Lawrenceville Weather Forecast

    • 40
    • 48

    Rain

    • 25
    • 55

    Rain

    • 31
    • 39

    Mostly Cloudy

    • 22
    • 46

    Mostly Sunny

    • 23
    • 35

    Partly Sunny

    • 31
    • 39

    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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Lawrenceville Temperature Statistics

December Temperature

Trenton, Mercer County Airport (4.3 miles)

  • Lowest 9 December, 2025

    10.9 °F

  • Average December

    29.6 °F

  • Highest 10 December, 2025

    43 °F

Climate (2020–Present)

Trenton, Mercer County Airport (4.3 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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