Sonoma Mountain Weather Forecast

    • 48
    • 55

    Mostly Cloudy

    • 47
    • 55

    Mostly Cloudy

    • 44
    • 54

    Partly Sunny

    • 43
    • 55

    Mostly Sunny

    • 44
    • 52

    Mostly Cloudy

    • 45
    • 54

    Mostly Cloudy

Today 21 Jan North Bay Interior Valleys

Cloudy. Areas of fog in the morning. Highs in the mid 50s to lower 60s. Northeast Winds up to 5 Mph. Becoming south in the afternoon.

Tonight 21 Jan North Bay Interior Valleys

Mostly cloudy. Patchy dense fog. Lows in the 40s to lower 50s. Light Winds. Becoming northwest up to 5 Mph after midnight.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Sonoma Mountain Temperature Statistics

January Temperature

Petaluma Municipal Airport (4.3 miles)

  • Lowest 9 January, 2026

    30.2 °F

  • Average January

    51.2 °F

  • Highest 16 January, 2026

    64.4 °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

    68.5 °F
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