Union Weather Forecast

    • 23
    • 58

    Rain Likely

    • 28
    • 38

    Partly Sunny

    • 22
    • 44

    Mostly Sunny

    • 25
    • 36

    Chance Rain/Snow

    • 30
    • 39

    Chance Rain/Snow

    • 27
    • 43

    Chance Freezing Rain

Today 19 Dec Hunterdon

Rain with a slight chance of Thunderstorms this Morning, then partly sunny with a chance of rain this afternoon. Not as cool with Highs in the upper 50s. Temperature falling into the lower 40s this afternoon. South Winds 15 to 20 Mph, becoming west this afternoon. Gusts up to 40 Mph. Chance of rain near 100 percent.

Tonight 19 Dec Hunterdon

Partly cloudy in the Evening, then clearing. Much Colder with Lows in the lower 20s. West Winds 15 to 20 Mph with Gusts up to 45 Mph.

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  • Temperature Forecast NOAA

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Union Temperature Statistics

December Temperature

Somerville, Somerset Airport (14.9 miles)

  • Lowest 9 December, 2025

    7 °F

  • Average December

    28.9 °F

  • Highest 17 December, 2025

    46.9 °F

Climate (2020–Present)

Somerville, Somerset Airport (14.9 miles)

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  • Average Low 2020–2025

    43.2 °F

  • Average 2020–2025

    54.4 °F

  • Average High 2020–2025

    65.8 °F
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