Hopatcong Weather Forecast

    • 57
    • 78

    Partly Sunny

    • 54
    • 75

    Partly Sunny

    • 54
    • 76

    Mostly Sunny

    • 59
    • 79

    Mostly Cloudy

    • 67
    • 81

    Chance Rain Showers

    • 57
    • 79

    Partly Sunny

Today 5 Sep Sussex

Mostly sunny. Highs in the upper 70s. North Winds around 5 Mph.

Tonight 5 Sep Sussex

Partly cloudy. Lows in the mid 50s. North Winds around 5 Mph in the Evening, becoming light and variable.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Hopatcong Temperature Statistics

September Temperature

Andover, Aeroflex-Andover Airport (6.2 miles)

  • Lowest 2 September, 2026

    66 °F

  • Average September

    69.9 °F

  • Highest 1 September, 2026

    84 °F

Climate (2021–2026)

Andover, Aeroflex-Andover Airport (6.2 miles)

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  • Average Low 2021–2026

    43.7 °F

  • Average 2021–2026

    53.5 °F

  • Average High 2021–2026

    63.6 °F
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