Mercersburg Weather Forecast

    • 65
    • 88

    Increasing Clouds

    • 70
    • 90

    Chance Rain Showers

    • 68
    • 84

    Rain Showers Likely

    • 65
    • 84

    Chance Thunderstorms

    • 66
    • 86

    Chance Rain Showers

    • 68
    • 88

    Chance Thunderstorms

Today 31 Jul Franklin

Sunny. Highs in the upper 80s. North Winds around 5 Mph.

Tonight 31 Jul Franklin

Mostly clear in the Evening, then becoming partly cloudy. Lows in the mid 60s. Light and variable Winds.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Mercersburg Temperature Statistics

July Temperature

Hagerstown, Washington County Regional Airport (12.4 miles)

  • Lowest 24 July, 2026

    54.6 °F

  • Average July

    78.6 °F

  • Highest 2 July, 2026

    99.6 °F

Climate (2021–2026)

Hagerstown, Washington County Regional Airport (12.4 miles)

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  • Average Low 2021–2026

    47.8 °F

  • Average 2021–2026

    56.8 °F

  • Average High 2021–2026

    66 °F
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