Weather in Humboldt County, California for September 2026
Small Craft Advisory - See hour by hour.
Until now, September 2026 in Humboldt County has been nearly identical to the historical average, with a temperature of 17.4 °F (showing only a slight deviation of 0.5 °F).
The forecast for the upcoming days in Humboldt County predicts a temperature of 16.1 °F, which is slightly above the historical average.
In general, the average temperature in Humboldt County at the beginning of September is 17.6 °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 5 rainy days, Humboldt County experiences minimal rainfall in September.
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Humboldt County Weather September
Temperatures trend during September in Humboldt County
September weather in Humboldt County day by day
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Patchy rain possible | 17° /12° | 4.3 mm | 3 | |
| Sept. 2 | Patchy rain possible | 16° /12° | 22.7 mm | 3 | |
| Sept. 3 | Patchy rain possible | 17° /12° | 0.4 mm | 4 | |
| Sept. 4 | Patchy rain possible | 19° /12° | 0 mm | 6 | |
| Sept. 5 |  Sunny | 18° /12° | 0 mm | 5 | |
| Sept. 6 | Patchy rain possible | 17° /12° | 0.1 mm | 5 | |
| Sept. 7 | Patchy rain possible | 19° /12° | 0.2 mm | 3 | |
| Sept. 8 | Patchy rain possible | 20° /11° | 0 mm | 4 | |
| Sept. 9 | Patchy rain possible | 19° /12° | 0 mm | 5 | |
| Sept. 10 |  Partly cloudy | 16° /12° | 0 mm | 3 | |
| Sept. 11 | Light rain shower | 16° /11° | 0.7 mm | 3 | |
| Sept. 12 | Patchy rain possible | 16° /10° | 0.1 mm | 4 | |
| Sept. 13 | Patchy rain possible | 16° /11° | 0.4 mm | 5 | |
| Sept. 14 |  Overcast | 16° /11° | 0.9 mm | 5 | |
| Sept. 15 | Patchy rain possible | 16° /11° | 0.2 mm | 5 | |
| Sept. 16 | Patchy rain possible | 17° /11° | 0.1 mm | 5 | |
| Sept. 17 |  Fog | 15° /12° | 3.8 mm | 4 | |
| Sept. 18 | Fog | 16° /12° | 0 mm | 5 | |
| Sept. 19 | Fog | 15° /12° | 0.2 mm | 4 | |
| Sept. 20 | Mist | 16° /12° | 0.4 mm | 3 | |
| Sept. 21 | Patchy rain possible | 15° /13° | 0.4 mm | 4.7 | |
| Sept. 22 | Patchy rain possible | 15° /14° | 0.1 mm | 5.3 | |
| Sept. 23 | Sunny | 16° /12° | 0 mm | 5.8 | |
| Sept. 24 | Overcast | 17° /12° | 0 mm | 5.1 | |
| Sept. 25 | Patchy rain possible | 15° /12° | 0.4 mm | 4.8 | |
| Sept. 26 | Sunny | 15° /11° | 0 mm | 4 | |
| Sept. 27 | Patchy rain possible | 15° /10° | 0.8 mm | 4 | |
| Sept. 28 | Sunny | 15° /11° | 0 mm | 4 | |
| Sept. 29 | Overcast | 15° /11° | 0 mm | 4 | |
| Sept. 30 | Sunny | 15° /11° | 0 mm | 5 | |
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Humboldt County in September - FAQ
What are the expected maximum and minimum temperatures in Humboldt County during September?
How much rainfall should be expected in Humboldt County during September?
What are the typical wind conditions in Humboldt County during September?
September rainfall patterns in Humboldt County
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Where is Humboldt County?Get accurate weather forecasts for Humboldt County, located at latitude 40.802 and longitude -124.164. Stay updated with localized weather information tailored for Humboldt County.