Weather in Somerset County, New Jersey for September 2025
Rip Current Statement - See hour by hour.
Until now, September 2025 in Somerset County has been nearly identical to the historical average, with a temperature of 24.5 °F (showing only a slight deviation of -0.5 °F).
Expect cooler weather in the next days in Somerset County with the forecast suggesting a temperature of 23.9 °F, lower than the historical average.
In general, the average temperature in Somerset County at the beginning of September is 25.1 °F. As the month progressed, temperatures tended to moderately fall, reaching an average of 23.6 °F by the end of September.
Somerset County experiences moderate rainfall in September, with an average of 9 rainy days and a total precipitation of 54.7 mm.
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Somerset County Weather September
Temperatures trend during September in Somerset County
September weather in Somerset County day by day
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Heavy rain at times | 26° /18° | 1.2 mm | 6 | |
| Sept. 2 |  Patchy rain possible | 26° /16° | 0.2 mm | 7 | |
| Sept. 3 |  Sunny | 24° /12° | 0 mm | 6 | |
| Sept. 4 | Sunny | 25° /13° | 0 mm | 6 | |
| Sept. 5 | Sunny | 27° /15° | 34.8 mm | 6 | |
| Sept. 6 |  Overcast | 28° /17° | 6.5 mm | 6 | |
| Sept. 7 |  Moderate or heavy rain shower | 20° /13° | 52.4 mm | 5 | |
| Sept. 8 | Sunny | 22° /10° | 0 mm | 6 | |
| Sept. 9 |  Partly cloudy | 23° /11° | 0 mm | 6 | |
| Sept. 10 | Sunny | 23° /14° | 0 mm | 6 | |
| Sept. 11 | Sunny | 26° /14° | 0 mm | 7 | |
| Sept. 12 | Sunny | 26° /15° | 0 mm | 7 | |
| Sept. 13 | Sunny | 26° /15° | 2 mm | 6 | |
| Sept. 14 | Sunny | 28° /15° | 0 mm | 7 | |
| Sept. 15 | Patchy rain possible | 26° /16° | 0.1 mm | 6 | |
| Sept. 16 | Partly cloudy | 23° /15° | 0 mm | 6 | |
| Sept. 17 | Overcast | 19° /16° | 0 mm | 0.3 | |
| Sept. 18 | Partly cloudy | 29° /18° | 0 mm | 1.1 | |
| Sept. 19 | Sunny | 25° /17° | 0 mm | 1.4 | |
| Sept. 20 | Sunny | 23° /12° | 0 mm | 1.4 | |
| Sept. 21 | Sunny | 22° /13° | 0 mm | 0 | |
| Sept. 22 | Partly cloudy | 24° /14° | 0 mm | 5 | |
| Sept. 23 |  Cloudy | 27° /16° | 0 mm | 5 | |
| Sept. 24 | Partly cloudy | 26° /17° | 0 mm | 6 | |
| Sept. 25 | Sunny | 28° /16° | 0 mm | 6 | |
| Sept. 26 | Patchy rain possible | 28° /19° | 2.9 mm | 5 | |
| Sept. 27 |  Moderate rain | 23° /18° | 6.4 mm | 5 | |
| Sept. 28 | Patchy rain possible | 20° /18° | 3.4 mm | 4 | |
| Sept. 29 | Patchy rain possible | 20° /17° | 0.4 mm | 4 | |
| Sept. 30 | Patchy rain possible | 20° /18° | 2.9 mm | 4 | |
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Somerset County in September - FAQ
September rainfall patterns in Somerset County
UV exposure in Somerset County during September
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Where is Somerset County?Get accurate weather forecasts for Somerset County, located at latitude 40.601 and longitude -74.648. Stay updated with localized weather information tailored for Somerset County.