Letterkenny Reservoir Weather Forecast

    • 66
    • 88

    Chance Thunderstorms

    • 58
    • 80

    Partly Sunny

    • 55
    • 78

    Mostly Sunny

    • 57
    • 80

    Mostly Sunny

    • 61
    • 82

    Partly Sunny

    • 68
    • 86

    Slight Chance Thunderstorms

Today 4 Sep Franklin

Partly sunny with a chance of Showers and Thunderstorms. Very warm with Highs in the upper 80s. Northwest Winds 5 to 10 Mph. Chance of rain 50 percent.

Tonight 4 Sep Franklin

Mostly cloudy. A slight chance of Showers this evening. Lows in the upper 60s. Northwest Winds 5 to 10 Mph. Chance of rain 20 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Letterkenny Reservoir Temperature Statistics

September Temperature

Hagerstown, Washington County Regional Airport (28 miles)

  • Lowest 2 September, 2026

    71.1 °F

  • Average September

    80 °F

  • Highest 1 September, 2026

    93.7 °F

Climate (2021–2026)

Hagerstown, Washington County Regional Airport (28 miles)

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  • Average Low 2021–2026

    47.7 °F

  • Average 2021–2026

    56.8 °F

  • Average High 2021–2026

    66 °F
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