Sonoma Mountain Weather Forecast

    • 39
    • 51

    Decreasing Clouds

    • 37
    • 48

    Mostly Sunny

    • 38
    • 49

    Mostly Sunny

    • 40
    • 50

    Mostly Cloudy

    • 42
    • 52

    Partly Sunny

    • 44
    • 55

    Mostly Sunny

Today 7 Jan North Bay Interior Valleys

Mostly cloudy in the morning then becoming sunny. Highs in the 50s. Northwest Winds 5 to 15 Mph. Gusts up to 30 Mph in the afternoon.

Tonight 7 Jan North Bay Interior Valleys

Partly cloudy in the evening then becoming mostly clear. Lows in the 30s to mid 40s. Northwest Winds 10 to 20 Mph.

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Sonoma Mountain Temperature Statistics

January Temperature

Petaluma Municipal Airport (4.3 miles)

  • Lowest 4 January, 2026

    44.6 °F

  • Average January

    52.4 °F

  • Highest 3 January, 2026

    60.8 °F

Climate (2021–Present)

Petaluma Municipal Airport (4.3 miles)

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  • Average Low 2021–2026

    44.6 °F

  • Average 2021–2026

    55.1 °F

  • Average High 2021–2026

    68.6 °F
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