New Jersey is about to ride a classic early September weather rollercoaster: warmer days with building humidity midweek, a pair of frontal rainmakers late in the week, and then a crisp cooldown to wrap up the weekend.
The pattern begins with a pleasant stretch of dry, comfortable weather through midweek. But by Thursday, a southerly flow will draw in warmer, stickier air across the Garden State, peaking in heat and humidity between Thursday night and Saturday morning. After that, a strong frontal system ushers in below-average temperatures and refreshing air starting Sunday, carrying through mid-September.
Get the latest New Jersey weather updates here.
The Big Picture
A surface low and upper-level trough spinning north of the Great Lakes is driving this week’s setup. That system tugs a warm sector northward into the Mid-Atlantic, pushing New Jersey into a short-lived stretch of warmer, more humid weather.
- Tuesday–Wednesday: Comfortable, dry, and mild.
- Thursday–Saturday: Warmer and increasingly humid with chances for rain and thunderstorms.
- Sunday–Next Week: Cooler, drier air settles in, with daytime highs in the 70s and nighttime lows dipping into the 40s and 50s.
Importantly, the upcoming frontal systems don’t appear to pose a flash flooding threat. Rain will favor northwestern New Jersey more than the coastal southeast, with showers weakening as they approach the shoreline.
Day-by-Day Forecast
Tuesday, September 2
- Highs: Mid-to-upper 70s
- Lows: 48–58 (cooler north, milder at the Shore)
- Conditions: Mostly sunny skies with that classic early fall “pleasant feel.” Light east-northeast breezes.
Wednesday, September 3
- Highs: 75–83 (with the I-95 corridor most likely to top 80)
- Lows: 50–60
- Conditions: Sun dominates with a few clouds around. Humidity stays low, keeping the day comfortable. Winds remain light from the east.
Thursday, September 4
- Highs: 78–85
- Lows: 60–70
- Conditions: Morning sun gives way to clouds. Showers or thunderstorms possible by evening as humidity climbs. Winds out of the south-southeast.
Friday, September 5
- Highs: 82–88
- Lows: 60–70
- Conditions: A warmer, muggy day with a mix of sun, clouds, and scattered showers. Winds from the south-southwest may become breezy. Overnight remains humid with isolated showers.
Saturday, September 6 – Sunday, September 7
- Saturday: Warm and humid, unsettled with scattered rain or thunderstorms.
- Sunday: Cold front clears the region, delivering cooler, drier air. Highs settle back into the 70s, setting the stage for a refreshingly fall-like week ahead.
Looking Ahead: September 8–15
Following Sunday’s frontal passage, New Jersey can expect an extended stretch of cooler, drier weather. Daytime highs will stay comfortably in the 70s, while nights dip into the 45–55 range—ideal sleeping weather and a hint of fall on the horizon. Rain chances look minimal during this period, and skies should trend mostly clear.
Tropics Update
The Atlantic hurricane basin remains quiet for New Jersey this week. However, forecasters are monitoring conditions that could bring a Cape Verde-origin tropical system into play next week. It’s too soon for specifics, but September is peak hurricane season, so it’s something to keep an eye on.
The Bottom Line
New Jersey’s weather this week will shift from pleasant and dry to warmer, humid, and unsettled, before finally flipping to cooler, crisp September air by Sunday. With no major flooding threats expected, it’s a manageable week weather-wise—just be prepared for changing conditions if you have outdoor plans from Thursday through Saturday.
