Tomales Bay State Park Weather Forecast

    • 56
    • 65

    Mostly Cloudy

    • 57
    • 65

    Chance Rain

    • 55
    • 64

    Chance Rain Showers

    • 54
    • 64

    Slight Chance Rain Showers

    • 54
    • 64

    Partly Sunny

    • 54
    • 64

    Partly Sunny

Today 7 Sep Coastal North Bay Including Point Reyes National Seashore

Partly cloudy. Areas of fog in the morning. Highs in the mid 60s to lower 70s. Southwest Winds 5 to 10 Mph.

Tonight 7 Sep Coastal North Bay Including Point Reyes National Seashore

Mostly cloudy. Patchy fog after midnight. A chance of rain after midnight. Lows in the mid 50s. West Winds around 5 Mph in the evening. Becoming light.

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Tomales Bay State Park Temperature Statistics

September Temperature

Petaluma Municipal Airport (18 miles)

  • Lowest 1 September, 2025

    51.8 °F

  • Average September

    63.3 °F

  • Highest 1 September, 2025

    93.2 °F

Climate (2020–Present)

Petaluma Municipal Airport (18 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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