5 | |
| Sept. 17 |  Moderate or heavy rain shower | 15° /13° | 32.8 mm | 4 | |
| Sept. 18 | Fog | 14° /13° | 0 mm | 3 | |
| Sept. 19 | Fog | 13° /12° | 0 mm | 3 | |
| Sept. 20 | Overcast | 13° /12° | 0 mm | 3 | |
| Sept. 21 | Mist | 17° /10° | 0 mm | 4 | |
| Sept. 22 | Fog | 14° /11° | 0 mm | 3 | |
| Sept. 23 | Fog | 16° /14° | 0 mm | 4 | |
| Sept. 24 | Mist | 18° /13° | 0 mm | 4 | |
| Sept. 25 |  Heavy rain at times | 14° /12° | 5.2 mm | 3 | |
| Sept. 26 | Heavy rain at times | 14° /12° | 8.4 mm | 3 | |
| Sept. 27 | Fog | 14° /12° | 6.9 mm | 3 | |
| Sept. 28 | Overcast | 13° /11° | 0 mm | 3 | |
| Sept. 29 | Cloudy | 14° /11° | 0 mm | 3 | |
| Sept. 30 | Partly cloudy | 17° /10° | 0 mm | 5 | |
| Next | |||||
Important Notice
Our weather forecast for Astoria 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 Astoria forecast closer to your planned date for the most up-to-date weather information.
Change Month
Astoria in September - FAQ
What are the expected maximum and minimum temperatures in Astoria 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 Astoria during September?
Moderate rainfall is anticipated in Astoria 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 Astoria during September?
The average wind speed in Astoria during September is 14 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Astoria
Explore the daily rainfall trends and prepare for Astorias September weather 💧
UV exposure in Astoria during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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