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

35°F

2°C

Humidity 70%
Wind Speed Calm
Barometer 30.11 in (1019.2 mb)
Dewpoint 26°F (-3°C)
Visibility 10.00 mi
Last update 20 Mar 4:53 am EDT
Extended Forecast for

Trenton, Mercer County Airport NJ

  • Today

    Today: Mostly sunny, with a high near 63. South wind 5 to 10 mph increasing to 10 to 15 mph in the afternoon. Winds could gust as high as 30 mph.

    High: 63 °F

    Mostly Sunny

  • Tonight

    Tonight: Showers likely, mainly before 10pm. Mostly cloudy, with a low around 45. South wind 5 to 15 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 45 °F

    Showers
    Likely then
    Slight Chance
    Showers

  • Saturday

    Saturday: Sunny, with a high near 58. Northwest wind around 10 mph.

    High: 58 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 39. North wind around 5 mph becoming south after midnight.

    Low: 39 °F

    Mostly Cloudy

  • Sunday

    Sunday: Partly sunny, with a high near 66. South wind 10 to 15 mph.

    High: 66 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: Showers likely, mainly after 2am. Mostly cloudy, with a low around 47. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 47 °F

    Showers
    Likely

  • Monday

    Monday: Showers likely, mainly before 8am. Partly sunny, with a high near 55. Chance of precipitation is 60%.

    High: 55 °F

    Showers
    Likely

  • Monday Night

    Monday Night: Partly cloudy, with a low around 30.

    Low: 30 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 48.

    High: 48 °F

    Mostly Sunny

Detailed Forecast

Today
Mostly sunny, with a high near 63. South wind 5 to 10 mph increasing to 10 to 15 mph in the afternoon. Winds could gust as high as 30 mph.
Tonight
Showers likely, mainly before 10pm. Mostly cloudy, with a low around 45. South wind 5 to 15 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.
Saturday
Sunny, with a high near 58. Northwest wind around 10 mph.
Saturday Night
Mostly cloudy, with a low around 39. North wind around 5 mph becoming south after midnight.
Sunday
Partly sunny, with a high near 66. South wind 10 to 15 mph.
Sunday Night
Showers likely, mainly after 2am. Mostly cloudy, with a low around 47. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.
Monday
Showers likely, mainly before 8am. Partly sunny, with a high near 55. Chance of precipitation is 60%.
Monday Night
Partly cloudy, with a low around 30.
Tuesday
Mostly sunny, with a high near 48.
Tuesday Night
Mostly cloudy, with a low around 35.
Wednesday
Partly sunny, with a high near 52.
Wednesday Night
A chance of rain. Mostly cloudy, with a low around 34. Chance of precipitation is 30%.
Thursday
A chance of rain. Partly sunny, with a high near 55. Chance of precipitation is 30%.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Trenton, Mercer County Airport NJ
 40.27°N 74.8°W (Elev. 157 ft)
Last Update:
4:09 am EDT Mar 20, 2026
Forecast Valid:
5am EDT Mar 20, 2026-6pm EDT Mar 26, 2026
 
Forecast Discussion
 
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Additional Resources

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation