South Mountain Reservation Weather Forecast

    • 24
    • 40

    Mostly Cloudy

    • 14
    • 29

    Partly Sunny

    • 28
    • 32

    Mostly Cloudy

    • 32
    • 43

    Chance Rain

    • 28
    • 41

    Chance Snow

    • 21
    • 38

    Chance Rain/Snow

Today 7 Dec Western Essex

Partly sunny in the Morning, then becoming mostly cloudy. Highs around 40. Northwest Winds around 5 Mph, becoming southwest around 5 Mph in the afternoon.

Tonight 7 Dec Western Essex

Partly cloudy. Lows in the mid 20s. West Winds 5 to 10 Mph with Gusts up to 20 Mph.

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South Mountain Reservation Temperature Statistics

December Temperature

Morristown Municipal (7.5 miles)

  • Lowest 4 December, 2025

    21.2 °F

  • Average December

    31.1 °F

  • Highest 1 December, 2025

    42.8 °F

Climate (2020–Present)

Morristown Municipal (7.5 miles)

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  • Average Low 2020–2025

    43.3 °F

  • Average 2020–2025

    51.9 °F

  • Average High 2020–2025

    64.2 °F
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