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

Trenton-Mercer Airport (KTTN)

Lat: 40.28°NLon: 74.82°WElev: 210ft.

Light Rain

69°F

21°C

Humidity 96%
Wind Speed SW 6 mph
Barometer 30.03 in (1016.2 mb)
Dewpoint 68°F (20°C)
Visibility 10.00 mi
Last update 20 May 7:53 pm EDT
Extended Forecast for

Jamesburg NJ

  • Tonight

    Tonight: Showers likely and possibly a thunderstorm before 4am, then a chance of showers. Mostly cloudy, with a low around 54. North wind around 5 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 54 °F

    Showers
    Likely

  • Thursday

    Thursday: Showers and thunderstorms likely. Cloudy, with a high near 63. Northeast wind 5 to 10 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 63 °F

    Showers
    Likely

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 50. Southeast wind around 5 mph becoming calm.

    Low: 50 °F

    Partly Cloudy

  • Friday

    Friday: Increasing clouds, with a high near 64. East wind around 10 mph.

    High: 64 °F

    Increasing
    Clouds

  • Friday Night

    Friday Night: Showers likely, mainly after 2am. Cloudy, with a low around 46. East wind around 5 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 46 °F

    Chance
    Showers then
    Showers
    Likely

  • Saturday

    Saturday: Showers. High near 58. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.

    High: 58 °F

    Showers

  • Saturday Night

    Saturday Night: Showers. Low around 49. Chance of precipitation is 90%.

    Low: 49 °F

    Showers

  • Sunday

    Sunday: A chance of showers. Cloudy, with a high near 67. Chance of precipitation is 50%.

    High: 67 °F

    Chance
    Showers

  • Sunday Night

    Sunday Night: A chance of showers. Cloudy, with a low around 54. Chance of precipitation is 40%.

    Low: 54 °F

    Chance
    Showers

Detailed Forecast

Tonight
Showers likely and possibly a thunderstorm before 4am, then a chance of showers. Mostly cloudy, with a low around 54. North wind around 5 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Thursday
Showers and thunderstorms likely. Cloudy, with a high near 63. Northeast wind 5 to 10 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Thursday Night
Partly cloudy, with a low around 50. Southeast wind around 5 mph becoming calm.
Friday
Increasing clouds, with a high near 64. East wind around 10 mph.
Friday Night
Showers likely, mainly after 2am. Cloudy, with a low around 46. East wind around 5 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Saturday
Showers. High near 58. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.
Saturday Night
Showers. Low around 49. Chance of precipitation is 90%.
Sunday
A chance of showers. Cloudy, with a high near 67. Chance of precipitation is 50%.
Sunday Night
A chance of showers. Cloudy, with a low around 54. Chance of precipitation is 40%.
Memorial Day
A chance of showers. Cloudy, with a high near 75. Chance of precipitation is 40%.
Monday Night
A chance of showers. Mostly cloudy, with a low around 58. Chance of precipitation is 30%.
Tuesday
Mostly cloudy, with a high near 79.
Tuesday Night
Mostly cloudy, with a low around 59.
Wednesday
Partly sunny, with a high near 81.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Jamesburg NJ
 40.37°N 74.46°W (Elev. 98 ft)
Last Update:
7:43 pm EDT May 20, 2026
Forecast Valid:
9pm EDT May 20, 2026-6pm EDT May 27, 2026
 
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