Round Rock Weather Forecast

    • 77
    • 94

    Chance Rain Showers

    • 73
    • 90

    Rain Showers

    • 70
    • 82

    Rain Showers

    • 69
    • 80

    Rain Showers Likely

    • 68
    • 80

    Rain Showers Likely

    • 65
    • 80

    Mostly Cloudy

Today 30 Sep Williamson

Mostly cloudy with a slight chance of Showers in the Morning, then partly cloudy with a chance of Showers with a slight chance of Thunderstorms in the afternoon. Humid with Highs in the mid 90s. South Winds 15 to 20 Mph with Gusts up to 30 Mph. Chance of rain 30 percent. Highest heat index Readings up to 106.

Tonight 30 Sep Williamson

Partly cloudy in the Evening, then becoming cloudy. A slight chance of Thunderstorms. A slight chance of Showers in the Evening, then a chance of Showers after midnight. Some Thunderstorms may produce heavy rainfall. Lows in the mid 70s. Southeast Winds 10 to 15 Mph with Gusts up to 30 Mph. Chance of rain 50 percent.

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Round Rock Temperature Statistics

September Temperature

Austin Executive Airport (10.6 miles)

  • Lowest 27 September, 2026

    69.3 °F

  • Average September

    85.4 °F

  • Highest 2 September, 2026

    102.6 °F

Climate (2021–2026)

Austin Executive Airport (10.6 miles)

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  • Average Low 2021–2026

    60 °F

  • Average 2021–2026

    69.9 °F

  • Average High 2021–2026

    81 °F
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