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

46°F

8°C

Humidity 47%
Wind Speed SW 7 mph
Barometer 30.16 in (1020.8 mb)
Dewpoint 27°F (-3°C)
Visibility 10.00 mi
Wind Chill42°F (6°C)
Last update 19 Mar 5:53 pm EDT
Extended Forecast for

Princeton NJSimilar City Names

  • Tonight

    Tonight: Partly cloudy, with a low around 31. Southwest wind around 5 mph becoming calm.

    Low: 31 °F

    Partly Cloudy

  • Friday

    Friday: Increasing clouds, with a high near 61. Light southwest wind becoming south 10 to 15 mph in the afternoon. Winds could gust as high as 25 mph.

    High: 61 °F

    Increasing
    Clouds

  • Friday Night

    Friday Night: Showers likely, mainly between 8pm and 2am. Mostly cloudy, with a low around 44. South wind 5 to 15 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 44 °F

    Showers
    Likely

  • Saturday

    Saturday: Sunny, with a high near 63. Northwest wind around 5 mph.

    High: 63 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 41. Calm wind.

    Low: 41 °F

    Mostly Cloudy

  • Sunday

    Sunday: Partly sunny, with a high near 66.

    High: 66 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: Showers likely, mainly after 2am. Mostly cloudy, with a low around 44. Chance of precipitation is 60%.

    Low: 44 °F

    Showers
    Likely

  • Monday

    Monday: Showers likely before 8am. Mostly sunny, with a high near 58. Chance of precipitation is 60%.

    High: 58 °F

    Showers
    Likely then
    Mostly Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 29.

    Low: 29 °F

    Mostly Clear

Detailed Forecast

Tonight
Partly cloudy, with a low around 31. Southwest wind around 5 mph becoming calm.
Friday
Increasing clouds, with a high near 61. Light southwest wind becoming south 10 to 15 mph in the afternoon. Winds could gust as high as 25 mph.
Friday Night
Showers likely, mainly between 8pm and 2am. Mostly cloudy, with a low around 44. South wind 5 to 15 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.
Saturday
Sunny, with a high near 63. Northwest wind around 5 mph.
Saturday Night
Mostly cloudy, with a low around 41. Calm wind.
Sunday
Partly sunny, with a high near 66.
Sunday Night
Showers likely, mainly after 2am. Mostly cloudy, with a low around 44. Chance of precipitation is 60%.
Monday
Showers likely before 8am. Mostly sunny, with a high near 58. Chance of precipitation is 60%.
Monday Night
Mostly clear, with a low around 29.
Tuesday
Sunny, with a high near 47.
Tuesday Night
Mostly cloudy, with a low around 32.
Wednesday
Mostly cloudy, with a high near 51.
Wednesday Night
Mostly cloudy, with a low around 33.
Thursday
Partly sunny, with a high near 56.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Princeton NJSimilar City Names
 40.35°N 74.67°W (Elev. 190 ft)
Last Update:
4:10 pm EDT Mar 19, 2026
Forecast Valid:
5pm EDT Mar 19, 2026-6pm EDT Mar 26, 2026
 
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Additional Resources

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High Temperature

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Chance of Precipitation