Round Rock Weather Forecast

    • 70
    • 94

    Slight Chance Thunderstorms

    • 71
    • 94

    Slight Chance Thunderstorms

    • 70
    • 95

    Mostly Sunny

    • 71
    • 95

    Mostly Sunny

    • 73
    • 94

    Mostly Sunny

    • 73
    • 95

    Mostly Sunny

    • 71
    • 93

    Chance Thunderstorms

Today 16 Sep Williamson

Sunny this Morning, then partly cloudy with a slight chance of Showers and Thunderstorms this afternoon. Highs in the lower 90s. Southwest Winds around 5 Mph, becoming southeast around 5 Mph this afternoon.

Tonight 16 Sep Williamson

Clear. Lows in the upper 60s. Southeast Winds around 5 Mph, becoming southwest after midnight.

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Round Rock Temperature Statistics

September Temperature

Austin Executive Airport (10.6 miles)

  • Lowest 9 September, 2025

    64.4 °F

  • Average September

    81.2 °F

  • Highest 4 September, 2025

    102.2 °F

Climate (2020–Present)

Austin Executive Airport (10.6 miles)

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  • Average Low 2020–2025

    59.1 °F

  • Average 2020–2025

    68.9 °F

  • Average High 2020–2025

    79.9 °F
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