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

Trenton-Mercer Airport (KTTN)

Lat: 40.28°NLon: 74.82°WElev: 210ft.

Fair

59°F

15°C

Humidity 46%
Wind Speed S 10 mph
Barometer 30.23 in (1023.0 mb)
Dewpoint 38°F (3°C)
Visibility 10.00 mi
Last update 27 Apr 7:53 pm EDT
Extended Forecast for

Monmouth Junction NJ

  • Tonight

    Tonight: Mostly clear, with a low around 40. Southeast wind around 5 mph becoming calm.

    Low: 40 °F

    Mostly Clear

  • Tuesday

    Tuesday: Increasing clouds, with a high near 68. Calm wind becoming southeast around 5 mph in the afternoon.

    High: 68 °F

    Increasing
    Clouds

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 48. Southeast wind around 5 mph becoming calm.

    Low: 48 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: A chance of showers after 2pm. Mostly cloudy, with a high near 66. Light southeast wind increasing to 5 to 10 mph in the afternoon. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.

    High: 66 °F

    Mostly Cloudy
    then Chance
    Showers

  • Wednesday Night

    Wednesday Night: A chance of showers and thunderstorms before 8pm, then showers and possibly a thunderstorm between 8pm and 2am, then showers after 2am. Low around 47. Southeast wind around 5 mph. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.

    Low: 47 °F

    Showers

  • Thursday

    Thursday: A chance of showers before 2pm. Mostly cloudy, with a high near 60. Chance of precipitation is 30%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 60 °F

    Chance
    Showers

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 40.

    Low: 40 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 61.

    High: 61 °F

    Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 42.

    Low: 42 °F

    Partly Cloudy

Detailed Forecast

Tonight
Mostly clear, with a low around 40. Southeast wind around 5 mph becoming calm.
Tuesday
Increasing clouds, with a high near 68. Calm wind becoming southeast around 5 mph in the afternoon.
Tuesday Night
Mostly cloudy, with a low around 48. Southeast wind around 5 mph becoming calm.
Wednesday
A chance of showers after 2pm. Mostly cloudy, with a high near 66. Light southeast wind increasing to 5 to 10 mph in the afternoon. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.
Wednesday Night
A chance of showers and thunderstorms before 8pm, then showers and possibly a thunderstorm between 8pm and 2am, then showers after 2am. Low around 47. Southeast wind around 5 mph. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.
Thursday
A chance of showers before 2pm. Mostly cloudy, with a high near 60. Chance of precipitation is 30%. New precipitation amounts between a tenth and quarter of an inch possible.
Thursday Night
Mostly clear, with a low around 40.
Friday
Sunny, with a high near 61.
Friday Night
Partly cloudy, with a low around 42.
Saturday
Partly sunny, with a high near 58.
Saturday Night
Partly cloudy, with a low around 39.
Sunday
Mostly sunny, with a high near 60.
Sunday Night
Partly cloudy, with a low around 42.
Monday
Mostly sunny, with a high near 68.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Monmouth Junction NJ
 40.38°N 74.55°W (Elev. 98 ft)
Last Update:
4:08 pm EDT Apr 27, 2026
Forecast Valid:
8pm EDT Apr 27, 2026-6pm EDT May 4, 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