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

71°F

22°C

Humidity 71%
Wind Speed S 12 mph
Barometer 29.96 in (1014.0 mb)
Dewpoint 61°F (16°C)
Visibility 10.00 mi
Last update 13 Oct 11:53 am EDT
Extended Forecast for

Princeton NJSimilar City Names

  • This Afternoon

    This Afternoon: Mostly sunny, with a high near 78. Southwest wind around 5 mph.

    High: 78 °F

    Mostly Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 64. Southwest wind around 5 mph.

    Low: 64 °F

    Mostly Clear

  • Wednesday

    Wednesday: Increasing clouds, with a high near 82. West wind around 5 mph.

    High: 82 °F

    Increasing
    Clouds

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 56. Calm wind becoming north around 5 mph after midnight.

    Low: 56 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 68. North wind around 5 mph becoming calm in the afternoon.

    High: 68 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Showers likely and possibly a thunderstorm after 2am. Mostly cloudy, with a low around 52. Chance of precipitation is 70%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 52 °F

    Partly Cloudy
    then Showers
    Likely

  • Friday

    Friday: Showers likely. Mostly cloudy, with a high near 73. Chance of precipitation is 70%.

    High: 73 °F

    Showers
    Likely

  • Friday Night

    Friday Night: Partly cloudy, with a low around 43.

    Low: 43 °F

    Partly Cloudy

  • Saturday

    Saturday: Sunny, with a high near 53.

    High: 53 °F

    Sunny

Detailed Forecast

This Afternoon
Mostly sunny, with a high near 78. Southwest wind around 5 mph.
Tonight
Mostly clear, with a low around 64. Southwest wind around 5 mph.
Wednesday
Increasing clouds, with a high near 82. West wind around 5 mph.
Wednesday Night
Partly cloudy, with a low around 56. Calm wind becoming north around 5 mph after midnight.
Thursday
Mostly sunny, with a high near 68. North wind around 5 mph becoming calm in the afternoon.
Thursday Night
Showers likely and possibly a thunderstorm after 2am. Mostly cloudy, with a low around 52. Chance of precipitation is 70%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Friday
Showers likely. Mostly cloudy, with a high near 73. Chance of precipitation is 70%.
Friday Night
Partly cloudy, with a low around 43.
Saturday
Sunny, with a high near 53.
Saturday Night
Mostly clear, with a low around 35.
Sunday
Sunny, with a high near 56.
Sunday Night
Mostly clear, with a low around 37.
Monday
Mostly sunny, with a high near 63.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Princeton NJSimilar City Names
 40.35°N 74.67°W (Elev. 190 ft)
Last Update:
9:58 am EDT Oct 13, 2026
Forecast Valid:
12pm EDT Oct 13, 2026-6pm EDT Oct 19, 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