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

46°F

8°C

Humidity 40%
Wind Speed SW 8 mph
Barometer 30.02 in (1016.0 mb)
Dewpoint 23°F (-5°C)
Visibility 10.00 mi
Wind Chill42°F (6°C)
Last update 13 Jan 11:53 am EST
Extended Forecast for

Monmouth Junction NJ

  • This Afternoon

    This Afternoon: Increasing clouds, with a high near 48. South wind 5 to 10 mph.

    High: 48 °F

    Increasing
    Clouds

  • Tonight

    Tonight: A slight chance of rain after 1am. Mostly cloudy, with a low around 37. Southwest wind 5 to 10 mph. Chance of precipitation is 20%.

    Low: 37 °F

    Mostly Cloudy
    then Slight
    Chance Rain

  • Wednesday

    Wednesday: A slight chance of rain after 1pm. Cloudy, with a high near 50. Southwest wind around 5 mph. Chance of precipitation is 20%.

    High: 50 °F

    Mostly Cloudy
    then Slight
    Chance Rain

  • Wednesday Night

    Wednesday Night: Rain likely before 4am, then rain and snow likely. Cloudy, with a low around 28. South wind 5 to 10 mph becoming west after midnight. Winds could gust as high as 25 mph. Chance of precipitation is 60%. Little or no snow accumulation expected.

    Low: 28 °F

    Chance Rain
    then
    Rain/Snow
    Likely

  • Thursday

    Thursday: Rain and snow likely before 10am, then a slight chance of rain between 10am and 1pm. Partly sunny, with a high near 34. West wind around 15 mph, with gusts as high as 30 mph. Chance of precipitation is 60%. Little or no snow accumulation expected.

    High: 34 °F

    Rain/Snow
    Likely then
    Slight Chance
    Rain

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 15.

    Low: 15 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 32.

    High: 32 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 24.

    Low: 24 °F

    Partly Cloudy

  • Saturday

    Saturday: Partly sunny, with a high near 42.

    High: 42 °F

    Partly Sunny

Detailed Forecast

This Afternoon
Increasing clouds, with a high near 48. South wind 5 to 10 mph.
Tonight
A slight chance of rain after 1am. Mostly cloudy, with a low around 37. Southwest wind 5 to 10 mph. Chance of precipitation is 20%.
Wednesday
A slight chance of rain after 1pm. Cloudy, with a high near 50. Southwest wind around 5 mph. Chance of precipitation is 20%.
Wednesday Night
Rain likely before 4am, then rain and snow likely. Cloudy, with a low around 28. South wind 5 to 10 mph becoming west after midnight. Winds could gust as high as 25 mph. Chance of precipitation is 60%. Little or no snow accumulation expected.
Thursday
Rain and snow likely before 10am, then a slight chance of rain between 10am and 1pm. Partly sunny, with a high near 34. West wind around 15 mph, with gusts as high as 30 mph. Chance of precipitation is 60%. Little or no snow accumulation expected.
Thursday Night
Partly cloudy, with a low around 15.
Friday
Mostly sunny, with a high near 32.
Friday Night
Partly cloudy, with a low around 24.
Saturday
Partly sunny, with a high near 42.
Saturday Night
Mostly cloudy, with a low around 24.
Sunday
Mostly sunny, with a high near 35.
Sunday Night
Partly cloudy, with a low around 19.
M.L.King Day
Mostly sunny, with a high near 31.
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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 EST Jan 13, 2026
Forecast Valid:
12pm EST Jan 13, 2026-6pm EST Jan 19, 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