Union Weather Forecast

    • 54
    • 74

    Increasing Clouds

    • 49
    • 75

    Mostly Sunny

    • 53
    • 76

    Mostly Sunny

    • 54
    • 81

    Mostly Sunny

    • 60
    • 86

    Mostly Sunny

    • 66
    • 90

    Partly Sunny

    • 65
    • 90

    Partly Sunny

Today 31 May Hunterdon

Sunny. Highs in the mid 70s. Northwest Winds 5 to 10 Mph.

Tonight 31 May Hunterdon

Partly cloudy. Not as cool with Lows in the mid 50s. West Winds 5 to 10 Mph, becoming northwest after midnight.

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Union Temperature Statistics

May Temperature

Somerville, Somerset Airport (14.9 miles)

  • Lowest 4 May, 2026

    33.1 °F

  • Average May

    61.4 °F

  • Highest 19 May, 2026

    95 °F

Climate (2021–Present)

Somerville, Somerset Airport (14.9 miles)

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  • Average Low 2021–2026

    43.1 °F

  • Average 2021–2026

    54.3 °F

  • Average High 2021–2026

    65.7 °F
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