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

57°F

14°C

Humidity 96%
Wind Speed Calm
Barometer 30.27 in (1024.3 mb)
Dewpoint 56°F (13°C)
Visibility 10.00 mi
Last update 21 May 9:53 pm EDT
Extended Forecast for

Princeton NJ

  • Tonight

    Tonight: Cloudy, with a low around 50. Calm wind.

    Low: 50 °F

    Cloudy

  • Friday

    Friday: Mostly cloudy, with a high near 63. East wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 63 °F

    Mostly Cloudy

  • Friday Night

    Friday Night: Rain likely, mainly after 2am. Cloudy, with a low around 46. East wind around 5 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 46 °F

    Mostly Cloudy
    then Rain
    Likely

  • Saturday

    Saturday: Rain. High near 56. East wind 10 to 15 mph. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.

    High: 56 °F

    Rain

  • Saturday Night

    Saturday Night: Rain. Low around 47. East wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 100%. New precipitation amounts between three quarters and one inch possible.

    Low: 47 °F

    Rain

  • Sunday

    Sunday: Rain likely before 11am, then showers likely, mainly between 11am and 2pm. Cloudy, with a high near 64. Chance of precipitation is 70%. New precipitation amounts between a quarter and half of an inch possible.

    High: 64 °F

    Rain Likely

  • Sunday Night

    Sunday Night: A chance of showers after 2am. Cloudy, with a low around 53. Chance of precipitation is 30%.

    Low: 53 °F

    Mostly Cloudy
    then Chance
    Showers

  • Memorial Day

    Memorial Day: A chance of showers. Mostly cloudy, with a high near 70. Chance of precipitation is 40%.

    High: 70 °F

    Chance
    Showers

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 57.

    Low: 57 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Cloudy, with a low around 50. Calm wind.
Friday
Mostly cloudy, with a high near 63. East wind 5 to 10 mph, with gusts as high as 20 mph.
Friday Night
Rain likely, mainly after 2am. Cloudy, with a low around 46. East wind around 5 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Saturday
Rain. High near 56. East wind 10 to 15 mph. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.
Saturday Night
Rain. Low around 47. East wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 100%. New precipitation amounts between three quarters and one inch possible.
Sunday
Rain likely before 11am, then showers likely, mainly between 11am and 2pm. Cloudy, with a high near 64. Chance of precipitation is 70%. New precipitation amounts between a quarter and half of an inch possible.
Sunday Night
A chance of showers after 2am. Cloudy, with a low around 53. Chance of precipitation is 30%.
Memorial Day
A chance of showers. Mostly cloudy, with a high near 70. Chance of precipitation is 40%.
Monday Night
Mostly cloudy, with a low around 57.
Tuesday
Mostly cloudy, with a high near 79.
Tuesday Night
Mostly cloudy, with a low around 59.
Wednesday
Partly sunny, with a high near 82.
Wednesday Night
Mostly cloudy, with a low around 59.
Thursday
Mostly sunny, with a high near 80.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Princeton NJ
 40.37°N 74.67°W (Elev. 256 ft)
Last Update:
4:08 pm EDT May 21, 2026
Forecast Valid:
10pm EDT May 21, 2026-6pm EDT May 28, 2026
 
Forecast Discussion
 
Get as KML Get as XML

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