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

71°F

22°C

Humidity 35%
Wind Speed W 7 mph
Barometer 29.92 in (1012.6 mb)
Dewpoint 42°F (6°C)
Visibility 10.00 mi
Last update 8 Oct 5:53 pm EDT
Extended Forecast for

Princeton NJ

  • Tonight

    Tonight: Clear, with a low around 48. West wind around 5 mph, with gusts as high as 20 mph.

    Low: 48 °F

    Clear

  • Friday

    Friday: Sunny, with a high near 72. West wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 72 °F

    Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 48. Northwest wind around 5 mph.

    Low: 48 °F

    Partly Cloudy

  • Saturday

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

    High: 71 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 54. Calm wind.

    Low: 54 °F

    Mostly Cloudy

  • Sunday

    Sunday: Showers likely, mainly after 2pm. Mostly cloudy, with a high near 69. Chance of precipitation is 70%. New precipitation amounts between a quarter and half of an inch possible.

    High: 69 °F

    Chance
    Showers then
    Showers
    Likely

  • Sunday Night

    Sunday Night: Showers. Low around 60. Chance of precipitation is 90%.

    Low: 60 °F

    Showers

  • Columbus Day

    Columbus Day: A chance of showers before 2pm. Mostly cloudy, with a high near 72. Chance of precipitation is 30%.

    High: 72 °F

    Chance
    Showers

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 58.

    Low: 58 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Clear, with a low around 48. West wind around 5 mph, with gusts as high as 20 mph.
Friday
Sunny, with a high near 72. West wind 5 to 10 mph, with gusts as high as 20 mph.
Friday Night
Partly cloudy, with a low around 48. Northwest wind around 5 mph.
Saturday
Mostly sunny, with a high near 71. North wind around 5 mph becoming calm in the morning.
Saturday Night
Mostly cloudy, with a low around 54. Calm wind.
Sunday
Showers likely, mainly after 2pm. Mostly cloudy, with a high near 69. Chance of precipitation is 70%. New precipitation amounts between a quarter and half of an inch possible.
Sunday Night
Showers. Low around 60. Chance of precipitation is 90%.
Columbus Day
A chance of showers before 2pm. Mostly cloudy, with a high near 72. Chance of precipitation is 30%.
Monday Night
Mostly cloudy, with a low around 58.
Tuesday
Mostly sunny, with a high near 74.
Tuesday Night
Mostly cloudy, with a low around 54.
Wednesday
Mostly sunny, with a high near 65.
Wednesday Night
Partly cloudy, with a low around 48.
Thursday
Mostly sunny, with a high near 63.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Princeton NJ
 40.35°N 74.67°W (Elev. 190 ft)
Last Update:
4:09 pm EDT Oct 8, 2026
Forecast Valid:
6pm EDT Oct 8, 2026-6pm EDT Oct 15, 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