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

66°F

19°C

Humidity 70%
Wind Speed N 8 mph
Barometer 30.02 in (1015.9 mb)
Dewpoint 56°F (13°C)
Visibility 10.00 mi
Last update 15 Oct 12:53 am EDT
Extended Forecast for

Princeton NJ

  • Overnight

    Overnight: Partly cloudy, with a low around 53. North wind around 5 mph.

    Low: 53 °F

    Partly Cloudy

  • Thursday

    Thursday: Sunny, with a high near 65. North wind around 5 mph becoming east in the afternoon.

    High: 65 °F

    Sunny

  • Thursday Night

    Thursday Night: A chance of showers, then showers and possibly a thunderstorm after 3am. Low around 53. Southeast wind around 5 mph becoming calm. Chance of precipitation is 80%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 53 °F

    Partly Cloudy
    then Showers

  • Friday

    Friday: Showers likely and possibly a thunderstorm before 2pm, then a chance of showers between 2pm and 5pm, then showers likely and possibly a thunderstorm after 5pm. Mostly cloudy, with a high near 77. Southwest wind 5 to 10 mph, with gusts as high as 25 mph. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 77 °F

    Showers
    Likely

  • Friday Night

    Friday Night: Showers and possibly a thunderstorm before 11pm, then showers likely. Low around 45. Northwest wind 10 to 15 mph, with gusts as high as 30 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 45 °F

    Showers

  • Saturday

    Saturday: Mostly sunny, with a high near 54. Breezy.

    High: 54 °F

    Mostly Sunny
    and Breezy

  • Saturday Night

    Saturday Night: Areas of frost. Otherwise, mostly clear, with a low around 35.

    Low: 35 °F

    Areas Frost

  • Sunday

    Sunday: Areas of frost before 10am. Otherwise, sunny, with a high near 57.

    High: 57 °F

    Areas Frost
    then Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 37.

    Low: 37 °F

    Mostly Clear

Detailed Forecast

Overnight
Partly cloudy, with a low around 53. North wind around 5 mph.
Thursday
Sunny, with a high near 65. North wind around 5 mph becoming east in the afternoon.
Thursday Night
A chance of showers, then showers and possibly a thunderstorm after 3am. Low around 53. Southeast wind around 5 mph becoming calm. Chance of precipitation is 80%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Friday
Showers likely and possibly a thunderstorm before 2pm, then a chance of showers between 2pm and 5pm, then showers likely and possibly a thunderstorm after 5pm. Mostly cloudy, with a high near 77. Southwest wind 5 to 10 mph, with gusts as high as 25 mph. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Friday Night
Showers and possibly a thunderstorm before 11pm, then showers likely. Low around 45. Northwest wind 10 to 15 mph, with gusts as high as 30 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Saturday
Mostly sunny, with a high near 54. Breezy.
Saturday Night
Areas of frost. Otherwise, mostly clear, with a low around 35.
Sunday
Areas of frost before 10am. Otherwise, sunny, with a high near 57.
Sunday Night
Mostly clear, with a low around 37.
Monday
Sunny, with a high near 63.
Monday Night
Partly cloudy, with a low around 42.
Tuesday
Mostly sunny, with a high near 66.
Tuesday Night
Partly cloudy, with a low around 45.
Wednesday
Sunny, with a high near 66.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Princeton NJ
 40.34°N 74.64°W (Elev. 98 ft)
Last Update:
4:11 pm EDT Oct 14, 2026
Forecast Valid:
1am EDT Oct 15, 2026-6pm EDT Oct 21, 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