Siena Weather Forecast

    • 75
    • 96

    Chance Thunderstorms

    • 76
    • 98

    Hot

    • 74
    • 99

    Hot

    • 75
    • 98

    Hot

    • 75
    • 98

    Hot

    • 75
    • 99

    Hot

Today 6 Sep Williamson

Partly cloudy with a slight chance of Thunderstorms. A slight chance of Showers in the Morning, then a chance of Showers in the afternoon. Highs in the mid 90s. South Winds around 5 Mph, becoming southeast around 5 Mph in the afternoon. Chance of rain 40 percent.

Tonight 6 Sep Williamson

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

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Siena Temperature Statistics

September Temperature

Georgetown, Georgetown Municipal Airport (10.6 miles)

  • Lowest 1 September, 2026

    75.9 °F

  • Average September

    87.4 °F

  • Highest 2 September, 2026

    102 °F

Climate (2021–2026)

Georgetown, Georgetown Municipal Airport (10.6 miles)

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  • Average Low 2021–2026

    59.6 °F

  • Average 2021–2026

    70 °F

  • Average High 2021–2026

    80.9 °F
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