Halfway Lake Weather Forecast

    • 49
    • 71

    Rain

    • 46
    • 65

    Rain Showers

    • 44
    • 57

    Rain Showers Likely

    • 44
    • 57

    Slight Chance Rain Showers

    • 44
    • 59

    Chance Rain Showers

    • 45
    • 63

    Chance Rain Showers

Today 20 Sep Union

Rain likely this Morning, then Showers with a slight chance of Thunderstorms this afternoon. Highs in the lower 70s. South Winds 5 to 10 Mph with Gusts up to 20 Mph, becoming west this afternoon. Chance of rain near 100 percent.

Tonight 20 Sep Union

Mostly cloudy. A chance of Showers in the evening. Lows in the mid 50s. North Winds 5 to 10 Mph with Gusts up to 20 Mph. Chance of rain 50 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Halfway Lake Temperature Statistics

September Temperature

Selinsgrove Penn Valley Airport (20.5 miles)

  • Lowest 15 September, 2026

    46 °F

  • Average September

    69.2 °F

  • Highest 1 September, 2026

    90 °F

Climate (2021–2026)

Selinsgrove Penn Valley Airport (20.5 miles)

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  • Average Low 2021–2026

    42.3 °F

  • Average 2021–2026

    52.7 °F

  • Average High 2021–2026

    63.1 °F
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