Mercersburg Weather Forecast

    • 21
    • 43

    Snow

    • 17
    • 24

    Partly Sunny

    • 19
    • 28

    Mostly Cloudy

    • 25
    • 38

    Partly Sunny

    • 30
    • 49

    Mostly Cloudy

    • 33
    • 51

    Rain Showers Likely

    • 27
    • 44

    Partly Sunny

Today 13 Dec Franklin

Mostly cloudy with a 40 percent chance of snow Showers. Little or no snow accumulation. Highs in the lower 40s. West Winds around 5 Mph.

Tonight 13 Dec Franklin

Snow. Snow accumulation around an inch. Lows in the lower 20s. Northwest Winds 5 to 10 Mph. Chance of snow 90 percent.

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Mercersburg Temperature Statistics

December Temperature

Hagerstown, Washington County Regional Airport (12.4 miles)

  • Lowest 9 December, 2025

    14 °F

  • Average December

    32.4 °F

  • Highest 7 December, 2025

    44.6 °F

Climate (2020–Present)

Hagerstown, Washington County Regional Airport (12.4 miles)

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  • Average Low 2020–2025

    47.8 °F

  • Average 2020–2025

    56.8 °F

  • Average High 2020–2025

    65.8 °F
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