Weather in Passaic County, New Jersey for September 2026
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Until now, September 2026 in Passaic County has been nearly identical to the historical average, with a temperature of 25.4 °F (showing only a slight deviation of 0.3 °F).
The forecast for the upcoming days in Passaic County predicts a temperature of 18.8 °F, which is slightly above the historical average.
In general, the average temperature in Passaic County at the beginning of September is 28 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 19.6 °F by the end of September.
Passaic County experiences heavy rainfall in September, with over 20 rainy days and an average total precipitation 226 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 | 28° /17° | 47.1 mm | 5 | |
| Sept. 2 |  Partly cloudy | 26° /16° | 1.4 mm | 5 | |
| Sept. 3 | Partly cloudy | 28° /15° | 0.9 mm | 6 | |
| Sept. 4 | Sunny | 29° /18° | 0 mm | 7 | |
| Sept. 5 | Sunny | 30° /18° | 10.7 mm | 8 | |
| Sept. 6 | Partly cloudy | 29° /18° | 2.8 mm | 7 | |
| Sept. 7 |  Thundery outbreaks possible | 26° /15° | 26.7 mm | 6 | |
| Sept. 8 | Sunny | 27° /14° | 1.8 mm | 7 | |
| Sept. 9 | Partly cloudy | 26° /15° | 2.9 mm | 5 | |
| Sept. 10 |  Light rain shower | 26° /17° | 3 mm | 5 | |
| Sept. 11 | Light rain shower | 27° /16° | 1.5 mm | 7 | |
| Sept. 12 |  Mist | 27° /15° | 0 mm | 6 | |
| Sept. 13 |  Moderate or heavy rain shower | 25° /16° | 17.3 mm | 5 | |
| Sept. 14 |  Cloudy | 26° /15° | 0.7 mm | 6 | |
| Sept. 15 |  Overcast | 24° /14° | 6.8 mm | 6 | |
| Sept. 16 | Overcast | 25° /14° | 0 mm | 6 | |
| Sept. 17 | Overcast | 24° /16° | 0.9 mm | 5 | |
| Sept. 18 | Mist | 24° /17° | 4.7 mm | 6 | |
| Sept. 19 | Overcast | 24° /16° | 1.4 mm | 5 | |
| Sept. 20 | Sunny | 22° /13° | 3.4 mm | 5 | |
| Sept. 21 | Overcast | 22° /13° | 0.5 mm | 4 | |
| Sept. 22 | Patchy rain possible | 22° /13° | 1 mm | 4 | |
| Sept. 23 | Overcast | 21° /13° | 10.5 mm | 4 | |
| Sept. 24 | Overcast | 20° /13° | 2.7 mm | 5 | |
| Sept. 25 |  Moderate rain | 20° /14° | 30.8 mm | 4 | |
| Sept. 26 | Patchy rain possible | 24° /16° | 14.1 mm | 5 | |
| Sept. 27 | Light rain shower | 16° /12° | 29 mm | 1.1 | |
| Sept. 28 | Light rain shower | 15° /13° | 14 mm | 0.6 | |
| Sept. 29 | Overcast | 18° /12° | 0.1 mm | 3.2 | |
| Sept. 30 | Smoky haze | 24° /16° | 0 mm | 5.4 | |
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Passaic County in September - FAQ
What are the expected maximum and minimum temperatures in Passaic County during September?
How much rainfall should be expected in Passaic County during September?
What are the typical wind conditions in Passaic County during September?
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.