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

56°F

13°C

Humidity 72%
Wind Speed S 3 mph
Barometer 29.83 in (1009.4 mb)
Dewpoint 47°F (8°C)
Visibility 10.00 mi
Last update 5 May 2:53 am EDT
Extended Forecast for

Trenton, Mercer County Airport NJ

  • Overnight

    Overnight: Mostly clear, with a low around 56. South wind around 5 mph.

    Low: 56 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 84. Breezy, with a southwest wind 10 to 20 mph, with gusts as high as 30 mph.

    High: 84 °F

    Sunny then
    Sunny and
    Breezy

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 61. South wind 10 to 15 mph, with gusts as high as 25 mph.

    Low: 61 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Showers, mainly after 2pm. High near 71. South wind 10 to 15 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 71 °F

    Chance
    Showers then
    Showers

  • Wednesday Night

    Wednesday Night: Showers and possibly a thunderstorm before 2am, then a chance of showers. Low around 50. South wind around 5 mph becoming west after midnight. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 50 °F

    Showers

  • Thursday

    Thursday: Showers likely, mainly between 8am and 2pm. Mostly cloudy, with a high near 61. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 61 °F

    Showers
    Likely

  • Thursday Night

    Thursday Night: A chance of showers before 2am. Mostly cloudy, with a low around 43. Chance of precipitation is 30%.

    Low: 43 °F

    Chance
    Showers

  • Friday

    Friday: Mostly sunny, with a high near 65.

    High: 65 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 47.

    Low: 47 °F

    Partly Cloudy

Detailed Forecast

Overnight
Mostly clear, with a low around 56. South wind around 5 mph.
Tuesday
Sunny, with a high near 84. Breezy, with a southwest wind 10 to 20 mph, with gusts as high as 30 mph.
Tuesday Night
Mostly cloudy, with a low around 61. South wind 10 to 15 mph, with gusts as high as 25 mph.
Wednesday
Showers, mainly after 2pm. High near 71. South wind 10 to 15 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.
Wednesday Night
Showers and possibly a thunderstorm before 2am, then a chance of showers. Low around 50. South wind around 5 mph becoming west after midnight. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Thursday
Showers likely, mainly between 8am and 2pm. Mostly cloudy, with a high near 61. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.
Thursday Night
A chance of showers before 2am. Mostly cloudy, with a low around 43. Chance of precipitation is 30%.
Friday
Mostly sunny, with a high near 65.
Friday Night
Partly cloudy, with a low around 47.
Saturday
A chance of showers after 2pm. Partly sunny, with a high near 68. Chance of precipitation is 40%.
Saturday Night
A chance of showers. Partly cloudy, with a low around 46. Chance of precipitation is 30%.
Sunday
Mostly sunny, with a high near 74.
Sunday Night
A chance of showers. Mostly cloudy, with a low around 51. Chance of precipitation is 30%.
Monday
A chance of showers. Mostly cloudy, with a high near 70. Chance of precipitation is 50%.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Trenton, Mercer County Airport NJ
 40.28°N 74.83°W (Elev. 200 ft)
Last Update:
4:08 pm EDT May 4, 2026
Forecast Valid:
3am EDT May 5, 2026-6pm EDT May 11, 2026
 
Forecast Discussion
 
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Additional Resources

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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