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

63°F

17°C

Humidity 37%
Wind Speed SW 7 mph
Barometer 29.85 in (1010.4 mb)
Dewpoint 36°F (2°C)
Visibility 10.00 mi
Last update 11 Nov 2:53 pm EST
Extended Forecast for

Princeton NJ

  • Tonight

    Tonight: Mostly cloudy, with a low around 45. Calm wind becoming east around 5 mph after midnight.

    Low: 45 °F

    Mostly Cloudy

  • Thursday

    Thursday: Rain likely before 10am, then rain and possibly a thunderstorm between 10am and 1pm, then rain after 1pm. High near 62. East wind around 5 mph becoming west in the afternoon. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.

    High: 62 °F

    Rain

  • Thursday Night

    Thursday Night: Rain likely, mainly after 1am. Mostly cloudy, with a low around 39. Northwest wind 5 to 10 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 39 °F

    Rain Likely

  • Friday

    Friday: Rain likely, mainly before 1pm. Mostly cloudy, with a high near 48. Northwest wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

    High: 48 °F

    Rain Likely

  • Friday Night

    Friday Night: A slight chance of rain. Mostly cloudy, with a low around 32. Northwest wind around 5 mph. Chance of precipitation is 20%.

    Low: 32 °F

    Slight Chance
    Rain

  • Saturday

    Saturday: Partly sunny, with a high near 48.

    High: 48 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 33.

    Low: 33 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 50.

    High: 50 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 32.

    Low: 32 °F

    Mostly Clear

Detailed Forecast

Tonight
Mostly cloudy, with a low around 45. Calm wind becoming east around 5 mph after midnight.
Thursday
Rain likely before 10am, then rain and possibly a thunderstorm between 10am and 1pm, then rain after 1pm. High near 62. East wind around 5 mph becoming west in the afternoon. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
Thursday Night
Rain likely, mainly after 1am. Mostly cloudy, with a low around 39. Northwest wind 5 to 10 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Friday
Rain likely, mainly before 1pm. Mostly cloudy, with a high near 48. Northwest wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Friday Night
A slight chance of rain. Mostly cloudy, with a low around 32. Northwest wind around 5 mph. Chance of precipitation is 20%.
Saturday
Partly sunny, with a high near 48.
Saturday Night
Partly cloudy, with a low around 33.
Sunday
Mostly sunny, with a high near 50.
Sunday Night
Mostly clear, with a low around 32.
Monday
Sunny, with a high near 52.
Monday Night
Mostly clear, with a low around 29.
Tuesday
Mostly sunny, with a high near 52.
Tuesday Night
Partly cloudy, with a low around 29.
Wednesday
Mostly sunny, with a high near 56.
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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:
9:33 am EST Nov 11, 2026
Forecast Valid:
3pm EST Nov 11, 2026-6pm EST Nov 18, 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