Jack London State Historic Park Weather Forecast

    • 53
    • 87

    Mostly Sunny

    • 52
    • 80

    Mostly Cloudy

    • 52
    • 81

    Partly Sunny

    • 53
    • 82

    Mostly Sunny

    • 60
    • 90

    Mostly Sunny

    • 58
    • 93

    Mostly Sunny

    • 55
    • 86

    Partly Sunny

Today 19 Sep North Bay Interior Valleys

Partly cloudy. Highs in the upper 60s to lower 80s.

Tonight 19 Sep North Bay Interior Valleys

Partly cloudy in the evening then becoming mostly cloudy. Patchy fog after midnight. Lows in the 50s to lower 60s. Southwest 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 7 September, 2026

    44.6 °F

  • Average September

    65.2 °F

  • Highest 9 September, 2026

    96.8 °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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