Halfway Lake Weather Forecast

    • 55
    • 82

    Mostly Sunny

    • 47
    • 80

    Mostly Sunny

    • 53
    • 74

    Partly Sunny

    • 56
    • 71

    Mostly Cloudy

    • 58
    • 78

    Partly Sunny

    • 58
    • 80

    Chance Rain Showers

Today 18 Sep Union

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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  • Temperature Real-Time

Halfway Lake Temperature Statistics

September Temperature

Selinsgrove Penn Valley Airport (20.5 miles)

  • Lowest 8 September, 2025

    39.9 °F

  • Average September

    63.4 °F

  • Highest 13 September, 2025

    84 °F

Climate (2020–Present)

Selinsgrove Penn Valley Airport (20.5 miles)

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  • Average Low 2020–2025

    42.4 °F

  • Average 2020–2025

    52.7 °F

  • Average High 2020–2025

    63.2 °F
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