Bethesda Weather Forecast

    • 70
    • 88

    Thunderstorms

    • 65
    • 86

    Chance Thunderstorms

    • 58
    • 80

    Partly Sunny

    • 56
    • 78

    Mostly Sunny

    • 58
    • 79

    Mostly Sunny

    • 60
    • 81

    Partly Sunny

Today 3 Sep Lancaster

Showers with a chance of Thunderstorms this Morning, then a slight chance of Showers and Thunderstorms this afternoon. Some Thunderstorms may produce gusty Winds, frequent Lightning, and heavy rainfall this morning. Some Thunderstorms may produce heavy rainfall this afternoon. Hot with Highs in the upper 80s. West Winds 5 to 10 Mph. Chance of rain near 100 percent.

Tonight 3 Sep Lancaster

Mostly cloudy. Showers with a chance of Thunderstorms in the Evening, then a chance of Showers and Thunderstorms after midnight. Some Thunderstorms may produce heavy rainfall in the evening. Warm with Lows around 70. West Winds around 5 Mph. Chance of rain 90 percent.

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Bethesda Temperature Statistics

September Temperature

Lancaster, Lancaster Airport (18.6 miles)

  • Lowest 1 September, 2026

    70 °F

  • Average September

    77.7 °F

  • Highest 1 September, 2026

    89.1 °F

Climate (2021–2026)

Lancaster, Lancaster Airport (18.6 miles)

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  • Average Low 2021–2026

    45.8 °F

  • Average 2021–2026

    55.5 °F

  • Average High 2021–2026

    65.1 °F
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