Weather in Washington County, Utah for September 2026
Extreme Heat Warning - See hour by hour.
Until now, September 2026 in Washington County has been significantly warmer than historical averages.
The forecast for the upcoming days in Washington County predicts a temperature of 28.9 °F, which is slightly above the historical average.
In general, the average temperature in Washington County at the beginning of September is 27 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 21.4 °F by the end of September.
Washington County experiences moderate rainfall in September, with an average of 9 rainy days and a total precipitation of 46 mm.
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Washington County Weather September
Temperatures trend during September in Washington County
September weather in Washington County day by day
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Sunny | 28° /17° | 0.2 mm | 7 | |
| Sept. 2 | Sunny | 28° /18° | 0 mm | 7 | |
| Sept. 3 |  Patchy rain possible | 28° /17° | 0.1 mm | 7 | |
| Sept. 4 |  Partly cloudy | 28° /17° | 0 mm | 7 | |
| Sept. 5 | Sunny | 27° /16° | 11.3 mm | 7 | |
| Sept. 6 | Sunny | 24° /14° | 9.4 mm | 5 | |
| Sept. 7 | Patchy rain possible | 26° /15° | 0 mm | 6 | |
| Sept. 8 | Sunny | 27° /16° | 0.8 mm | 7 | |
| Sept. 9 | Sunny | 35° /21° | 0 mm | 9.1 | |
| Sept. 10 | Sunny | 31° /20° | 0 mm | 9.1 | |
| Sept. 11 | Sunny | 30° /19° | 0.7 mm | 9 | |
| Sept. 12 | Sunny | 29° /19° | 0 mm | 7.4 | |
| Sept. 13 | Sunny | 27° /17° | 0 mm | 7 | |
| Sept. 14 | Sunny | 28° /17° | 0 mm | 7 | |
| Sept. 15 | Sunny | 27° /17° | 0 mm | 7 | |
| Sept. 16 | Sunny | 28° /19° | 0 mm | 7 | |
| Sept. 17 | Patchy rain possible | 29° /18° | 1.5 mm | 7 | |
| Sept. 18 | Patchy rain possible | 27° /18° | 7.4 mm | 6 | |
| Sept. 19 | Patchy rain possible | 25° /19° | 6.6 mm | 6 | |
| Sept. 20 | Sunny | 28° /18° | 0 mm | 7 | |
| Sept. 21 | Sunny | 29° /19° | 0 mm | 7 | |
| Sept. 22 | Sunny | 31° /19° | 0 mm | 8 | |
| Sept. 23 | Sunny | 22° /11° | 0 mm | 6 | |
| Sept. 24 | Sunny | 23° /10° | 0 mm | 6 | |
| Sept. 25 | Sunny | 23° /13° | 7.7 mm | 6 | |
| Sept. 26 | Sunny | 21° /13° | 1 mm | 5 | |
| Sept. 27 | Sunny | 21° /12° | 10 mm | 6 | |
| Sept. 28 | Sunny | 19° /11° | 1.8 mm | 5 | |
| Sept. 29 | Sunny | 21° /12° | 0 mm | 6 | |
| Sept. 30 | Sunny | 22° /15° | 0 mm | 6 | |
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Washington County in September - FAQ
What are the expected maximum and minimum temperatures in Washington County during September?
How much rainfall should be expected in Washington County during September?
What are the typical wind conditions in Washington County during September?
September rainfall patterns in Washington County
UV exposure in Washington County during September
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Where is Washington County?Get accurate weather forecasts for Washington County, located at latitude 37.298 and longitude -113.026. Stay updated with localized weather information tailored for Washington County.