Round Rock Weather Forecast

    • 54
    • 60

    Slight Chance Rain Showers

    • 59
    • 66

    Cloudy

    • 41
    • 76

    Mostly Sunny

    • 51
    • 67

    Mostly Sunny

    • 55
    • 78

    Mostly Sunny

    • 55
    • 79

    Partly Sunny

Today 16 Dec Williamson

Cloudy. Highs in the lower 60s. South Winds 10 to 15 Mph.

Tonight 16 Dec Williamson

Cloudy. Patchy fog after midnight. Not as cool with Lows in the lower 50s. South Winds 5 to 10 Mph.

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Round Rock Temperature Statistics

December Temperature

Austin Executive Airport (10.6 miles)

  • Lowest 9 December, 2025

    32 °F

  • Average December

    51.8 °F

  • Highest 13 December, 2025

    77 °F

Climate (2020–Present)

Austin Executive Airport (10.6 miles)

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  • Average Low 2020–2025

    59.4 °F

  • Average 2020–2025

    69.2 °F

  • Average High 2020–2025

    80.2 °F
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