Petaluma River - Petaluma Weather Forecast

    • 51
    • 76

    Areas Fog

    • 52
    • 80

    Partly Sunny

    • 54
    • 87

    Mostly Sunny

    • 56
    • 85

    Partly Sunny

    • 51
    • 80

    Partly Sunny

    • 50
    • 78

    Partly Sunny

Today 21 Sep North Bay Interior Valleys

Mostly cloudy in the morning then becoming sunny. Patchy fog in the morning. Highs in the mid 60s to lower 80s. Southwest Winds 5 to 10 Mph increasing to 10 to 20 Mph in the afternoon.

Tonight 21 Sep North Bay Interior Valleys

Partly cloudy in the evening then becoming mostly cloudy. Patchy fog in the evening. Areas of fog after midnight. Lows in the 40s to upper 50s. Southwest Winds 5 to 15 Mph.

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Petaluma River - Petaluma Temperature Statistics

September Temperature

Petaluma Municipal Airport (1.9 miles)

  • Lowest 7 September, 2026

    44.6 °F

  • Average September

    64.7 °F

  • Highest 9 September, 2026

    96.8 °F

Climate (2021–2026)

Petaluma Municipal Airport (1.9 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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