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

23°F

-5°C

Humidity 74%
Wind Speed W 8 mph
Barometer 29.87 in (1011.0 mb)
Dewpoint 16°F (-9°C)
Visibility NA
Wind Chill14°F (-10°C)
Last update 19 Jan 12:53 am EST
Extended Forecast for

Monmouth Junction NJ

  • Overnight

    Overnight: Partly cloudy, with a low around 18. West wind 5 to 10 mph.

    Low: 18 °F

    Partly Cloudy

  • M.L.King Day

    M.L.King Day: Mostly sunny, with a high near 34. Southwest wind 5 to 15 mph.

    High: 34 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 13. West wind 10 to 15 mph.

    Low: 13 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 22. West wind 10 to 15 mph, with gusts as high as 25 mph.

    High: 22 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 5. West wind around 5 mph becoming calm in the evening.

    Low: 5 °F

    Mostly Clear

  • Wednesday

    Wednesday: Mostly sunny, with a high near 32.

    High: 32 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 24.

    Low: 24 °F

    Mostly Cloudy

  • Thursday

    Thursday: A chance of rain and snow after 1pm. Partly sunny, with a high near 39. Chance of precipitation is 30%.

    High: 39 °F

    Partly Sunny
    then Chance
    Rain/Snow

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 16.

    Low: 16 °F

    Mostly Clear

Detailed Forecast

Overnight
Partly cloudy, with a low around 18. West wind 5 to 10 mph.
M.L.King Day
Mostly sunny, with a high near 34. Southwest wind 5 to 15 mph.
Monday Night
Mostly clear, with a low around 13. West wind 10 to 15 mph.
Tuesday
Sunny, with a high near 22. West wind 10 to 15 mph, with gusts as high as 25 mph.
Tuesday Night
Mostly clear, with a low around 5. West wind around 5 mph becoming calm in the evening.
Wednesday
Mostly sunny, with a high near 32.
Wednesday Night
Mostly cloudy, with a low around 24.
Thursday
A chance of rain and snow after 1pm. Partly sunny, with a high near 39. Chance of precipitation is 30%.
Thursday Night
Mostly clear, with a low around 16.
Friday
Mostly sunny, with a high near 30.
Friday Night
Partly cloudy, with a low around 16.
Saturday
A chance of snow. Partly sunny, with a high near 29. Chance of precipitation is 30%.
Saturday Night
A chance of snow. Mostly cloudy, with a low around 12. Chance of precipitation is 30%.
Sunday
A chance of snow. Partly sunny, with a high near 22. Chance of precipitation is 40%.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Monmouth Junction NJ
 40.38°N 74.55°W (Elev. 98 ft)
Last Update:
8:03 pm EST Jan 18, 2026
Forecast Valid:
1am EST Jan 19, 2026-6pm EST Jan 25, 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