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

Excessive Heat Continues today for Portions of Central and Eastern U.S.; Change in Weather Pattern this Week

Dangerous heat and humidity continues today from portions of the Plains to the East Coast. A cold front will bring lower temperatures, and potential for strong to severe thunderstorms with damaging winds and heavy rain that could produce flash flooding to the Central and Eastern U.S. through early this week. High pressure shifts West this week with building heat and monsoonal moisture. Read More >

Hazardous Weather Conditions

Current conditions at

Trenton, Mercer County Airport (KTTN)

Lat: 40.28°NLon: 74.82°WElev: 210ft.

Fair

35°C

95°F

Humidity 51%
Wind Speed W 15 km/h
Barometer 1008.0 mb (29.79 in)
Dewpoint 23°C (74°F)
Visibility 16 km
Heat Index41°C (106°F)
Last update 21 Jul 5:53 pm EDT
Extended Forecast for

Princeton NJ

Flash Flood Watch July 22, 08:00am until July 23, 08:00am
Excessive Heat Warning until July 21, 10:00pm
Click here for hazard details and duration
Flash Flood Watch
Excessive Heat Warning
  •  
    Excessive Heat Warning until July 21, 10:00pm

    NOW until
    10:00pm Sun

    Excessive Heat Warning

  • This
    Afternoon

    This Afternoon: A chance of showers and thunderstorms. Some of the storms could produce gusty winds. Partly sunny and hot, with a high near 37. Heat index values as high as 42. West wind around 16 km/h. Chance of precipitation is 30%.

    Chance
    T-storms

    High: 37 °C

  • Tonight

    Tonight: A chance of showers and thunderstorms. Some of the storms could produce gusty winds and heavy rain. Mostly cloudy, with a low around 23. West wind 8 to 10 km/h becoming north after midnight. Chance of precipitation is 40%. New rainfall amounts between 1 and 2.5 mm, except higher amounts possible in thunderstorms.

    Heavy Rain

    Low: 23 °C

  • Monday

    Monday: Showers and thunderstorms likely, mainly after 11am. Some storms could be severe, with damaging winds and heavy rain. Mostly cloudy, with a high near 31. Northeast wind 8 to 11 km/h becoming south in the afternoon. Chance of precipitation is 70%. New rainfall amounts between 1 and 2 cm possible.

    Severe
    Thunderstorms

    High: 31 °C

  • Monday
    Night

    Monday Night: Showers and thunderstorms before 2am, then showers and possibly a thunderstorm, mainly after 2am. Some storms could be severe, with damaging winds and heavy rain. Low around 21. North wind 8 to 13 km/h. Chance of precipitation is 80%. New rainfall amounts between 2 and 3 cm possible.

    Severe
    Thunderstorms

    Low: 21 °C

  • Tuesday

    Tuesday: Showers and possibly a thunderstorm before 2pm, then a chance of showers. Some of the storms could produce heavy rainfall. High near 27. North wind 8 to 14 km/h. Chance of precipitation is 80%. New rainfall amounts between 1 and 2 cm possible.

    Heavy Rain

    High: 27 °C

  • Tuesday
    Night

    Tuesday Night: A chance of showers before 8pm. Mostly cloudy, with a low around 17. Chance of precipitation is 30%. New precipitation amounts of less than 1 mm possible.

    Chance
    Showers then
    Mostly Cloudy

    Low: 17 °C

  • Wednesday

    Wednesday: Mostly sunny, with a high near 28.

    Mostly Sunny

    High: 28 °C

  • Wednesday
    Night

    Wednesday Night: Partly cloudy, with a low around 16.

    Partly Cloudy

    Low: 16 °C

Detailed Forecast

This Afternoon
A chance of showers and thunderstorms. Some of the storms could produce gusty winds. Partly sunny and hot, with a high near 37. Heat index values as high as 42. West wind around 16 km/h. Chance of precipitation is 30%.
Tonight
A chance of showers and thunderstorms. Some of the storms could produce gusty winds and heavy rain. Mostly cloudy, with a low around 23. West wind 8 to 10 km/h becoming north after midnight. Chance of precipitation is 40%. New rainfall amounts between 1 and 2.5 mm, except higher amounts possible in thunderstorms.
Monday
Showers and thunderstorms likely, mainly after 11am. Some storms could be severe, with damaging winds and heavy rain. Mostly cloudy, with a high near 31. Northeast wind 8 to 11 km/h becoming south in the afternoon. Chance of precipitation is 70%. New rainfall amounts between 1 and 2 cm possible.
Monday Night
Showers and thunderstorms before 2am, then showers and possibly a thunderstorm, mainly after 2am. Some storms could be severe, with damaging winds and heavy rain. Low around 21. North wind 8 to 13 km/h. Chance of precipitation is 80%. New rainfall amounts between 2 and 3 cm possible.
Tuesday
Showers and possibly a thunderstorm before 2pm, then a chance of showers. Some of the storms could produce heavy rainfall. High near 27. North wind 8 to 14 km/h. Chance of precipitation is 80%. New rainfall amounts between 1 and 2 cm possible.
Tuesday Night
A chance of showers before 8pm. Mostly cloudy, with a low around 17. Chance of precipitation is 30%. New precipitation amounts of less than 1 mm possible.
Wednesday
Mostly sunny, with a high near 28.
Wednesday Night
Partly cloudy, with a low around 16.
Thursday
Sunny, with a high near 29.
Thursday Night
Mostly clear, with a low around 17.
Friday
Sunny, with a high near 30.
Friday Night
Mostly clear, with a low around 18.
Saturday
Sunny, with a high near 31.
Saturday Night
Mostly clear, with a low around 19.
Sunday
Sunny, with a high near 31.
Click Map For Forecast
Disclaimer
Map Legend
Point Forecast:
Princeton NJ
 40.35°N 74.67°W (Elev. 58 m)
Last Update:
3:45 pm EDT Jul 21, 2019
Forecast Valid:
5pm EDT Jul 21, 2019-6pm EDT Jul 28, 2019
 
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