Siena Weather Forecast

    • 74
    • 100

    Hot

    • 74
    • 99

    Hot

    • 71
    • 89

    Chance Rain Showers

    • 68
    • 87

    Rain Showers Likely

    • 65
    • 86

    Chance Rain Showers

    • 65
    • 90

    Mostly Sunny

Today 4 Sep Williamson

Mostly sunny. Hot with Highs around 100. Southwest Winds around 5 Mph.

Tonight 4 Sep Williamson

Partly cloudy. Lows in the mid 70s. South Winds 5 to 10 Mph.

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Siena Temperature Statistics

September Temperature

Georgetown, Georgetown Municipal Airport (10.6 miles)

  • Lowest 1 September, 2025

    71.1 °F

  • Average September

    81.4 °F

  • Highest 2 September, 2025

    95 °F

Climate (2020–Present)

Georgetown, Georgetown Municipal Airport (10.6 miles)

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  • Average Low 2020–2025

    58.7 °F

  • Average 2020–2025

    69 °F

  • Average High 2020–2025

    79.8 °F
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