Eureka (CA)
September
Weather in Eureka, California for September 2025
Your guide to Eureka weather in September - trends and predictions
In general, the average temperature in Eureka at the beginning of September is 18.3 °F. As the month progressed, temperatures tended to noticeably cool down, reaching an average of 15.3 °F by the end of September.
With an average of 2 rainy days, Eureka experiences minimal rainfall in September.
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Temperatures
Rain 🌧️
More
28
Dry days
2
Rainy days
0
Snow days
17°/11°
Temperatures
13 km/h
Avg max wind
84 %
Avg humidity
Eureka Weather September
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Temperatures trend during September in Eureka
See the weather trend as well as the moving average line
September weather in Eureka day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Patchy rain possible | 16° /11° | 0.1 mm | 4 | |
| Sept. 2 | Patchy rain possible | 16° /10° | 0 mm | 4 | |
| Sept. 3 | Patchy rain possible | 18° /11° | 0 mm | 4 | |
| Sept. 4 | Patchy rain possible | 20° /14° | 0 mm | 5 | |
| Sept. 5 |  Sunny | 21° /14° | 0 mm | 6 | |
| Sept. 6 | Patchy rain possible | 19° /13° | 0.2 mm | 4 | |
| Sept. 7 | Patchy rain possible | 18° /12° | 0.4 mm | 4 | |
| Sept. 8 | Patchy rain possible | 18° /11° | 0.1 mm | 4 | |
| Sept. 9 | Patchy rain possible | 18° /12° | 0.1 mm | 4 | |
| Sept. 10 |  Partly cloudy | 17° /11° | 0.1 mm | 5 | |
| Sept. 11 | Light rain shower | 16° /10° | 2.1 mm | 4 | |
| Sept. 12 | Patchy rain possible | 16° /10° | 0 mm | 4 | |
| Sept. 13 | Patchy rain possible | 17° /11° | 0 mm | 4 | |
| Sept. 14 |  Overcast | 16° /11° | 0 mm | 4 | |
| Sept. 15 | Patchy rain possible | 15° /11° | 0.6 mm | 4 | |
| Sept. 16 | Patchy rain possible | 16° /10° | 0.2 mm | 4 | |
| Sept. 17 |  Fog | 13° /12° | 11.4 mm | 3 | |
| Sept. 18 | Fog | 15° /12° | 0 mm | 4 | |
| Sept. 19 | Fog | 15° /12° | 0 mm | 4 | |
| Sept. 20 | Mist | 17° /11° | 0 mm | 4 | |
| Sept. 21 | Partly cloudy | 17° /12° | 0 mm | 5 | |
| Sept. 22 | Partly cloudy | 15° /11° | 0 mm | 5 | |
| Sept. 23 | Partly cloudy | 19° /12° | 0 mm | 5 | |
| Sept. 24 |  Cloudy | 18° /13° | 0 mm | 4 | |
| Sept. 25 | Mist | 13° /11° | 0 mm | 3 | |
| Sept. 26 | Fog | 12° /10° | 0 mm | 3 | |
| Sept. 27 | Mist | 16° /10° | 0 mm | 4 | |
| Sept. 28 | Mist | 12° /10° | 0 mm | 3 | |
| Sept. 29 | Mist | 17° /10° | 0 mm | 4 | |
| Sept. 30 | Sunny | 19° /12° | 0 mm | 5 | |
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Important Notice
Our weather forecast for Eureka 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 Eureka forecast closer to your planned date for the most up-to-date weather information.
Change Month
Eureka in September - FAQ
What are the expected maximum and minimum temperatures in Eureka during September?
Enjoy moderate daytime temperatures of up to 17° and cooler nights around 11°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Eureka during September?
Expect minimal rainfall in Eureka during September, with a total of 15.5 mm over approximately 2 days. This minimal precipitation is unlikely to significantly impact plans.
What are the typical wind conditions in Eureka during September?
The average wind speed in Eureka during September is 13 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Eureka
Explore the daily rainfall trends and prepare for Eurekas September weather 💧
UV exposure in Eureka during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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