Tomales Bay State Park Weather Forecast

    • 45
    • 60

    Decreasing Clouds

    • 46
    • 61

    Mostly Sunny

    • 46
    • 61

    Mostly Sunny

    • 45
    • 61

    Mostly Sunny

    • 47
    • 59

    Areas Fog

    • 47
    • 58

    Mostly Cloudy

Today 9 Dec Coastal North Bay Including Point Reyes National Seashore

Partly cloudy in the morning then becoming sunny. Areas of fog in the morning. Highs around 60. North Winds around 5 Mph. Becoming northwest in the afternoon.

Tonight 9 Dec Coastal North Bay Including Point Reyes National Seashore

Mostly clear. Lows in the upper 40s. North Winds around 5 Mph in the evening. Becoming light.

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Tomales Bay State Park Temperature Statistics

December Temperature

Petaluma Municipal Airport (18 miles)

  • Lowest 4 December, 2025

    33.8 °F

  • Average December

    44.7 °F

  • Highest 3 December, 2025

    66.2 °F

Climate (2020–Present)

Petaluma Municipal Airport (18 miles)

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  • Average Low 2020–2025

    44.6 °F

  • Average 2020–2025

    55.1 °F

  • Average High 2020–2025

    68.7 °F
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