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

Hazardous Weather Conditions

Current conditions at

Trenton-Mercer Airport (KTTN)

Lat: 40.28°NLon: 74.82°WElev: 210ft.

Mostly Cloudy

31°C

88°F

Humidity 63%
Wind Speed S 17 km/h
Barometer 1014.6 mb (29.98 in)
Dewpoint 23°C (74°F)
Visibility 16 km
Heat Index36°C (97°F)
Last update 14 Jul 2:53 pm EDT
Extended Forecast for

Princeton North NJ

Flood Watch July 14, 03:13pm until July 15, 02:00am
Click here for hazard details and duration
Flood Watch
  •  
    Flood Watch July 14, 03:13pm until July 15, 02:00am

    NOW until 2:00am Tue

    Flood Watch

  • This Afternoon

    High: 31 °C

    T-storms
    Likely

  • Tonight

    Tonight: Showers and thunderstorms before 3am, then showers likely and possibly a thunderstorm between 3am and 4am, then scattered showers and thunderstorms after 4am. Low around 22. Calm wind. Chance of precipitation is 80%. New rainfall amounts between 2 and 3 cm possible.

    Low: 22 °C

    T-storms then
    Showers
    Likely

  • Tuesday

    Tuesday: A chance of showers and thunderstorms, mainly after 3pm. Partly sunny, with a high near 31. Calm wind. Chance of precipitation is 40%. New rainfall amounts between 2.5 and 5 mm possible.

    High: 31 °C

    Chance
    Showers then
    Chance
    T-storms

  • Tuesday Night

    Tuesday Night: A chance of showers and thunderstorms before 11pm, then a slight chance of showers. Partly cloudy, with a low around 22. Calm wind. Chance of precipitation is 30%. New precipitation amounts between 1 and 2.5 mm, except higher amounts possible in thunderstorms.

    Low: 22 °C

    Chance
    T-storms then
    Slight Chance
    Showers

  • Wednesday

    Wednesday: A chance of showers, then showers likely and possibly a thunderstorm after 2pm. Mostly cloudy, with a high near 32. Calm wind becoming south 5 to 10 km/h in the afternoon. Chance of precipitation is 60%. New rainfall amounts between 2.5 and 5 mm possible.

    High: 32 °C

    Showers
    Likely

  • Wednesday Night

    Wednesday Night: Showers likely and possibly a thunderstorm before 8pm, then a chance of showers and thunderstorms between 8pm and 5am, then a chance of showers after 5am. Mostly cloudy, with a low around 23. Chance of precipitation is 60%. New rainfall amounts between 2.5 and 5 mm possible.

    Low: 23 °C

    Showers
    Likely then
    Chance
    T-storms

  • Thursday

    Thursday: A chance of showers, with thunderstorms also possible after 11am. Partly sunny, with a high near 33. Chance of precipitation is 50%.

    High: 33 °C

    Chance
    T-storms

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 24.

    Low: 24 °C

    Partly Cloudy

Detailed Forecast

This Afternoon
Showers and thunderstorms likely, mainly after 5pm. Mostly cloudy, with a high near 31. South wind around 10 km/h. Chance of precipitation is 60%. New rainfall amounts between 1 and 2 cm possible.
Tonight
Showers and thunderstorms before 3am, then showers likely and possibly a thunderstorm between 3am and 4am, then scattered showers and thunderstorms after 4am. Low around 22. Calm wind. Chance of precipitation is 80%. New rainfall amounts between 2 and 3 cm possible.
Tuesday
A chance of showers and thunderstorms, mainly after 3pm. Partly sunny, with a high near 31. Calm wind. Chance of precipitation is 40%. New rainfall amounts between 2.5 and 5 mm possible.
Tuesday Night
A chance of showers and thunderstorms before 11pm, then a slight chance of showers. Partly cloudy, with a low around 22. Calm wind. Chance of precipitation is 30%. New precipitation amounts between 1 and 2.5 mm, except higher amounts possible in thunderstorms.
Wednesday
A chance of showers, then showers likely and possibly a thunderstorm after 2pm. Mostly cloudy, with a high near 32. Calm wind becoming south 5 to 10 km/h in the afternoon. Chance of precipitation is 60%. New rainfall amounts between 2.5 and 5 mm possible.
Wednesday Night
Showers likely and possibly a thunderstorm before 8pm, then a chance of showers and thunderstorms between 8pm and 5am, then a chance of showers after 5am. Mostly cloudy, with a low around 23. Chance of precipitation is 60%. New rainfall amounts between 2.5 and 5 mm possible.
Thursday
A chance of showers, with thunderstorms also possible after 11am. Partly sunny, with a high near 33. Chance of precipitation is 50%.
Thursday Night
Partly cloudy, with a low around 24.
Friday
A chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 33. Chance of precipitation is 50%.
Friday Night
A chance of showers and thunderstorms before 8pm. Mostly cloudy, with a low around 21. Chance of precipitation is 30%.
Saturday
A chance of showers. Mostly sunny, with a high near 30. Chance of precipitation is 30%.
Saturday Night
A chance of showers. Partly cloudy, with a low around 21. Chance of precipitation is 30%.
Sunday
A chance of showers and thunderstorms. Partly sunny, with a high near 30. Chance of precipitation is 50%.
Sunday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 21. Chance of precipitation is 40%.
Monday
A chance of showers and thunderstorms. Mostly sunny, with a high near 30.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Princeton North NJ
 40.37°N 74.64°W (Elev. 98 m)
Last Update:
3:01 pm EDT Jul 14, 2025
Forecast Valid:
3pm EDT Jul 14, 2025-6pm EDT Jul 21, 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