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

2°C

35°F

Humidity 54%
Wind Speed W 7 km/h
Barometer 1020.8 mb (30.16 in)
Dewpoint -7°C (20°F)
Visibility 16 km
Wind Chill-1°C (31°F)
Last update 18 Nov 6:53 am EST
Extended Forecast for

Princeton NJ

  • Today

    Today: Increasing clouds, with a high near 8. West wind 10 to 20 km/h.

    High: 8 °C

    Increasing
    Clouds

  • Tonight

    Tonight: Rain likely, mainly between 11pm and 5am. Cloudy, with a low around 2. Calm wind. Chance of precipitation is 70%. New precipitation amounts between 2.5 and 5 mm possible.

    Low: 2 °C

    Chance Rain
    then Rain
    Likely

  • Wednesday

    Wednesday: A chance of rain, mainly before 7am. Cloudy, then gradually becoming mostly sunny, with a high near 9. Calm wind. Chance of precipitation is 30%. New precipitation amounts of less than 1 mm possible.

    High: 9 °C

    Chance Rain
    then Partly
    Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 1. Calm wind.

    Low: 1 °C

    Mostly Cloudy

  • Thursday

    Thursday: Mostly cloudy, with a high near 9. Calm wind.

    High: 9 °C

    Mostly Cloudy

  • Thursday Night

    Thursday Night: A chance of rain. Cloudy, with a low around 4. Chance of precipitation is 30%.

    Low: 4 °C

    Chance Rain

  • Friday

    Friday: A chance of rain. Mostly cloudy, with a high near 14. Chance of precipitation is 30%.

    High: 14 °C

    Chance Rain

  • Friday Night

    Friday Night: A chance of rain. Mostly cloudy, with a low around 4. Chance of precipitation is 50%.

    Low: 4 °C

    Chance Rain

  • Saturday

    Saturday: A chance of rain before 1pm. Partly sunny, with a high near 11. Chance of precipitation is 30%.

    High: 11 °C

    Chance Rain

Detailed Forecast

Today
Increasing clouds, with a high near 8. West wind 10 to 20 km/h.
Tonight
Rain likely, mainly between 11pm and 5am. Cloudy, with a low around 2. Calm wind. Chance of precipitation is 70%. New precipitation amounts between 2.5 and 5 mm possible.
Wednesday
A chance of rain, mainly before 7am. Cloudy, then gradually becoming mostly sunny, with a high near 9. Calm wind. Chance of precipitation is 30%. New precipitation amounts of less than 1 mm possible.
Wednesday Night
Mostly cloudy, with a low around 1. Calm wind.
Thursday
Mostly cloudy, with a high near 9. Calm wind.
Thursday Night
A chance of rain. Cloudy, with a low around 4. Chance of precipitation is 30%.
Friday
A chance of rain. Mostly cloudy, with a high near 14. Chance of precipitation is 30%.
Friday Night
A chance of rain. Mostly cloudy, with a low around 4. Chance of precipitation is 50%.
Saturday
A chance of rain before 1pm. Partly sunny, with a high near 11. Chance of precipitation is 30%.
Saturday Night
A chance of rain before 1am. Partly cloudy, with a low around -1. Chance of precipitation is 30%.
Sunday
Mostly sunny, with a high near 11.
Sunday Night
Partly cloudy, with a low around 1.
Monday
Mostly sunny, with a high near 12.
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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 m)
Last Update:
6:12 am EST Nov 18, 2025
Forecast Valid:
7am EST Nov 18, 2025-6pm EST Nov 24, 2025
 
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