Tomales Bay - Brazil Beach Weather Forecast

    • 54
    • 60

    Mostly Cloudy

    • 54
    • 60

    Mostly Cloudy

    • 54
    • 62

    Partly Sunny

    • 56
    • 64

    Partly Sunny

    • 56
    • 64

    Mostly Cloudy

    • 54
    • 62

    Partly Sunny

Today 20 Sep Coastal North Bay Including Point Reyes National Seashore

Mostly cloudy. Highs in the 60s to lower 70s. West Winds 5 to 10 Mph.

Tonight 20 Sep Coastal North Bay Including Point Reyes National Seashore

Mostly cloudy. Patchy fog. Lows in the mid 50s. West Winds 5 to 10 Mph.

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Tomales Bay - Brazil Beach Temperature Statistics

September Temperature

Petaluma Municipal Airport (18.6 miles)

  • Lowest 7 September, 2026

    44.6 °F

  • Average September

    65 °F

  • Highest 9 September, 2026

    96.8 °F

Climate (2021–2026)

Petaluma Municipal Airport (18.6 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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