Sonoma Mountain Weather Forecast

    • 45
    • 55

    Decreasing Clouds

    • 47
    • 58

    Partly Sunny

    • 48
    • 59

    Mostly Cloudy

    • 49
    • 59

    Mostly Cloudy

    • 48
    • 55

    Chance Rain

    • 47
    • 56

    Partly Sunny

Today 28 Jan North Bay Interior Valleys

Mostly cloudy in the morning then becoming partly cloudy. Patchy fog in the morning. Highs in the mid 50s to lower 60s. Northeast Winds 5 to 10 Mph. Becoming northwest in the afternoon.

Tonight 28 Jan North Bay Interior Valleys

Mostly clear in the evening then becoming mostly cloudy. Patchy fog. Lows in the 30s to upper 40s. North Winds up to 5 Mph.

Graph Plots Open in Graphs

  • 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

    50.1 °F

  • Highest 24 January, 2026

    69.8 °F

Climate (2021–Present)

Petaluma Municipal Airport (4.3 miles)

Take a look at our website widgetsAvailable free! Find Out More

  • Average Low 2021–2026

    44.6 °F

  • Average 2021–2026

    55.1 °F

  • Average High 2021–2026

    68.5 °F
Get WillyWeather+ to remove ads