Lake Hopatcong Weather Forecast

    • 54
    • 74

    Chance Rain Showers

    • 58
    • 69

    Chance Rain Showers

    • 58
    • 79

    Partly Sunny

    • 52
    • 80

    Mostly Sunny

    • 51
    • 71

    Partly Sunny

    • 52
    • 73

    Partly Sunny

Today 16 Sep Morris

Mostly cloudy this Morning, then becoming partly sunny. Highs in the mid 70s. Northeast Winds 5 to 10 Mph.

Tonight 16 Sep Morris

Mostly cloudy. A slight chance of Showers in the Evening, then a chance of Showers with a slight chance of Thunderstorms after midnight. Lows in the mid 50s. East Winds 5 to 10 Mph. Chance of rain 50 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Lake Hopatcong Temperature Statistics

September Temperature

Andover, Aeroflex-Andover Airport (7.5 miles)

  • Lowest 8 September, 2025

    46 °F

  • Average September

    64.4 °F

  • Highest 6 September, 2025

    82.9 °F

Climate (2020–Present)

Andover, Aeroflex-Andover Airport (7.5 miles)

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  • Average Low 2020–2025

    44.1 °F

  • Average 2020–2025

    53.8 °F

  • Average High 2020–2025

    63.8 °F
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