Dangerous Heat and Humidity Today through Saturday
Dangerously hot and humid conditions are expected to build starting today through Saturday. Additionally, there will be a threat of thunderstorms on some of the days. View this briefing for details. Read More >
Hazardous Weather Conditions
Current conditions at
Trenton-Mercer Airport (KTTN)
Lat: 40.28°NLon: 74.82°WElev: 210ft.
Fair
77°F
25°C
| Humidity | 74% |
| Wind Speed | SW 9 mph |
| Barometer | 30.01 in (1015.3 mb) |
| Dewpoint | 68°F (20°C) |
| Visibility | 10.00 mi |
| Heat Index | 79°F (26°C) |
| Last update | 1 Jul 7:53 am EDT |
Extended Forecast for
Princeton NJ
Extreme Heat Warning July 1, 12:00pm until July 4, 08:00pm
Today
High: 96 °F
Sunny then
Isolated
T-stormsTonight
Low: 75 °F
Isolated
T-stormsThursday
High: 102 °F
Hot
Thursday Night
Low: 79 °F
Clear
Friday
High: 102 °F
Sunny then
Slight Chance
T-stormsFriday Night
Low: 76 °F
Slight Chance
T-stormsIndependence Day
High: 99 °F
Sunny then
Chance
T-stormsSaturday Night
Low: 73 °F
Chance
T-stormsSunday
High: 95 °F
Mostly Sunny
then Showers
Likely
Detailed Forecast
Today
Isolated showers and thunderstorms after 2pm. Sunny, with a high near 96. Heat index values as high as 105. Southwest wind around 10 mph. Chance of precipitation is 20%.
Tonight
Isolated showers and thunderstorms before 3am. Partly cloudy, with a low around 75. South wind around 5 mph. Chance of precipitation is 20%.
Thursday
Sunny and hot, with a high near 102. Heat index values as high as 109. West wind 5 to 10 mph.
Thursday Night
Clear, with a low around 79. West wind around 5 mph.
Friday
A slight chance of showers and thunderstorms after 2pm. Sunny and hot, with a high near 102. West wind 5 to 10 mph. Chance of precipitation is 20%.
Friday Night
A slight chance of showers and thunderstorms before 2am. Partly cloudy, with a low around 76. Chance of precipitation is 20%.
Independence Day
A chance of showers and thunderstorms after 2pm. Mostly sunny and hot, with a high near 99. Chance of precipitation is 30%.
Saturday Night
A chance of showers and thunderstorms before 2am. Mostly cloudy, with a low around 73. Chance of precipitation is 40%.
Sunday
Showers likely and possibly a thunderstorm after 2pm. Partly sunny, with a high near 95. Chance of precipitation is 60%.
Sunday Night
Showers likely and possibly a thunderstorm before 2am, then a chance of showers. Mostly cloudy, with a low around 70. Chance of precipitation is 70%.
Monday
Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 88. Chance of precipitation is 60%.
Monday Night
Showers and thunderstorms likely. Mostly cloudy, with a low around 68. Chance of precipitation is 60%.
Tuesday
Mostly sunny, with a high near 86.
Additional Forecasts and Information
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Forecast AreaABOUT THIS FORECAST
Point Forecast:
Princeton NJ
40.37°N 74.67°W (Elev. 256 ft)
40.37°N 74.67°W (Elev. 256 ft)
5:55 am EDT Jul 1, 2026
8am EDT Jul 1, 2026-6pm EDT Jul 7, 2026
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