Fullerton Weather Forecast

    • 66
    • 91

    Mostly Sunny

    • 57
    • 85

    Becoming Sunny

    • 60
    • 85

    Partly Sunny

    • 64
    • 90

    Partly Sunny

    • 65
    • 87

    Thunderstorms

    • 63
    • 84

    Rain Showers

    • 63
    • 85

    Partly Sunny

Today 20 Oct Williamson

Mostly sunny. Highs in the lower 90s. South Winds 15 to 20 Mph with Gusts up to 30 Mph.

Tonight 20 Oct Williamson

Clear this Evening, then becoming partly cloudy. Not as cool with Lows in the mid 60s. Southwest Winds 5 to 10 Mph with Gusts up to 20 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Fullerton Temperature Statistics

October Temperature

Austin Executive Airport (8.1 miles)

  • Lowest 16 October, 2025

    60.8 °F

  • Average October

    78.6 °F

  • Highest 1 October, 2025

    95 °F

Climate (2020–Present)

Austin Executive Airport (8.1 miles)

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  • Average Low 2020–2025

    59.2 °F

  • Average 2020–2025

    69.1 °F

  • Average High 2020–2025

    80 °F
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