Lake Forest Weather Forecast

    • 76
    • 97

    Hot

    • 76
    • 98

    Hot

    • 75
    • 99

    Hot

    • 75
    • 100

    Hot

    • 75
    • 100

    Hot

    • 74
    • 100

    Hot

Today 7 Sep Williamson

Partly cloudy. Highs in the upper 90s. South Winds around 5 Mph. Highest heat index Readings up to 105.

Tonight 7 Sep Williamson

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

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Lake Forest Temperature Statistics

September Temperature

Austin Executive Airport (8.1 miles)

  • Lowest 2 September, 2026

    74.8 °F

  • Average September

    86 °F

  • Highest 2 September, 2026

    102.6 °F

Climate (2021–2026)

Austin Executive Airport (8.1 miles)

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  • Average Low 2021–2026

    59.9 °F

  • Average 2021–2026

    69.8 °F

  • Average High 2021–2026

    80.9 °F
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