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

74°F

23°C

Humidity 62%
Wind Speed W 7 mph
Barometer 30.06 in (1017.3 mb)
Dewpoint 60°F (16°C)
Visibility 10.00 mi
Last update 17 May 9:53 am EDT
Extended Forecast for

Plainsboro NJ

  • Today

    Today: Sunny, with a high near 88. West wind 5 to 10 mph.

    High: 88 °F

    Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 64. West wind around 5 mph becoming calm in the evening.

    Low: 64 °F

    Partly Cloudy

  • Monday

    Monday: Sunny, with a high near 91. Calm wind becoming south around 5 mph in the afternoon.

    High: 91 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 67. South wind around 5 mph.

    Low: 67 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 95. Southwest wind 5 to 10 mph.

    High: 95 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 71.

    Low: 71 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Showers likely and possibly a thunderstorm after 2pm. Mostly sunny, with a high near 93. Chance of precipitation is 70%.

    High: 93 °F

    Sunny then
    Showers
    Likely

  • Wednesday Night

    Wednesday Night: Showers likely and possibly a thunderstorm before 8pm, then a chance of showers between 8pm and 2am. Mostly cloudy, with a low around 56. Chance of precipitation is 60%.

    Low: 56 °F

    Showers
    Likely

  • Thursday

    Thursday: Partly sunny, with a high near 73.

    High: 73 °F

    Partly Sunny

Detailed Forecast

Today
Sunny, with a high near 88. West wind 5 to 10 mph.
Tonight
Partly cloudy, with a low around 64. West wind around 5 mph becoming calm in the evening.
Monday
Sunny, with a high near 91. Calm wind becoming south around 5 mph in the afternoon.
Monday Night
Mostly clear, with a low around 67. South wind around 5 mph.
Tuesday
Sunny, with a high near 95. Southwest wind 5 to 10 mph.
Tuesday Night
Partly cloudy, with a low around 71.
Wednesday
Showers likely and possibly a thunderstorm after 2pm. Mostly sunny, with a high near 93. Chance of precipitation is 70%.
Wednesday Night
Showers likely and possibly a thunderstorm before 8pm, then a chance of showers between 8pm and 2am. Mostly cloudy, with a low around 56. Chance of precipitation is 60%.
Thursday
Partly sunny, with a high near 73.
Thursday Night
Mostly cloudy, with a low around 51.
Friday
A chance of showers. Partly sunny, with a high near 67. Chance of precipitation is 30%.
Friday Night
A chance of showers. Mostly cloudy, with a low around 50. Chance of precipitation is 30%.
Saturday
A chance of showers. Mostly cloudy, with a high near 68. Chance of precipitation is 30%.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Plainsboro NJ
 40.34°N 74.59°W (Elev. 89 ft)
Last Update:
4:08 am EDT May 17, 2026
Forecast Valid:
10am EDT May 17, 2026-6pm EDT May 23, 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