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

64°F

18°C

Humidity 56%
Wind Speed E 6 mph
Barometer 30.20 in (1022.0 mb)
Dewpoint 48°F (9°C)
Visibility 10.00 mi
Last update 15 Oct 12:53 pm EDT
Extended Forecast for

Plainsboro NJ

  • This Afternoon

    This Afternoon: Mostly sunny, with a high near 65. East wind around 5 mph.

    High: 65 °F

    Mostly Sunny

  • Tonight

    Tonight: Showers, mainly after midnight. Low around 54. Southeast wind around 5 mph. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 54 °F

    Mostly Cloudy
    then Showers

  • Friday

    Friday: Showers likely, mainly before 7am. Cloudy through mid morning, then gradual clearing, with a high near 78. Southwest wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

    High: 78 °F

    Showers
    Likely then
    Mostly Sunny

  • Friday Night

    Friday Night: Showers and thunderstorms likely. Mostly cloudy, with a low around 45. West wind 10 to 15 mph becoming northwest after midnight. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 45 °F

    Showers
    Likely

  • Saturday

    Saturday: A chance of showers before 8am. Partly sunny, with a high near 53. North wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.

    High: 53 °F

    Chance
    Showers then
    Mostly Sunny

  • Saturday Night

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

    Low: 34 °F

    Areas Frost

  • Sunday

    Sunday: Areas of frost before 10am. Otherwise, sunny, with a high near 56.

    High: 56 °F

    Areas Frost
    then Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 37.

    Low: 37 °F

    Mostly Clear

  • Monday

    Monday: Mostly sunny, with a high near 62.

    High: 62 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
Mostly sunny, with a high near 65. East wind around 5 mph.
Tonight
Showers, mainly after midnight. Low around 54. Southeast wind around 5 mph. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.
Friday
Showers likely, mainly before 7am. Cloudy through mid morning, then gradual clearing, with a high near 78. Southwest wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Friday Night
Showers and thunderstorms likely. Mostly cloudy, with a low around 45. West wind 10 to 15 mph becoming northwest after midnight. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Saturday
A chance of showers before 8am. Partly sunny, with a high near 53. North wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.
Saturday Night
Areas of frost. Otherwise, mostly clear, with a low around 34.
Sunday
Areas of frost before 10am. Otherwise, sunny, with a high near 56.
Sunday Night
Mostly clear, with a low around 37.
Monday
Mostly sunny, with a high near 62.
Monday Night
Partly cloudy, with a low around 41.
Tuesday
Mostly sunny, with a high near 65.
Tuesday Night
Partly cloudy, with a low around 43.
Wednesday
Sunny, with a high near 65.
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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 15, 2026
Forecast Valid:
1pm EDT Oct 15, 2026-6pm EDT Oct 21, 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