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.

Fog/Mist

63°F

17°C

Humidity 100%
Wind Speed SW 6 mph
Barometer 29.84 in (1009.9 mb)
Dewpoint 63°F (17°C)
Visibility 3.00 mi
Last update 16 Oct 10:53 am EDT
Extended Forecast for

3 Miles SSE Princeton Junction NJ

  • Today

    Today: A chance of showers before 1pm, then a chance of showers and thunderstorms after 5pm. Mostly cloudy, with a high near 80. Southwest wind 10 to 15 mph. Chance of precipitation is 40%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 80 °F

    Chance
    T-storms

  • Tonight

    Tonight: Showers and thunderstorms before 4am, then a slight chance of showers between 4am and 5am. Some of the storms could be severe. Low around 44. North wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 44 °F

    Severe
    Thunderstorms
    then Chance
    Showers

  • Saturday

    Saturday: Cloudy, then gradually becoming mostly sunny, with a high near 54. Breezy, with a north wind around 20 mph, with gusts as high as 35 mph.

    High: 54 °F

    Decreasing
    Clouds and
    Breezy

  • Saturday Night

    Saturday Night: Patchy frost after 3am. Otherwise, mostly clear, with a low around 34. North wind 5 to 10 mph.

    Low: 34 °F

    Mostly Clear
    then Patchy
    Frost

  • Sunday

    Sunday: Patchy frost before 9am. Otherwise, sunny, with a high near 57. North wind around 5 mph.

    High: 57 °F

    Patchy Frost
    then Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 38.

    Low: 38 °F

    Mostly Clear

  • Monday

    Monday: Mostly sunny, with a high near 60.

    High: 60 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 41.

    Low: 41 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 66.

    High: 66 °F

    Mostly Sunny

Detailed Forecast

Today
A chance of showers before 1pm, then a chance of showers and thunderstorms after 5pm. Mostly cloudy, with a high near 80. Southwest wind 10 to 15 mph. Chance of precipitation is 40%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Tonight
Showers and thunderstorms before 4am, then a slight chance of showers between 4am and 5am. Some of the storms could be severe. Low around 44. North wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Saturday
Cloudy, then gradually becoming mostly sunny, with a high near 54. Breezy, with a north wind around 20 mph, with gusts as high as 35 mph.
Saturday Night
Patchy frost after 3am. Otherwise, mostly clear, with a low around 34. North wind 5 to 10 mph.
Sunday
Patchy frost before 9am. Otherwise, sunny, with a high near 57. North wind around 5 mph.
Sunday Night
Mostly clear, with a low around 38.
Monday
Mostly sunny, with a high near 60.
Monday Night
Mostly cloudy, with a low around 41.
Tuesday
Mostly sunny, with a high near 66.
Tuesday Night
Partly cloudy, with a low around 45.
Wednesday
Sunny, with a high near 65.
Wednesday Night
Mostly clear, with a low around 44.
Thursday
Mostly sunny, with a high near 62.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles SSE Princeton Junction NJ
 40.27°N 74.6°W (Elev. 98 ft)
Last Update:
11:12 am EDT Oct 16, 2026
Forecast Valid:
11am EDT Oct 16, 2026-6pm EDT Oct 22, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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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