Glenbrook Weather Forecast

    • 70
    • 87

    Increasing Clouds

    • 65
    • 83

    Chance Rain Showers

    • 64
    • 75

    Chance Rain

    • 65
    • 79

    Mostly Sunny

    • 68
    • 82

    Sunny

    • 67
    • 87

    Mostly Sunny

    • 63
    • 78

    Chance Rain

Today 17 Sep Southern Lake County

Sunny. Highs 87 to 98.

Tonight 17 Sep Southern Lake County

Partly cloudy in the evening then becoming mostly cloudy. Lows 61 to 71.

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  • Temperature Real-Time

Glenbrook Temperature Statistics

September Temperature

Santa Rosa, Santa Rosa Sonoma County Airport (24.2 miles)

  • Lowest 14 September, 2025

    48 °F

  • Average September

    65.7 °F

  • Highest 1 September, 2025

    99 °F

Climate (2020–Present)

Santa Rosa, Santa Rosa Sonoma County Airport (24.2 miles)

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  • Average Low 2020–2025

    45.3 °F

  • Average 2020–2025

    57.9 °F

  • Average High 2020–2025

    72.8 °F
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