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.

Overcast

58°F

14°C

Humidity 90%
Wind Speed NW 7 mph
Barometer 29.75 in (1006.9 mb)
Dewpoint 55°F (13°C)
Visibility 10.00 mi
Last update 27 Mar 5:53 am EDT
Extended Forecast for

Monmouth Junction NJ

  • Today

    Today: Rain likely before 1pm, then a slight chance of rain after 3pm. Mostly cloudy, with a temperature falling to around 51 by 11am. North wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 54 °F⇓

    Rain Likely
    then Slight
    Chance Rain

  • Tonight

    Tonight: Mostly cloudy, with a low around 29. Calm wind becoming north around 5 mph after midnight.

    Low: 29 °F

    Mostly Cloudy

  • Saturday

    Saturday: Sunny, with a high near 43. Northwest wind 10 to 15 mph.

    High: 43 °F

    Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 25. Northwest wind around 5 mph becoming calm in the evening.

    Low: 25 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 55. Light south wind becoming southwest 5 to 10 mph in the morning. Winds could gust as high as 20 mph.

    High: 55 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 41.

    Low: 41 °F

    Partly Cloudy

  • Monday

    Monday: Partly sunny, with a high near 63.

    High: 63 °F

    Partly Sunny

  • Monday Night

    Monday Night: A chance of showers after 2am. Mostly cloudy, with a low around 46. Chance of precipitation is 30%.

    Low: 46 °F

    Mostly Cloudy
    then Chance
    Showers

  • Tuesday

    Tuesday: A chance of showers. Mostly cloudy, with a high near 67. Chance of precipitation is 30%.

    High: 67 °F

    Chance
    Showers

Detailed Forecast

Today
Rain likely before 1pm, then a slight chance of rain after 3pm. Mostly cloudy, with a temperature falling to around 51 by 11am. North wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.
Tonight
Mostly cloudy, with a low around 29. Calm wind becoming north around 5 mph after midnight.
Saturday
Sunny, with a high near 43. Northwest wind 10 to 15 mph.
Saturday Night
Partly cloudy, with a low around 25. Northwest wind around 5 mph becoming calm in the evening.
Sunday
Mostly sunny, with a high near 55. Light south wind becoming southwest 5 to 10 mph in the morning. Winds could gust as high as 20 mph.
Sunday Night
Partly cloudy, with a low around 41.
Monday
Partly sunny, with a high near 63.
Monday Night
A chance of showers after 2am. Mostly cloudy, with a low around 46. Chance of precipitation is 30%.
Tuesday
A chance of showers. Mostly cloudy, with a high near 67. Chance of precipitation is 30%.
Tuesday Night
A chance of showers. Mostly cloudy, with a low around 53. Chance of precipitation is 30%.
Wednesday
A chance of showers. Partly sunny, with a high near 77. Chance of precipitation is 30%.
Wednesday Night
A chance of showers. Mostly cloudy, with a low around 56. Chance of precipitation is 40%.
Thursday
A chance of showers. Mostly cloudy, with a high near 74. Chance of precipitation is 30%.
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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:
4:10 am EDT Mar 27, 2026
Forecast Valid:
6am EDT Mar 27, 2026-6pm EDT Apr 2, 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