Old Town Square Annex Weather Forecast

    • 77
    • 93

    Slight Chance Thunderstorms

    • 76
    • 96

    Mostly Sunny

    • 77
    • 97

    Slight Chance Thunderstorms

    • 77
    • 98

    Hot

    • 77
    • 98

    Hot

    • 77
    • 97

    Hot

Today 4 Sep Williamson

Mostly cloudy this Morning, then becoming partly cloudy. A slight chance of Thunderstorms. A chance of Showers, mainly this morning. Highs in the lower 90s. South Winds 5 to 10 Mph. Chance of rain 50 percent.

Tonight 4 Sep Williamson

Mostly clear. Lows in the mid 70s. South Winds 5 to 10 Mph.

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Old Town Square Annex Temperature Statistics

September Temperature

Austin Executive Airport (11.2 miles)

  • Lowest 2 September, 2026

    74.8 °F

  • Average September

    87 °F

  • Highest 2 September, 2026

    102.6 °F

Climate (2021–2026)

Austin Executive Airport (11.2 miles)

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  • Average Low 2021–2026

    59.8 °F

  • Average 2021–2026

    69.8 °F

  • Average High 2021–2026

    80.9 °F
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