Hopatcong Weather Forecast

    • 64
    • 77

    Rain Showers

    • 59
    • 77

    Rain Showers

    • 48
    • 71

    Mostly Sunny

    • 53
    • 71

    Partly Sunny

    • 59
    • 77

    Partly Sunny

    • 59
    • 79

    Slight Chance Rain Showers

Today 12 Sep Sussex

Sunny this Morning, then becoming partly sunny. Patchy fog this morning. Highs in the upper 70s. East Winds around 5 Mph, becoming south around 5 Mph this afternoon.

Tonight 12 Sep Sussex

Mostly cloudy. A chance of Showers with a slight chance of Thunderstorms in the Evening, then Showers with a chance of Thunderstorms after midnight. Patchy fog after midnight. Not as cool with Lows in the lower 60s. Southeast Winds around 5 Mph. Chance of rain 90 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Hopatcong Temperature Statistics

September Temperature

Andover, Aeroflex-Andover Airport (6.2 miles)

  • Lowest 7 September, 2026

    52 °F

  • Average September

    69.2 °F

  • Highest 3 September, 2026

    86 °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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