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

70°F

21°C

Humidity 41%
Wind Speed Vrbl 5 mph
Barometer 30.38 in (1028.2 mb)
Dewpoint 45°F (7°C)
Visibility 10.00 mi
Last update 10 Oct 4:53 pm EDT
Extended Forecast for

Princeton NJ

  • Tonight

    Tonight: Mostly cloudy, with a low around 54. Calm wind becoming northeast around 5 mph after midnight.

    Low: 54 °F

    Mostly Cloudy

  • Sunday

    Sunday: Rain, mainly after 9am. High near 65. East wind 5 to 10 mph, with gusts as high as 25 mph. Chance of precipitation is 100%. New precipitation amounts between three quarters and one inch possible.

    High: 65 °F

    Rain Likely
    then Rain

  • Sunday Night

    Sunday Night: Rain and thunderstorms before 2am, then a chance of showers and thunderstorms, mainly between 2am and 3am. Low around 59. Northeast wind 5 to 10 mph. Chance of precipitation is 90%. New rainfall amounts between a half and three quarters of an inch possible.

    Low: 59 °F

    Showers

  • Columbus Day

    Columbus Day: Cloudy, then gradually becoming mostly sunny, with a high near 71. North wind around 5 mph.

    High: 71 °F

    Decreasing
    Clouds

  • Monday Night

    Monday Night: Mostly clear, with a low around 55. Calm wind.

    Low: 55 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 73.

    High: 73 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 60.

    Low: 60 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 74.

    High: 74 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 53.

    Low: 53 °F

    Mostly Clear

Detailed Forecast

Tonight
Mostly cloudy, with a low around 54. Calm wind becoming northeast around 5 mph after midnight.
Sunday
Rain, mainly after 9am. High near 65. East wind 5 to 10 mph, with gusts as high as 25 mph. Chance of precipitation is 100%. New precipitation amounts between three quarters and one inch possible.
Sunday Night
Rain and thunderstorms before 2am, then a chance of showers and thunderstorms, mainly between 2am and 3am. Low around 59. Northeast wind 5 to 10 mph. Chance of precipitation is 90%. New rainfall amounts between a half and three quarters of an inch possible.
Columbus Day
Cloudy, then gradually becoming mostly sunny, with a high near 71. North wind around 5 mph.
Monday Night
Mostly clear, with a low around 55. Calm wind.
Tuesday
Mostly sunny, with a high near 73.
Tuesday Night
Partly cloudy, with a low around 60.
Wednesday
Mostly sunny, with a high near 74.
Wednesday Night
Mostly clear, with a low around 53.
Thursday
Mostly sunny, with a high near 67.
Thursday Night
Mostly cloudy, with a low around 52.
Friday
A chance of showers. Mostly cloudy, with a high near 65. Chance of precipitation is 40%.
Friday Night
A chance of showers. Mostly cloudy, with a low around 52. Chance of precipitation is 40%.
Saturday
Partly sunny, with a high near 60.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Princeton NJ
 40.37°N 74.67°W (Elev. 256 ft)
Last Update:
4:10 pm EDT Oct 10, 2026
Forecast Valid:
5pm EDT Oct 10, 2026-6pm EDT Oct 17, 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