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.

Light Rain

41°F

5°C

Humidity 82%
Wind Speed NW 8 G 25 mph
Barometer 29.80 in (1008.6 mb)
Dewpoint 36°F (2°C)
Visibility 7.00 mi
Wind Chill36°F (2°C)
Last update 12 Mar 10:53 am EDT
Extended Forecast for

Princeton Junction NJ

  • Today

    Today: Rain before 5pm, then rain and snow. Temperature falling to around 36 by 4pm. Breezy, with a northwest wind 15 to 20 mph, with gusts as high as 35 mph. Chance of precipitation is 90%. Total daytime snow accumulation of less than a half inch possible.

    High: 57 °F⇓

    Rain/Snow and
    Breezy

  • Tonight

    Tonight: A chance of rain and snow, mainly before 7pm. Mostly cloudy, then gradually becoming mostly clear, with a low around 29. West wind 5 to 10 mph. Chance of precipitation is 30%. New snow accumulation of less than a half inch possible.

    Low: 29 °F

    Chance
    Rain/Snow
    then Mostly
    Clear

  • Friday

    Friday: Mostly sunny, with a high near 49. Light southwest wind becoming south 10 to 15 mph in the morning.

    High: 49 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 38. South wind around 10 mph, with gusts as high as 20 mph.

    Low: 38 °F

    Partly Cloudy

  • Saturday

    Saturday: Sunny, with a high near 53. West wind 10 to 15 mph.

    High: 53 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 34.

    Low: 34 °F

    Mostly Cloudy

  • Sunday

    Sunday: Cloudy, with a high near 53.

    High: 53 °F

    Cloudy

  • Sunday Night

    Sunday Night: Rain, mainly after 2am. Low around 45. Chance of precipitation is 80%.

    Low: 45 °F

    Chance Rain
    then Rain

  • Monday

    Monday: Rain. High near 65. Chance of precipitation is 90%.

    High: 65 °F

    Rain

Detailed Forecast

Today
Rain before 5pm, then rain and snow. Temperature falling to around 36 by 4pm. Breezy, with a northwest wind 15 to 20 mph, with gusts as high as 35 mph. Chance of precipitation is 90%. Total daytime snow accumulation of less than a half inch possible.
Tonight
A chance of rain and snow, mainly before 7pm. Mostly cloudy, then gradually becoming mostly clear, with a low around 29. West wind 5 to 10 mph. Chance of precipitation is 30%. New snow accumulation of less than a half inch possible.
Friday
Mostly sunny, with a high near 49. Light southwest wind becoming south 10 to 15 mph in the morning.
Friday Night
Partly cloudy, with a low around 38. South wind around 10 mph, with gusts as high as 20 mph.
Saturday
Sunny, with a high near 53. West wind 10 to 15 mph.
Saturday Night
Mostly cloudy, with a low around 34.
Sunday
Cloudy, with a high near 53.
Sunday Night
Rain, mainly after 2am. Low around 45. Chance of precipitation is 80%.
Monday
Rain. High near 65. Chance of precipitation is 90%.
Monday Night
Rain likely before 2am, then a chance of rain and snow. Mostly cloudy, with a low around 31. Chance of precipitation is 60%.
Tuesday
A chance of rain and snow. Mostly sunny, with a high near 40. Chance of precipitation is 30%.
Tuesday Night
Mostly clear, with a low around 22.
Wednesday
Sunny, with a high near 40.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Princeton Junction NJ
 40.3°N 74.62°W (Elev. 98 ft)
Last Update:
6:09 am EDT Mar 12, 2026
Forecast Valid:
11am EDT Mar 12, 2026-6pm EDT Mar 18, 2026
 
Forecast Discussion
 
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Additional Resources

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation