National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Extreme Heat and Excessive Rainfall Today

Dangerous and extreme heat will remain across portions of the southern U.S. through the weekend. A heat wave over the Southwest U.S. will intensify this week, peaking and expanding into the Intermountain West and northern High Plains this weekend. Multiple rounds of thunderstorms will produce heavy to excessive rainfall with significant flash flooding across portions of southern New England. Read More >

Current conditions at

Trenton-Mercer Airport (KTTN)

Lat: 40.28°NLon: 74.82°WElev: 210ft.

Light Rain

70°F

21°C

Humidity 82%
Wind Speed NW 9 mph
Barometer 29.69 in (1004.7 mb)
Dewpoint 64°F (18°C)
Visibility 10.00 mi
Last update 29 Jul 11:53 pm EDT
Extended Forecast for

Plainsboro NJ

  • Overnight

    Overnight: Scattered showers, mainly after 3am. Mostly cloudy, with a low around 61. West wind around 10 mph. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 61 °F

    Scattered
    Showers

  • Thursday

    Thursday: Isolated showers, then scattered showers and thunderstorms after 2pm. Mostly cloudy, with a high near 79. Northwest wind 10 to 15 mph. Chance of precipitation is 30%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 79 °F

    Scattered
    Showers

  • Thursday Night

    Thursday Night: Mostly cloudy, then gradually becoming clear, with a low around 61. North wind around 5 mph becoming calm after midnight.

    Low: 61 °F

    Decreasing
    Clouds

  • Friday

    Friday: Sunny, with a high near 83. Northwest wind around 5 mph becoming calm in the afternoon.

    High: 83 °F

    Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 63. South wind around 5 mph becoming calm after midnight.

    Low: 63 °F

    Partly Cloudy

  • Saturday

    Saturday: Partly sunny, with a high near 85.

    High: 85 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 65.

    Low: 65 °F

    Mostly Cloudy

  • Sunday

    Sunday: A chance of showers after 2pm. Mostly cloudy, with a high near 83. Chance of precipitation is 30%.

    High: 83 °F

    Mostly Cloudy
    then Chance
    Showers

  • Sunday Night

    Sunday Night: A chance of showers. Mostly cloudy, with a low around 65. Chance of precipitation is 50%.

    Low: 65 °F

    Chance
    Showers

Detailed Forecast

Overnight
Scattered showers, mainly after 3am. Mostly cloudy, with a low around 61. West wind around 10 mph. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.
Thursday
Isolated showers, then scattered showers and thunderstorms after 2pm. Mostly cloudy, with a high near 79. Northwest wind 10 to 15 mph. Chance of precipitation is 30%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Thursday Night
Mostly cloudy, then gradually becoming clear, with a low around 61. North wind around 5 mph becoming calm after midnight.
Friday
Sunny, with a high near 83. Northwest wind around 5 mph becoming calm in the afternoon.
Friday Night
Partly cloudy, with a low around 63. South wind around 5 mph becoming calm after midnight.
Saturday
Partly sunny, with a high near 85.
Saturday Night
Mostly cloudy, with a low around 65.
Sunday
A chance of showers after 2pm. Mostly cloudy, with a high near 83. Chance of precipitation is 30%.
Sunday Night
A chance of showers. Mostly cloudy, with a low around 65. Chance of precipitation is 50%.
Monday
A chance of showers, with thunderstorms also possible after 2pm. Partly sunny, with a high near 82. Chance of precipitation is 40%.
Monday Night
A chance of thunderstorms. Partly cloudy, with a low around 65. Chance of precipitation is 30%.
Tuesday
Mostly sunny, with a high near 85.
Tuesday Night
Mostly clear, with a low around 64.
Wednesday
Sunny, with a high near 86.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Plainsboro NJ
 40.33°N 74.56°W (Elev. 98 ft)
Last Update:
3:20 pm EDT Jul 29, 2026
Forecast Valid:
12am EDT Jul 30, 2026-6pm EDT Aug 5, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation