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.

Partly Cloudy

73°F

23°C

Humidity 76%
Wind Speed W 6 mph
Barometer 29.90 in (1011.8 mb)
Dewpoint 65°F (18°C)
Visibility 10.00 mi
Last update 14 Oct 11:53 am EDT
Extended Forecast for

Princeton NJ

  • This Afternoon

    This Afternoon: A slight chance of showers between 2pm and 3pm. Partly sunny, with a high near 82. West wind around 10 mph. Chance of precipitation is 20%.

    High: 82 °F

    Slight Chance
    Showers

  • Tonight

    Tonight: Partly cloudy, with a low around 53. North wind 5 to 10 mph.

    Low: 53 °F

    Partly Cloudy

  • Thursday

    Thursday: Sunny, with a high near 67. North wind around 5 mph.

    High: 67 °F

    Sunny

  • Thursday Night

    Thursday Night: Showers after 2am. Low around 53. Southeast wind around 5 mph becoming calm. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 53 °F

    Partly Cloudy
    then Showers

  • Friday

    Friday: Showers, with thunderstorms also possible after 5pm. High near 76. Southwest wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 76 °F

    Showers

  • Friday Night

    Friday Night: Showers and possibly a thunderstorm before 8pm, then a chance of showers between 8pm and 2am. Low around 43. Breezy. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 43 °F

    Showers then
    Chance
    Showers and
    Breezy

  • Saturday

    Saturday: Sunny, with a high near 53.

    High: 53 °F

    Sunny

  • Saturday Night

    Saturday Night: Patchy frost. Otherwise, mostly clear, with a low around 35.

    Low: 35 °F

    Patchy Frost

  • Sunday

    Sunday: Patchy frost before 9am. Otherwise, sunny, with a high near 60.

    High: 60 °F

    Patchy Frost
    then Sunny

Detailed Forecast

This Afternoon
A slight chance of showers between 2pm and 3pm. Partly sunny, with a high near 82. West wind around 10 mph. Chance of precipitation is 20%.
Tonight
Partly cloudy, with a low around 53. North wind 5 to 10 mph.
Thursday
Sunny, with a high near 67. North wind around 5 mph.
Thursday Night
Showers after 2am. Low around 53. Southeast wind around 5 mph becoming calm. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.
Friday
Showers, with thunderstorms also possible after 5pm. High near 76. Southwest wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Friday Night
Showers and possibly a thunderstorm before 8pm, then a chance of showers between 8pm and 2am. Low around 43. Breezy. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Saturday
Sunny, with a high near 53.
Saturday Night
Patchy frost. Otherwise, mostly clear, with a low around 35.
Sunday
Patchy frost before 9am. Otherwise, sunny, with a high near 60.
Sunday Night
Mostly clear, with a low around 38.
Monday
Sunny, with a high near 65.
Monday Night
Partly cloudy, with a low around 44.
Tuesday
Partly sunny, with a high near 68.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Princeton NJ
 40.35°N 74.67°W (Elev. 190 ft)
Last Update:
4:09 am EDT Oct 14, 2026
Forecast Valid:
12pm EDT Oct 14, 2026-6pm EDT Oct 20, 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