Sonoma State Historic Park Weather Forecast

    • 56
    • 94

    Increasing Clouds

    • 57
    • 82

    Chance Rain Showers

    • 56
    • 81

    Slight Chance Rain Showers

    • 55
    • 83

    Mostly Sunny

    • 57
    • 88

    Sunny

    • 58
    • 92

    Mostly Sunny

    • 57
    • 81

    Chance Rain Showers

Today 17 Sep North Bay Interior Valleys

Sunny. Highs in the lower 80s to mid 90s. Southwest Winds up to 5 Mph increasing to 10 to 15 Mph in the afternoon.

Tonight 17 Sep North Bay Interior Valleys

Partly cloudy in the evening then becoming mostly cloudy. Lows in the 50s to mid 60s. Southwest Winds 5 to 15 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Sonoma State Historic Park Temperature Statistics

September Temperature

Petaluma Municipal Airport (8.1 miles)

  • Lowest 14 September, 2025

    48.2 °F

  • Average September

    62.9 °F

  • Highest 1 September, 2025

    93.2 °F

Climate (2020–Present)

Petaluma Municipal Airport (8.1 miles)

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  • Average Low 2020–2025

    44.4 °F

  • Average 2020–2025

    55.2 °F

  • Average High 2020–2025

    69.1 °F
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