Old Furnace Weather Forecast

    • 60
    • 85

    Becoming Sunny

    • 51
    • 83

    Mostly Sunny

    • 56
    • 77

    Partly Sunny

    • 61
    • 74

    Mostly Cloudy

    • 61
    • 81

    Partly Sunny

    • 62
    • 84

    Chance Rain Showers

Today 18 Sep Union

Patchy fog this morning. Sunny. Very warm with Highs in the mid 80s. Northwest Winds around 5 Mph.

Tonight 18 Sep Union

Mostly clear. Lows in the upper 50s. Northwest Winds around 5 Mph.

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Old Furnace Temperature Statistics

September Temperature

Williamsport - Lycoming County Airport (11.2 miles)

  • Lowest 8 September, 2025

    44.1 °F

  • Average September

    64.6 °F

  • Highest 13 September, 2025

    86 °F

Climate (2020–Present)

Williamsport - Lycoming County Airport (11.2 miles)

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  • Average Low 2020–2025

    43.9 °F

  • Average 2020–2025

    53.1 °F

  • Average High 2020–2025

    63.3 °F
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