Sonoma Mountain Weather Forecast

    • 54
    • 76

    Partly Cloudy

    • 47
    • 62

    Mostly Sunny

    • 49
    • 63

    Mostly Sunny

    • 50
    • 63

    Mostly Sunny

    • 50
    • 67

    Mostly Sunny

    • 53
    • 71

    Mostly Sunny

    • 59
    • 77

    Sunny

Today 9 Oct North Bay Interior Valleys

Sunny. Highs in the 70s to 80s. Southwest Winds 10 to 20 Mph.

Tonight 9 Oct North Bay Interior Valleys

Mostly clear in the evening then becoming partly cloudy. Lows in the upper 40s to mid 50s. Southwest Winds 10 to 20 Mph.

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Sonoma Mountain Temperature Statistics

October Temperature

Petaluma Municipal Airport (4.3 miles)

  • Lowest 1 October, 2026

    44.6 °F

  • Average October

    69.4 °F

  • Highest 3 October, 2026

    98.6 °F

Climate (2021–2026)

Petaluma Municipal Airport (4.3 miles)

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  • Average Low 2021–2026

    44.7 °F

  • Average 2021–2026

    55.2 °F

  • Average High 2021–2026

    68.5 °F
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