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.

Overcast

56°F

13°C

Humidity 67%
Wind Speed Calm
Barometer 29.91 in (1012.2 mb)
Dewpoint 45°F (7°C)
Visibility 10.00 mi
Last update 9 May 12:53 am EDT
Extended Forecast for

Princeton NJSimilar City Names

  • Overnight

    Overnight: Mostly cloudy, with a low around 48. Calm wind becoming southeast around 5 mph.

    Low: 48 °F

    Mostly Cloudy

  • Saturday

    Saturday: Showers and possibly a thunderstorm, mainly before 4pm, then a chance of showers and thunderstorms after 4pm. High near 66. South wind around 5 mph becoming southwest in the afternoon. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 66 °F

    Showers

  • Saturday Night

    Saturday Night: A chance of showers and thunderstorms before 8pm, then a slight chance of showers between 8pm and 9pm. Patchy fog after 10pm. Otherwise, increasing clouds, with a low around 50. Calm wind. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 50 °F

    Chance
    Showers and
    Patchy Fog
    then Patchy
    Fog

  • Sunday

    Sunday: A slight chance of showers after 2pm. Cloudy, then gradually becoming mostly sunny, with a high near 78. Light west wind increasing to 5 to 10 mph in the afternoon. Chance of precipitation is 20%.

    High: 78 °F

    Mostly Cloudy
    then Slight
    Chance
    Showers

  • Sunday Night

    Sunday Night: Showers, mainly after 2am. Low around 50. Calm wind becoming north around 5 mph. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 50 °F

    Chance
    Showers then
    Showers

  • Monday

    Monday: Showers, mainly before 2pm. High near 61. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.

    High: 61 °F

    Showers

  • Monday Night

    Monday Night: A chance of showers before 8pm. Partly cloudy, with a low around 41. Chance of precipitation is 30%.

    Low: 41 °F

    Chance
    Showers then
    Partly Cloudy

  • Tuesday

    Tuesday: Sunny, with a high near 64.

    High: 64 °F

    Sunny

  • Tuesday Night

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

    Low: 43 °F

    Partly Cloudy

Detailed Forecast

Overnight
Mostly cloudy, with a low around 48. Calm wind becoming southeast around 5 mph.
Saturday
Showers and possibly a thunderstorm, mainly before 4pm, then a chance of showers and thunderstorms after 4pm. High near 66. South wind around 5 mph becoming southwest in the afternoon. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Saturday Night
A chance of showers and thunderstorms before 8pm, then a slight chance of showers between 8pm and 9pm. Patchy fog after 10pm. Otherwise, increasing clouds, with a low around 50. Calm wind. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Sunday
A slight chance of showers after 2pm. Cloudy, then gradually becoming mostly sunny, with a high near 78. Light west wind increasing to 5 to 10 mph in the afternoon. Chance of precipitation is 20%.
Sunday Night
Showers, mainly after 2am. Low around 50. Calm wind becoming north around 5 mph. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.
Monday
Showers, mainly before 2pm. High near 61. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.
Monday Night
A chance of showers before 8pm. Partly cloudy, with a low around 41. Chance of precipitation is 30%.
Tuesday
Sunny, with a high near 64.
Tuesday Night
Partly cloudy, with a low around 43.
Wednesday
Showers likely, mainly after 2pm. Mostly cloudy, with a high near 64. Chance of precipitation is 60%.
Wednesday Night
Showers likely. Mostly cloudy, with a low around 47. Chance of precipitation is 70%.
Thursday
Showers likely. Mostly cloudy, with a high near 66. Chance of precipitation is 60%.
Thursday Night
A chance of showers. Mostly cloudy, with a low around 47. Chance of precipitation is 30%.
Friday
Partly sunny, with a high near 70.
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ABOUT THIS FORECAST

 
Point Forecast:
Princeton NJSimilar City Names
 40.35°N 74.67°W (Elev. 190 ft)
Last Update:
4:08 pm EDT May 8, 2026
Forecast Valid:
12am EDT May 9, 2026-6pm EDT May 15, 2026
 
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Additional Resources

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Chance of Precipitation