Olney Weather Forecast

    • 58
    • 81

    Becoming Sunny

    • 60
    • 85

    Mostly Sunny

    • 61
    • 76

    Mostly Cloudy

    • 60
    • 74

    Mostly Cloudy

    • 61
    • 77

    Partly Sunny

    • 63
    • 82

    Partly Sunny

Today 18 Sep Central and Southeast Montgomery

Mostly sunny. Highs in the lower 80s. Northwest Winds around 5 Mph.

Tonight 18 Sep Central and Southeast Montgomery

Mostly clear. Lows in the upper 50s. West Winds around 5 Mph.

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Olney Temperature Statistics

September Temperature

Gaithersburg - Montgomery County Airport (5 miles)

  • Lowest 9 September, 2025

    48.2 °F

  • Average September

    67.4 °F

  • Highest 6 September, 2025

    89.1 °F

Climate (2020–Present)

Gaithersburg - Montgomery County Airport (5 miles)

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  • Average Low 2020–2025

    46.3 °F

  • Average 2020–2025

    56 °F

  • Average High 2020–2025

    65.9 °F
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