Sonoma Weather Forecast

    • 51
    • 88

    Mostly Sunny

    • 50
    • 83

    Mostly Sunny

    • 51
    • 78

    Partly Sunny

    • 51
    • 79

    Mostly Sunny

    • 52
    • 84

    Mostly Sunny

    • 51
    • 86

    Partly Sunny

    • 52
    • 83

    Mostly Sunny

Today 14 Sep North Bay Interior Valleys

Sunny. Highs in the mid 70s to lower 90s. Southwest Winds 5 to 15 Mph.

Tonight 14 Sep North Bay Interior Valleys

Mostly clear except patchy fog after midnight. Lows in the 50s. West Winds 10 to 15 Mph. Becoming southwest up to 5 Mph after midnight.

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Sonoma Temperature Statistics

September Temperature

Petaluma Municipal Airport (8.1 miles)

  • Lowest 7 September, 2026

    44.6 °F

  • Average September

    66.3 °F

  • Highest 9 September, 2026

    96.8 °F

Climate (2021–2026)

Petaluma Municipal Airport (8.1 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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