Glenbrook Weather Forecast

    • 68
    • 91

    Becoming Sunny

    • 61
    • 86

    Mostly Sunny

    • 49
    • 74

    Mostly Sunny

    • 55
    • 74

    Sunny

    • 57
    • 78

    Mostly Sunny

    • 58
    • 77

    Mostly Sunny

    • 55
    • 75

    Mostly Sunny

Today 10 Sep Southwestern Lake

Partly cloudy. Highs 88 to 100. West wind around 10 Mph.

Tonight 10 Sep Southwestern Lake

Mostly clear. Lows 58 to 68. West wind 5 to 15 Mph.

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Glenbrook Temperature Statistics

September Temperature

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

  • Lowest 5 September, 2026

    46.7 °F

  • Average September

    65.9 °F

  • Highest 8 September, 2026

    98.1 °F

Climate (2021–2026)

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

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  • Average Low 2021–2026

    45.9 °F

  • Average 2021–2026

    58.7 °F

  • Average High 2021–2026

    72.8 °F
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