Weather in Passaic County, New Jersey for September 2025
Rip Current Statement - See hour by hour.
Until now, September 2025 in Passaic County is cooler than usual, with temperatures averaging 24.6 °F, this is -2.3 °F below the typical seasonal average.
The forecast for the next days in Passaic County predicts temperatures to be around 26 °F, close to the historical average.
In general, the average temperature in Passaic County at the beginning of September is 27.7 °F. As the month progressed, temperatures tended to moderately fall, reaching an average of 26.6 °F by the end of September.
Passaic County in September brings notable rainfall, with an average of 18 rainy days and a total precipitation of 181.3 mm.
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Passaic County Weather September
Temperatures trend during September in Passaic County
September weather in Passaic County day by day
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Sunny | 26° /16° | 1 mm | 6 | |
| Sept. 2 |  Partly cloudy | 28° /15° | 0 mm | 7 | |
| Sept. 3 | Partly cloudy | 27° /14° | 0 mm | 7 | |
| Sept. 4 |  Thundery outbreaks possible | 29° /17° | 0 mm | 7 | |
| Sept. 5 | Partly cloudy | 30° /18° | 14.2 mm | 7 | |
| Sept. 6 | Partly cloudy | 30° /19° | 3.7 mm | 7 | |
| Sept. 7 | Thundery outbreaks possible | 24° /16° | 35.6 mm | 6 | |
| Sept. 8 |  Light rain shower | 26° /14° | 2.4 mm | 6 | |
| Sept. 9 | Partly cloudy | 25° /15° | 3.8 mm | 6 | |
| Sept. 10 | Light rain shower | 25° /16° | 3.9 mm | 6 | |
| Sept. 11 | Light rain shower | 27° /15° | 2 mm | 7 | |
| Sept. 12 |  Mist | 27° /16° | 0 mm | 6 | |
| Sept. 13 |  Moderate or heavy rain shower | 25° /16° | 8.7 mm | 6 | |
| Sept. 14 |  Cloudy | 27° /16° | 0.9 mm | 6 | |
| Sept. 15 |  Overcast | 24° /15° | 9.1 mm | 6 | |
| Sept. 16 | Cloudy | 26° /18° | 0 mm | 1.3 | |
| Sept. 17 |  Moderate rain | 17° /16° | 5.5 mm | 1.1 | |
| Sept. 18 | Cloudy | 28° /17° | 0 mm | 1.4 | |
| Sept. 19 | Sunny | 29° /19° | 0 mm | 1.4 | |
| Sept. 20 | Sunny | 23° /12° | 0 mm | 0 | |
| Sept. 21 | Sunny | 23° /14° | 0 mm | 5 | |
| Sept. 22 | Sunny | 26° /13° | 0 mm | 5 | |
| Sept. 23 | Sunny | 30° /15° | 0 mm | 6 | |
| Sept. 24 | Partly cloudy | 30° /18° | 0 mm | 6 | |
| Sept. 25 | Patchy rain possible | 29° /20° | 1.6 mm | 5 | |
| Sept. 26 | Sunny | 25° /18° | 0 mm | 6 | |
| Sept. 27 | Sunny | 27° /15° | 0 mm | 5 | |
| Sept. 28 | Sunny | 26° /13° | 0 mm | 5 | |
| Sept. 29 | Sunny | 30° /16° | 0 mm | 6 | |
| Sept. 30 |  Light rain | 19° /14° | 8.9 mm | 4 | |
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Passaic County in September - FAQ
September rainfall patterns in Passaic County
UV exposure in Passaic County during September
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Where is Passaic County?Get accurate weather forecasts for Passaic County, located at latitude 40.917 and longitude -74.172. Stay updated with localized weather information tailored for Passaic County.