Tomales Bay Weather Forecast

    • 57
    • 70

    Increasing Clouds

    • 57
    • 61

    Slight Chance Thunderstorms

    • 55
    • 59

    Partly Sunny

    • 55
    • 60

    Partly Sunny

    • 56
    • 60

    Partly Sunny

    • 55
    • 60

    Slight Chance Thunderstorms

Today 23 Sep Coastal North Bay Including Point Reyes National Seashore

Sunny. Highs in the 70s to mid 80s. Southeast Winds around 5 Mph. Becoming west in the afternoon.

Tonight 23 Sep Coastal North Bay Including Point Reyes National Seashore

Mostly clear in the evening then becoming partly cloudy. A slight chance of Showers after midnight. Lows in the upper 50s. West Winds around 5 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Tomales Bay Temperature Statistics

September Temperature

Petaluma Municipal Airport (17.4 miles)

  • Lowest 14 September, 2025

    48.2 °F

  • Average September

    63.3 °F

  • Highest 1 September, 2025

    93.2 °F

Climate (2020–Present)

Petaluma Municipal Airport (17.4 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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