Mercersburg Weather Forecast

    • 71
    • 85

    Rain Showers Likely

    • 65
    • 90

    Chance Thunderstorms

    • 59
    • 85

    Mostly Sunny

    • 63
    • 82

    Partly Sunny

    • 68
    • 88

    Partly Sunny

    • 72
    • 95

    Slight Chance Thunderstorms

Today 19 Jul Franklin

Mostly cloudy with a chance of Showers. A chance of Thunderstorms this afternoon. Highs in the lower 80s. East Winds around 5 Mph, becoming southeast this afternoon. Chance of rain 50 percent.

Tonight 19 Jul Franklin

Mostly cloudy. A chance of Showers and Thunderstorms in the evening. Warm with Lows around 70. Southeast Winds around 5 Mph, becoming southwest after midnight. Chance of rain 30 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Mercersburg Temperature Statistics

July Temperature

Hagerstown, Washington County Regional Airport (12.4 miles)

  • Lowest 5 July, 2025

    63.6 °F

  • Average July

    80.7 °F

  • Highest 7 July, 2025

    94.6 °F

Climate (2020–Present)

Hagerstown, Washington County Regional Airport (12.4 miles)

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  • Average Low 2020–2025

    48 °F

  • Average 2020–2025

    56.9 °F

  • Average High 2020–2025

    65.9 °F
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