Jack London State Historic Park Weather Forecast

    • 50
    • 77

    Mostly Sunny

    • 50
    • 79

    Mostly Sunny

    • 58
    • 88

    Mostly Sunny

    • 60
    • 91

    Partly Sunny

    • 64
    • 92

    Partly Sunny

    • 60
    • 90

    Partly Sunny

Today 5 Sep North Bay Interior Valleys

Sunny. Highs in the upper 60s to lower 80s. Southwest Winds up to 5 Mph increasing to 10 to 20 Mph in the afternoon.

Tonight 5 Sep North Bay Interior Valleys

Mostly clear in the evening then becoming partly cloudy. Patchy fog after midnight. Lows in the upper 40s to mid 50s. West Winds 5 to 15 Mph.

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Jack London State Historic Park Temperature Statistics

September Temperature

Petaluma Municipal Airport (6.8 miles)

  • Lowest 1 September, 2026

    53.6 °F

  • Average September

    61.3 °F

  • Highest 1 September, 2026

    75.2 °F

Climate (2021–2026)

Petaluma Municipal Airport (6.8 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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