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

33°F

1°C

Humidity 48%
Wind Speed NW 7 mph
Barometer 30.07 in (1017.8 mb)
Dewpoint 15°F (-9°C)
Visibility 10.00 mi
Wind Chill27°F (-3°C)
Last update 13 Mar 2:53 am EDT
Extended Forecast for

Princeton NJ

  • Overnight

    Overnight: Mostly clear, with a low around 29. West wind around 5 mph.

    Low: 29 °F

    Mostly Clear

  • Friday

    Friday: Increasing clouds, with a high near 49. Light southwest wind becoming south 10 to 15 mph in the morning. Winds could gust as high as 30 mph.

    High: 49 °F

    Increasing
    Clouds

  • Friday Night

    Friday Night: A slight chance of rain between 10pm and 11pm. Partly cloudy, with a low around 38. South wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 20%.

    Low: 38 °F

    Slight Chance
    Rain then
    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 52. Breezy, with a west wind 15 to 20 mph, with gusts as high as 35 mph.

    High: 52 °F

    Sunny and
    Breezy

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 34. West wind around 5 mph becoming calm in the evening.

    Low: 34 °F

    Mostly Cloudy

  • Sunday

    Sunday: Mostly cloudy, with a high near 52.

    High: 52 °F

    Mostly Cloudy

  • Sunday Night

    Sunday Night: Showers, mainly after 2am. Low around 43. Chance of precipitation is 100%.

    Low: 43 °F

    Chance
    Showers then
    Showers

  • Monday

    Monday: Showers, with thunderstorms also possible after 2pm. High near 67. Chance of precipitation is 90%.

    High: 67 °F

    Showers

  • Monday Night

    Monday Night: Showers and possibly a thunderstorm. Low around 35. Breezy. Chance of precipitation is 80%.

    Low: 35 °F

    Showers and
    Breezy

Detailed Forecast

Overnight
Mostly clear, with a low around 29. West wind around 5 mph.
Friday
Increasing clouds, with a high near 49. Light southwest wind becoming south 10 to 15 mph in the morning. Winds could gust as high as 30 mph.
Friday Night
A slight chance of rain between 10pm and 11pm. Partly cloudy, with a low around 38. South wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 20%.
Saturday
Sunny, with a high near 52. Breezy, with a west wind 15 to 20 mph, with gusts as high as 35 mph.
Saturday Night
Mostly cloudy, with a low around 34. West wind around 5 mph becoming calm in the evening.
Sunday
Mostly cloudy, with a high near 52.
Sunday Night
Showers, mainly after 2am. Low around 43. Chance of precipitation is 100%.
Monday
Showers, with thunderstorms also possible after 2pm. High near 67. Chance of precipitation is 90%.
Monday Night
Showers and possibly a thunderstorm. Low around 35. Breezy. Chance of precipitation is 80%.
Tuesday
A chance of showers before 8am. Partly sunny, with a high near 45. Chance of precipitation is 30%.
Tuesday Night
Partly cloudy, with a low around 24.
Wednesday
Sunny, with a high near 41.
Wednesday Night
Mostly cloudy, with a low around 27.
Thursday
Mostly cloudy, with a high near 48.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Princeton NJ
 40.34°N 74.64°W (Elev. 98 ft)
Last Update:
2:24 am EDT Mar 13, 2026
Forecast Valid:
3am EDT Mar 13, 2026-6pm EDT Mar 19, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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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