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.

Fair

61°F

16°C

Humidity 100%
Wind Speed SW 5 mph
Barometer 29.86 in (1010.6 mb)
Dewpoint 61°F (16°C)
Visibility 8.00 mi
Last update 14 Oct 5:53 am EDT
Extended Forecast for

Plainsboro NJ

  • Today

    Today: A chance of showers, mainly before 2pm. Increasing clouds, with a high near 82. West wind 5 to 10 mph. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.

    High: 82 °F

    Chance
    Showers

  • Tonight

    Tonight: Partly cloudy, with a low around 53. West wind around 5 mph becoming north after midnight.

    Low: 53 °F

    Partly Cloudy

  • Thursday

    Thursday: Sunny, with a high near 67. North wind 5 to 10 mph.

    High: 67 °F

    Sunny

  • Thursday Night

    Thursday Night: Showers likely after 2am. Increasing clouds, with a low around 51. Calm wind. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 51 °F

    Partly Cloudy
    then Showers
    Likely

  • Friday

    Friday: Showers, with thunderstorms also possible after 5pm. High near 77. Southwest wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 77 °F

    Showers
    Likely then
    Showers

  • Friday Night

    Friday Night: Showers and possibly a thunderstorm before 8pm, then a chance of showers between 8pm and 2am. Low around 41. Breezy. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 41 °F

    Showers then
    Chance
    Showers and
    Breezy

  • Saturday

    Saturday: Sunny, with a high near 53.

    High: 53 °F

    Sunny

  • Saturday Night

    Saturday Night: Patchy frost. Otherwise, mostly clear, with a low around 34.

    Low: 34 °F

    Patchy Frost

  • Sunday

    Sunday: Patchy frost before 9am. Otherwise, sunny, with a high near 60.

    High: 60 °F

    Patchy Frost
    then Sunny

Detailed Forecast

Today
A chance of showers, mainly before 2pm. Increasing clouds, with a high near 82. West wind 5 to 10 mph. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.
Tonight
Partly cloudy, with a low around 53. West wind around 5 mph becoming north after midnight.
Thursday
Sunny, with a high near 67. North wind 5 to 10 mph.
Thursday Night
Showers likely after 2am. Increasing clouds, with a low around 51. Calm wind. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.
Friday
Showers, with thunderstorms also possible after 5pm. High near 77. Southwest wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Friday Night
Showers and possibly a thunderstorm before 8pm, then a chance of showers between 8pm and 2am. Low around 41. Breezy. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Saturday
Sunny, with a high near 53.
Saturday Night
Patchy frost. Otherwise, mostly clear, with a low around 34.
Sunday
Patchy frost before 9am. Otherwise, sunny, with a high near 60.
Sunday Night
Mostly clear, with a low around 36.
Monday
Sunny, with a high near 65.
Monday Night
Partly cloudy, with a low around 42.
Tuesday
Partly sunny, with a high near 68.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Plainsboro NJ
 40.33°N 74.56°W (Elev. 98 ft)
Last Update:
4:09 am EDT Oct 14, 2026
Forecast Valid:
6am EDT Oct 14, 2026-6pm EDT Oct 20, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation