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.

Overcast

29°C

84°F

Humidity 65%
Wind Speed Vrbl 9 km/h
Barometer 1016.7 mb (30.05 in)
Dewpoint 22°C (71°F)
Visibility 16 km
Heat Index32°C (89°F)
Last update 13 Jul 2:53 pm EDT
Extended Forecast for

Princeton NJ

Flood Watch July 14, 02:00pm until July 14, 11:00pm
Click here for hazard details and duration
Flood Watch

  • This Afternoon

    This Afternoon: Partly sunny, with a high near 30. Southeast wind around 15 km/h.

    High: 30 °C

    Partly Sunny

  • Tonight

    Tonight: A slight chance of showers and thunderstorms before 11pm, then a slight chance of showers between 11pm and midnight. Patchy fog after midnight. Otherwise, mostly cloudy, with a low around 21. Southeast wind 10 to 15 km/h decreasing to 5 to 10 km/h after midnight. Chance of precipitation is 20%.

    Low: 21 °C

    Slight Chance
    T-storms then
    Patchy Fog

  • Monday

    Monday: A chance of showers before 2pm, then showers likely and possibly a thunderstorm between 2pm and 5pm, then showers and thunderstorms likely after 5pm. Some of the storms could produce heavy rainfall. Patchy fog before 9am. Otherwise, mostly cloudy, with a high near 31. South wind 5 to 10 km/h. Chance of precipitation is 70%. New rainfall amounts between 7.5 mm and 1 cm possible.

    High: 31 °C

    Heavy Rain
    and Patchy
    Fog then
    Heavy Rain

  • Monday Night

    Monday Night: Showers and thunderstorms likely, mainly before 8pm. Some of the storms could produce heavy rainfall. Mostly cloudy, with a low around 22. Calm wind. Chance of precipitation is 60%. New rainfall amounts between 2.5 and 5 mm possible.

    Low: 22 °C

    Heavy Rain

  • Tuesday

    Tuesday: A chance of showers and thunderstorms. Mostly cloudy, with a high near 31. Calm wind. Chance of precipitation is 50%. 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. Chance of precipitation is 30%. New precipitation amounts of less than 1 mm, except higher amounts possible in thunderstorms.

    Low: 22 °C

    Chance
    T-storms then
    Slight Chance
    Showers

  • Wednesday

    Wednesday: A chance of showers, with thunderstorms also possible after 2pm. Partly sunny, with a high near 32. Chance of precipitation is 50%.

    High: 32 °C

    Chance
    Showers then
    Chance
    T-storms

  • Wednesday Night

    Wednesday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 23. Chance of precipitation is 30%.

    Low: 23 °C

    Chance
    T-storms

  • Thursday

    Thursday: A chance of showers, then showers likely and possibly a thunderstorm after 2pm. Mostly cloudy, with a high near 33. Chance of precipitation is 60%.

    High: 33 °C

    Chance
    Showers then
    Showers
    Likely

Detailed Forecast

This Afternoon
Partly sunny, with a high near 30. Southeast wind around 15 km/h.
Tonight
A slight chance of showers and thunderstorms before 11pm, then a slight chance of showers between 11pm and midnight. Patchy fog after midnight. Otherwise, mostly cloudy, with a low around 21. Southeast wind 10 to 15 km/h decreasing to 5 to 10 km/h after midnight. Chance of precipitation is 20%.
Monday
A chance of showers before 2pm, then showers likely and possibly a thunderstorm between 2pm and 5pm, then showers and thunderstorms likely after 5pm. Some of the storms could produce heavy rainfall. Patchy fog before 9am. Otherwise, mostly cloudy, with a high near 31. South wind 5 to 10 km/h. Chance of precipitation is 70%. New rainfall amounts between 7.5 mm and 1 cm possible.
Monday Night
Showers and thunderstorms likely, mainly before 8pm. Some of the storms could produce heavy rainfall. Mostly cloudy, with a low around 22. Calm wind. Chance of precipitation is 60%. New rainfall amounts between 2.5 and 5 mm possible.
Tuesday
A chance of showers and thunderstorms. Mostly cloudy, with a high near 31. Calm wind. Chance of precipitation is 50%. 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. Chance of precipitation is 30%. New precipitation amounts of less than 1 mm, except higher amounts possible in thunderstorms.
Wednesday
A chance of showers, with thunderstorms also possible after 2pm. Partly sunny, with a high near 32. Chance of precipitation is 50%.
Wednesday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 23. Chance of precipitation is 30%.
Thursday
A chance of showers, then showers likely and possibly a thunderstorm after 2pm. Mostly cloudy, with a high near 33. Chance of precipitation is 60%.
Thursday Night
Showers likely and possibly a thunderstorm before 8pm, then a chance of showers and thunderstorms between 8pm and 2am. Mostly cloudy, with a low around 23. Chance of precipitation is 60%.
Friday
A chance of showers and thunderstorms. Partly sunny, with a high near 32. Chance of precipitation is 40%.
Friday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 22. Chance of precipitation is 30%.
Saturday
A chance of showers and thunderstorms. Partly sunny, with a high near 31. Chance of precipitation is 30%.
Saturday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 21. Chance of precipitation is 30%.
Sunday
A chance of showers. Partly sunny, with a high near 29.
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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 am EDT Jul 13, 2025
Forecast Valid:
3pm EDT Jul 13, 2025-6pm EDT Jul 20, 2025
 
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