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

72°F

22°C

Humidity 33%
Wind Speed W 8 mph
Barometer 30.13 in (1019.8 mb)
Dewpoint 41°F (5°C)
Visibility 10.00 mi
Last update 9 Oct 3:53 pm EDT
Extended Forecast for

Princeton NJ

  • Tonight

    Tonight: Mostly cloudy, with a low around 46. West wind around 5 mph becoming calm in the evening.

    Low: 46 °F

    Mostly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 71. North wind around 5 mph becoming east in the afternoon.

    High: 71 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 52. East wind around 5 mph becoming calm in the evening.

    Low: 52 °F

    Mostly Cloudy

  • Sunday

    Sunday: Rain. High near 63. East wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 100%. New precipitation amounts between a half and three quarters of an inch possible.

    High: 63 °F

    Rain Likely
    then Rain

  • Sunday Night

    Sunday Night: Rain and possibly a thunderstorm before 2am, then a chance of showers between 2am and 5am, then a chance of showers and thunderstorms after 5am. Low around 60. Northeast wind 5 to 15 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.

    Low: 60 °F

    Showers

  • Columbus Day

    Columbus Day: A chance of showers and thunderstorms before 8am, then a slight chance of showers between 8am and 2pm. Mostly cloudy, with a high near 72. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 72 °F

    Chance
    Showers

  • Monday Night

    Monday Night: Partly cloudy, with a low around 57.

    Low: 57 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 74.

    High: 74 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: A chance of showers between 8pm and 2am. Mostly cloudy, with a low around 54. Chance of precipitation is 30%.

    Low: 54 °F

    Chance
    Showers

Detailed Forecast

Tonight
Mostly cloudy, with a low around 46. West wind around 5 mph becoming calm in the evening.
Saturday
Mostly sunny, with a high near 71. North wind around 5 mph becoming east in the afternoon.
Saturday Night
Mostly cloudy, with a low around 52. East wind around 5 mph becoming calm in the evening.
Sunday
Rain. High near 63. East wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 100%. New precipitation amounts between a half and three quarters of an inch possible.
Sunday Night
Rain and possibly a thunderstorm before 2am, then a chance of showers between 2am and 5am, then a chance of showers and thunderstorms after 5am. Low around 60. Northeast wind 5 to 15 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
Columbus Day
A chance of showers and thunderstorms before 8am, then a slight chance of showers between 8am and 2pm. Mostly cloudy, with a high near 72. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Monday Night
Partly cloudy, with a low around 57.
Tuesday
Mostly sunny, with a high near 74.
Tuesday Night
A chance of showers between 8pm and 2am. Mostly cloudy, with a low around 54. Chance of precipitation is 30%.
Wednesday
Mostly sunny, with a high near 66.
Wednesday Night
Mostly clear, with a low around 47.
Thursday
Mostly sunny, with a high near 63.
Thursday Night
A chance of showers. Mostly cloudy, with a low around 49. Chance of precipitation is 30%.
Friday
A chance of showers. Partly sunny, with a high near 64. Chance of precipitation is 40%.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Princeton NJ
 40.37°N 74.67°W (Elev. 256 ft)
Last Update:
4:09 pm EDT Oct 9, 2026
Forecast Valid:
4pm EDT Oct 9, 2026-6pm EDT Oct 16, 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