Coos Bay (OR)
September
Weather in Coos Bay, Oregon for September 2025
Your guide to Coos Bay weather in September - trends and predictions
In general, the average temperature in Coos Bay at the beginning of September is 21.4 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 17.6 °F by the end of September.
With an average of 5 rainy days, Coos Bay experiences minimal rainfall in September.
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Temperatures
Rain 🌧️
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25
Dry days
5
Rainy days
0
Snow days
19°/12°
Temperatures
19 km/h
Avg max wind
86 %
Avg humidity
Coos Bay Weather September
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Temperatures trend during September in Coos Bay
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September weather in Coos Bay day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Cloudy | 18° /12° | 0 mm | 4 | |
| Sept. 2 |  Overcast | 18° /10° | 0 mm | 4 | |
| Sept. 3 |  Sunny | 22° /12° | 0 mm | 6 | |
| Sept. 4 | Sunny | 28° /13° | 0 mm | 7 | |
| Sept. 5 | Sunny | 24° /14° | 0 mm | 6 | |
| Sept. 6 | Overcast | 21° /13° | 0 mm | 5 | |
| Sept. 7 | Overcast | 19° /14° | 0 mm | 4 | |
| Sept. 8 | Cloudy | 19° /13° | 0 mm | 4 | |
| Sept. 9 | Overcast | 21° /12° | 0 mm | 5 | |
| Sept. 10 |  Partly cloudy | 18° /11° | 0.2 mm | 5 | |
| Sept. 11 |  Moderate or heavy rain shower | 17° /12° | 14.4 mm | 4 | |
| Sept. 12 |  Patchy rain possible | 17° /12° | 1.8 mm | 4 | |
| Sept. 13 | Partly cloudy | 18° /10° | 0 mm | 5 | |
| Sept. 14 | Patchy rain possible | 19° /11° | 0.2 mm | 4 | |
| Sept. 15 | Patchy rain possible | 16° /12° | 0.7 mm | 4 | |
| Sept. 16 | Sunny | 17° /10° | 0 mm | 5 | |
| Sept. 17 | Moderate or heavy rain shower | 16° /13° | 35.2 mm | 4 | |
| Sept. 18 | Overcast | 18° /12° | 2.2 mm | 4 | |
| Sept. 19 | Overcast | 17° /12° | 0 mm | 4 | |
| Sept. 20 | Partly cloudy | 18° /11° | 0 mm | 5 | |
| Sept. 21 | Partly cloudy | 18° /11° | 0 mm | 5 | |
| Sept. 22 | Overcast | 17° /10° | 0 mm | 4 | |
| Sept. 23 | Partly cloudy | 22° /13° | 0 mm | 6 | |
| Sept. 24 | Cloudy | 22° /15° | 0 mm | 5 | |
| Sept. 25 |  Heavy rain at times | 15° /13° | 4.4 mm | 4 | |
| Sept. 26 | Overcast | 17° /11° | 0 mm | 4 | |
| Sept. 27 | Overcast | 18° /13° | 0 mm | 4 | |
| Sept. 28 | Overcast | 14° /10° | 0 mm | 3 | |
| Sept. 29 | Partly cloudy | 18° /10° | 0 mm | 5 | |
| Sept. 30 | Partly cloudy | 19° /11° | 0 mm | 5 | |
| Next | |||||
Important Notice
Our weather forecast for Coos Bay 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 Coos Bay forecast closer to your planned date for the most up-to-date weather information.
Change Month
Coos Bay in September - FAQ
What are the expected maximum and minimum temperatures in Coos Bay during September?
Enjoy moderate daytime temperatures of up to 19° and cooler nights around 12°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Coos Bay during September?
Moderate rainfall is anticipated in Coos Bay during September, with a total of 59.2 mm spread over approximately 5 days. Considering plans for rainy days is advisable.
What are the typical wind conditions in Coos Bay during September?
The average wind speed in Coos Bay during September is 19 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Coos Bay
Explore the daily rainfall trends and prepare for Coos Bays September weather 💧
UV exposure in Coos Bay during September
Stay informed about UV levels for safe outdoor activities throughout the month of 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.
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