Weather in Coos County, Oregon for September 2026
Until now, September 2026 in Coos County has been nearly identical to the historical average, with a temperature of 18.5 °F (showing only a slight deviation of 0.2 °F).
Expect cooler weather in the next days in Coos County with the forecast suggesting a temperature of 16.9 °F, lower than the historical average.
In general, the average temperature in Coos County at the beginning of September is 18.4 °F. As the month progressed, temperatures tended to moderately fall, reaching an average of 17 °F by the end of September.
Coos County experiences moderate rainfall in September, with an average of 7 rainy days and a total precipitation of 58.3 mm.
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Coos County Weather September
Temperatures trend during September in Coos County
September weather in Coos County day by day
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Cloudy | 18° /12° | 0.4 mm | 3 | |
| Sept. 2 |  Overcast | 17° /11° | 59.7 mm | 3 | |
| Sept. 3 |  Sunny | 18° /12° | 9.1 mm | 4 | |
| Sept. 4 | Sunny | 20° /13° | 10.7 mm | 4 | |
| Sept. 5 | Sunny | 19° /13° | 0 mm | 4 | |
| Sept. 6 | Overcast | 18° /12° | 0.2 mm | 3 | |
| Sept. 7 | Overcast | 19° /12° | 0 mm | 5 | |
| Sept. 8 | Cloudy | 20° /12° | 0 mm | 5 | |
| Sept. 9 | Overcast | 21° /12° | 0 mm | 5 | |
| Sept. 10 |  Partly cloudy | 17° /12° | 0.1 mm | 4 | |
| Sept. 11 |  Moderate or heavy rain shower | 17° /11° | 4.8 mm | 4 | |
| Sept. 12 |  Patchy rain possible | 17° /11° | 10.9 mm | 4 | |
| Sept. 13 | Partly cloudy | 17° /11° | 4.8 mm | 5 | |
| Sept. 14 | Patchy rain possible | 18° /11° | 3.5 mm | 5 | |
| Sept. 15 | Sunny | 15° /11° | 0 mm | 5.4 | |
| Sept. 16 | Sunny | 17° /12° | 0 mm | 5.7 | |
| Sept. 17 | Sunny | 16° /12° | 0 mm | 5 | |
| Sept. 18 | Sunny | 16° /13° | 0.1 mm | 5 | |
| Sept. 19 | Sunny | 17° /12° | 0 mm | 5 | |
| Sept. 20 | Sunny | 17° /13° | 0 mm | 5 | |
| Sept. 21 | Sunny | 16° /13° | 0 mm | 5 | |
| Sept. 22 | Sunny | 17° /13° | 0 mm | 5 | |
| Sept. 23 | Sunny | 20° /14° | 0 mm | 6 | |
| Sept. 24 | Sunny | 18° /14° | 0 mm | 5 | |
| Sept. 25 | Overcast | 18° /13° | 0 mm | 5 | |
| Sept. 26 | Overcast | 17° /14° | 0 mm | 4 | |
| Sept. 27 |  Fog | 16° /14° | 9.1 mm | 5 | |
| Sept. 28 | Mist | 16° /13° | 0.8 mm | 5 | |
| Sept. 29 | Partly cloudy | 17° /12° | 19.5 mm | 5 | |
| Sept. 30 | Partly cloudy | 17° /11° | 0 mm | 5 | |
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Coos County in September - FAQ
What are the expected maximum and minimum temperatures in Coos County during September?
How much rainfall should be expected in Coos County during September?
What are the typical wind conditions in Coos County during September?
September rainfall patterns in Coos County
UV exposure in Coos County during September
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Where is Coos County?Get accurate weather forecasts for Coos County, located at latitude 43.367 and longitude -124.218. Stay updated with localized weather information tailored for Coos County.