National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

Trenton, Mercer County Airport (KTTN)

Lat: 40.28°NLon: 74.82°WElev: 210ft.

Fair

36°C

96°F

Humidity 36%
Wind Speed W 13 km/h
Barometer 1016.0 mb (30.03 in)
Dewpoint 18°C (65°F)
Visibility 16 km
Heat Index37°C (99°F)
Last update 24 Jun 6:53 pm EDT
Extended Forecast for

Princeton NJ

Extreme Heat Warning June 24, 07:03pm until June 25, 08:00pm
Click here for hazard details and duration
Extreme Heat Warning
  •  
    Extreme Heat Warning June 24, 07:03pm until June 25, 08:00pm

    NOW until 8:00pm Wed

    Extreme Heat Warning

  • Tonight

    Low: 25 °C

    Mostly Clear

  • Wednesday

    Wednesday: A chance of showers and thunderstorms, mainly after 3pm. Sunny and hot, with a high near 36. Heat index values as high as 40. Northwest wind 5 to 10 km/h. Chance of precipitation is 30%. New rainfall amounts of less than 1 mm, except higher amounts possible in thunderstorms.

    High: 36 °C

    Sunny then
    Chance
    T-storms

  • Wednesday Night

    Wednesday Night: A chance of showers and thunderstorms. Partly cloudy, with a low around 23. Calm wind. Chance of precipitation is 40%. New rainfall amounts between 1 and 2.5 mm, except higher amounts possible in thunderstorms.

    Low: 23 °C

    Chance
    T-storms then
    Chance
    Showers

  • Thursday

    Thursday: A chance of showers, with thunderstorms also possible after 11am. Mostly cloudy, with a high near 27. East wind around 10 km/h. Chance of precipitation is 50%. New rainfall amounts between 2.5 and 5 mm possible.

    High: 27 °C

    Chance
    Showers then
    Chance
    T-storms

  • Thursday Night

    Thursday Night: A chance of showers and thunderstorms. Cloudy, with a low around 17. East wind around 10 km/h. Chance of precipitation is 50%. New rainfall amounts between 1 and 2.5 mm, except higher amounts possible in thunderstorms.

    Low: 17 °C

    Chance
    T-storms

  • Friday

    Friday: A chance of showers, with thunderstorms also possible after 8am. Mostly cloudy, with a high near 22. Chance of precipitation is 30%. New rainfall amounts of less than 1 mm, except higher amounts possible in thunderstorms.

    High: 22 °C

    Chance
    Showers

  • Friday Night

    Friday Night: A chance of thunderstorms before 8pm, then a chance of showers and thunderstorms after 8pm. Mostly cloudy, with a low around 18. Chance of precipitation is 30%.

    Low: 18 °C

    Chance
    T-storms

  • Saturday

    Saturday: A chance of showers and thunderstorms after 2pm. Mostly cloudy, with a high near 27. Chance of precipitation is 50%.

    High: 27 °C

    Mostly Cloudy
    then Chance
    T-storms

Detailed Forecast

Tonight
Mostly clear, with a low around 25. Calm wind.
Wednesday
A chance of showers and thunderstorms, mainly after 3pm. Sunny and hot, with a high near 36. Heat index values as high as 40. Northwest wind 5 to 10 km/h. Chance of precipitation is 30%. New rainfall amounts of less than 1 mm, except higher amounts possible in thunderstorms.
Wednesday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 23. Calm wind. Chance of precipitation is 40%. New rainfall amounts between 1 and 2.5 mm, except higher amounts possible in thunderstorms.
Thursday
A chance of showers, with thunderstorms also possible after 11am. Mostly cloudy, with a high near 27. East wind around 10 km/h. Chance of precipitation is 50%. New rainfall amounts between 2.5 and 5 mm possible.
Thursday Night
A chance of showers and thunderstorms. Cloudy, with a low around 17. East wind around 10 km/h. Chance of precipitation is 50%. New rainfall amounts between 1 and 2.5 mm, except higher amounts possible in thunderstorms.
Friday
A chance of showers, with thunderstorms also possible after 8am. Mostly cloudy, with a high near 22. Chance of precipitation is 30%. New rainfall amounts of less than 1 mm, except higher amounts possible in thunderstorms.
Friday Night
A chance of thunderstorms before 8pm, then a chance of showers and thunderstorms after 8pm. Mostly cloudy, with a low around 18. Chance of precipitation is 30%.
Saturday
A chance of showers and thunderstorms after 2pm. Mostly cloudy, with a high near 27. Chance of precipitation is 50%.
Saturday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 21. Chance of precipitation is 40%.
Sunday
A chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 29. Chance of precipitation is 40%.
Sunday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 21. Chance of precipitation is 30%.
Monday
A chance of showers and thunderstorms. Partly sunny, with a high near 31. Chance of precipitation is 40%.
Monday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 22. Chance of precipitation is 40%.
Tuesday
Showers likely and possibly a thunderstorm. Partly sunny, with a high near 32. Chance of precipitation is 60%.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Princeton NJ
 40.37°N 74.67°W (Elev. 256 m)
Last Update:
4:11 pm EDT Jun 24, 2025
Forecast Valid:
7pm EDT Jun 24, 2025-6pm EDT Jul 1, 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