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

62°F

17°C

Humidity 32%
Wind Speed W 9 G 17 mph
Barometer 30.09 in (1018.3 mb)
Dewpoint 32°F (0°C)
Visibility 10.00 mi
Last update 6 Oct 3:53 pm EDT
Extended Forecast for

Princeton NJ

  • Tonight

    Tonight: Patchy frost after 2am. Otherwise, mostly clear, with a low around 38. West wind 5 to 10 mph becoming light and variable in the evening.

    Low: 38 °F

    Mostly Clear
    then Patchy
    Frost

  • Wednesday

    Wednesday: Patchy frost before 9am. Otherwise, sunny, with a high near 69. Light southwest wind increasing to 5 to 10 mph in the morning. Winds could gust as high as 20 mph.

    High: 69 °F

    Patchy Frost
    then Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 51. South wind 5 to 10 mph.

    Low: 51 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 77. Southwest wind around 5 mph.

    High: 77 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 50. Calm wind.

    Low: 50 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 71.

    High: 71 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 48.

    Low: 48 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 71.

    High: 71 °F

    Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 50.

    Low: 50 °F

    Partly Cloudy

Detailed Forecast

Tonight
Patchy frost after 2am. Otherwise, mostly clear, with a low around 38. West wind 5 to 10 mph becoming light and variable in the evening.
Wednesday
Patchy frost before 9am. Otherwise, sunny, with a high near 69. Light southwest wind increasing to 5 to 10 mph in the morning. Winds could gust as high as 20 mph.
Wednesday Night
Mostly clear, with a low around 51. South wind 5 to 10 mph.
Thursday
Sunny, with a high near 77. Southwest wind around 5 mph.
Thursday Night
Mostly clear, with a low around 50. Calm wind.
Friday
Sunny, with a high near 71.
Friday Night
Mostly clear, with a low around 48.
Saturday
Sunny, with a high near 71.
Saturday Night
Partly cloudy, with a low around 50.
Sunday
Partly sunny, with a high near 71.
Sunday Night
A chance of showers. Mostly cloudy, with a low around 55. Chance of precipitation is 40%.
Columbus Day
A chance of showers. Mostly cloudy, with a high near 71. Chance of precipitation is 40%.
Monday Night
Mostly cloudy, with a low around 55.
Tuesday
Mostly sunny, with a high near 71.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Princeton NJ
 40.34°N 74.64°W (Elev. 98 ft)
Last Update:
7:41 am EDT Oct 6, 2026
Forecast Valid:
3pm EDT Oct 6, 2026-6pm EDT Oct 13, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation