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.

Light Rain

56°F

13°C

Humidity 84%
Wind Speed Calm
Barometer 29.80 in (1008.4 mb)
Dewpoint 51°F (11°C)
Visibility 10.00 mi
Last update 14 May 12:53 am EDT
Extended Forecast for

Princeton NJ

  • Overnight

    Overnight: Showers and possibly a thunderstorm, mainly before 5am, then a chance of showers and thunderstorms after 5am. Low around 54. South wind around 5 mph. Chance of precipitation is 80%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 54 °F

    Showers

  • Thursday

    Thursday: Showers likely, mainly before 2pm. Mostly cloudy, with a high near 66. West wind 5 to 10 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

    High: 66 °F

    Showers
    Likely

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 48. Northwest wind around 5 mph.

    Low: 48 °F

    Mostly Cloudy

  • Friday

    Friday: A slight chance of showers before 2pm. Partly sunny, with a high near 69. Northwest wind around 10 mph. Chance of precipitation is 20%.

    High: 69 °F

    Slight Chance
    Showers

  • Friday Night

    Friday Night: Partly cloudy, with a low around 50. Calm wind.

    Low: 50 °F

    Partly Cloudy

  • Saturday

    Saturday: Sunny, with a high near 80.

    High: 80 °F

    Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 59.

    Low: 59 °F

    Partly Cloudy

  • Sunday

    Sunday: Partly sunny, with a high near 82.

    High: 82 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 61.

    Low: 61 °F

    Partly Cloudy

Detailed Forecast

Overnight
Showers and possibly a thunderstorm, mainly before 5am, then a chance of showers and thunderstorms after 5am. Low around 54. South wind around 5 mph. Chance of precipitation is 80%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Thursday
Showers likely, mainly before 2pm. Mostly cloudy, with a high near 66. West wind 5 to 10 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Thursday Night
Mostly cloudy, with a low around 48. Northwest wind around 5 mph.
Friday
A slight chance of showers before 2pm. Partly sunny, with a high near 69. Northwest wind around 10 mph. Chance of precipitation is 20%.
Friday Night
Partly cloudy, with a low around 50. Calm wind.
Saturday
Sunny, with a high near 80.
Saturday Night
Partly cloudy, with a low around 59.
Sunday
Partly sunny, with a high near 82.
Sunday Night
Partly cloudy, with a low around 61.
Monday
Mostly sunny, with a high near 83.
Monday Night
Mostly clear, with a low around 62.
Tuesday
Sunny, with a high near 90.
Tuesday Night
Partly cloudy, with a low around 67.
Wednesday
A chance of showers. Partly sunny, with a high near 88. Chance of precipitation is 30%.
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:
4:09 pm EDT May 13, 2026
Forecast Valid:
1am EDT May 14, 2026-6pm EDT May 20, 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