Weather in Coos Bay, Oregon for September 2026
Until now, September 2026 in Coos Bay 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 Bay with the forecast suggesting a temperature of 16.9 °F, lower than the historical average.
In general, the average temperature in Coos Bay 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 Bay 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 Bay Weather September
Temperatures trend during September in Coos Bay
September weather in Coos Bay 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 Bay in September - FAQ
What are the expected maximum and minimum temperatures in Coos Bay during September?
How much rainfall should be expected in Coos Bay during September?
What are the typical wind conditions in Coos Bay during September?
September rainfall patterns in Coos Bay
UV exposure in Coos Bay during September
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Where is Coos Bay?Get accurate weather forecasts for Coos Bay, located at latitude 43.367 and longitude -124.218. Stay updated with localized weather information tailored for Coos Bay.