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.

Overcast

50°F

10°C

Humidity 86%
Wind Speed NE 7 mph
Barometer 29.64 in (1003.0 mb)
Dewpoint 46°F (8°C)
Visibility 10.00 mi
Wind Chill47°F (8°C)
Last update 12 Nov 5:53 am EST
Extended Forecast for

Princeton NJ

  • Today

    Today: A chance of showers, then showers and possibly a thunderstorm after noon. High near 61. East wind 5 to 10 mph becoming south in the afternoon. Winds could gust as high as 20 mph. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.

    High: 61 °F

    Chance
    Showers then
    Showers

  • Tonight

    Tonight: Showers likely, mainly after 2am. Cloudy, with a low around 38. North wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 38 °F

    Showers
    Likely

  • Friday

    Friday: Rain. High near 45. North wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 100%. New precipitation amounts of less than a tenth of an inch possible.

    High: 45 °F

    Rain

  • Friday Night

    Friday Night: A chance of rain before 4am, then a chance of rain and snow. Mostly cloudy, with a low around 32. Northwest wind around 10 mph. Chance of precipitation is 30%. Little or no snow accumulation expected.

    Low: 32 °F

    Chance Rain
    then Chance
    Rain/Snow

  • Saturday

    Saturday: Mostly cloudy, with a high near 47. Northwest wind 5 to 10 mph.

    High: 47 °F

    Mostly Cloudy

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 31.

    Low: 31 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 50.

    High: 50 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 32.

    Low: 32 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 51.

    High: 51 °F

    Mostly Sunny

Detailed Forecast

Today
A chance of showers, then showers and possibly a thunderstorm after noon. High near 61. East wind 5 to 10 mph becoming south in the afternoon. Winds could gust as high as 20 mph. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.
Tonight
Showers likely, mainly after 2am. Cloudy, with a low around 38. North wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.
Friday
Rain. High near 45. North wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 100%. New precipitation amounts of less than a tenth of an inch possible.
Friday Night
A chance of rain before 4am, then a chance of rain and snow. Mostly cloudy, with a low around 32. Northwest wind around 10 mph. Chance of precipitation is 30%. Little or no snow accumulation expected.
Saturday
Mostly cloudy, with a high near 47. Northwest wind 5 to 10 mph.
Saturday Night
Partly cloudy, with a low around 31.
Sunday
Mostly sunny, with a high near 50.
Sunday Night
Partly cloudy, with a low around 32.
Monday
Mostly sunny, with a high near 51.
Monday Night
Mostly clear, with a low around 29.
Tuesday
Sunny, with a high near 53.
Tuesday Night
Mostly clear, with a low around 29.
Wednesday
Sunny, with a high near 58.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Princeton NJ
 40.35°N 74.67°W (Elev. 190 ft)
Last Update:
4:07 am EST Nov 12, 2026
Forecast Valid:
6am EST Nov 12, 2026-6pm EST Nov 18, 2026
 
Forecast Discussion
 
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Additional Resources

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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