South Mountain Reservation Weather Forecast

    • 61
    • 85

    Rain

    • 52
    • 72

    Rain

    • 53
    • 73

    Mostly Sunny

    • 55
    • 73

    Mostly Cloudy

    • 54
    • 71

    Partly Sunny

    • 54
    • 80

    Mostly Sunny

    • 51
    • 72

    Mostly Sunny

Today 6 Sep Western Essex

Showers and Thunderstorms. Some Thunderstorms may be severe with damaging Winds, large Hail, frequent Lightning, and heavy rainfall. Highs in the mid 80s. Southwest Winds around 10 Mph with Gusts up to 25 Mph. Chance of rain 90 percent.

Tonight 6 Sep Western Essex

Showers likely this Evening, then rain likely after midnight. Lows in the lower 60s. North Winds around 5 Mph. Chance of rain 70 percent.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

South Mountain Reservation Temperature Statistics

September Temperature

Morristown Municipal (7.5 miles)

  • Lowest 3 September, 2025

    50 °F

  • Average September

    67.5 °F

  • Highest 3 September, 2025

    80.6 °F

Climate (2020–Present)

Morristown Municipal (7.5 miles)

Take a look at our website widgetsAvailable free! Find Out More

  • Average Low 2020–2025

    43.4 °F

  • Average 2020–2025

    52 °F

  • Average High 2020–2025

    64.3 °F
Get WillyWeather+ to remove ads