Delaware River - Trenton Weather Forecast

    • 43
    • 49

    Rain

    • 25
    • 56

    Rain

    • 33
    • 40

    Mostly Cloudy

    • 24
    • 48

    Mostly Sunny

    • 24
    • 36

    Partly Sunny

    • 33
    • 41

    Chance Rain/Snow

Today 18 Dec Mercer

Mostly sunny. Highs in the upper 40s. East Winds around 5 Mph.

Tonight 18 Dec Mercer

A chance of rain in the Evening, then rain with a slight chance of Thunderstorms after midnight. Not as cool with Lows in the lower 40s. Temperature rising into the mid 50s after midnight. Southeast Winds around 5 Mph, becoming south 10 to 15 Mph with Gusts up to 35 Mph after midnight. Chance of rain near 100 percent.

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Delaware River - Trenton Temperature Statistics

December Temperature

Trenton, Mercer County Airport (6.8 miles)

  • Lowest 9 December, 2025

    10.9 °F

  • Average December

    30 °F

  • Highest 10 December, 2025

    43 °F

Climate (2020–Present)

Trenton, Mercer County Airport (6.8 miles)

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  • Average Low 2020–2025

    46.1 °F

  • Average 2020–2025

    55.3 °F

  • Average High 2020–2025

    64.3 °F
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