Tomales Bay - Marshall Weather Forecast

    • 52
    • 68

    Increasing Clouds

    • 54
    • 73

    Becoming Sunny

    • 58
    • 71

    Mostly Cloudy

    • 51
    • 67

    Partly Sunny

    • 52
    • 62

    Partly Sunny

    • 52
    • 61

    Partly Sunny

    • 53
    • 63

    Mostly Sunny

Today 22 Sep Coastal North Bay Including Point Reyes National Seashore

Sunny. Highs in the 60s to lower 70s. West Winds 10 to 15 Mph.

Tonight 22 Sep Coastal North Bay Including Point Reyes National Seashore

Mostly clear in the evening then becoming partly cloudy. Patchy fog after midnight. Lows in the lower 50s. Northwest Winds 5 to 15 Mph.

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Tomales Bay - Marshall Temperature Statistics

September Temperature

Petaluma Municipal Airport (16.8 miles)

  • Lowest 7 September, 2026

    44.6 °F

  • Average September

    64.4 °F

  • Highest 9 September, 2026

    96.8 °F

Climate (2021–2026)

Petaluma Municipal Airport (16.8 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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