Petaluma River - Black John Slough Entrance Weather Forecast

    • 54
    • 57

    Rain

    • 50
    • 58

    Rain

    • 49
    • 53

    Rain

    • 46
    • 54

    Rain

    • 48
    • 52

    Rain

    • 44
    • 52

    Rain

    • 41
    • 52

    Rain Likely

Today 20 Dec North Bay Interior Valleys

Patchy fog. Rain. Highs in the mid 50s to lower 60s. Southeast Winds around 5 Mph.

Tonight 20 Dec North Bay Interior Valleys

Rain. Lows in the lower to mid 50s. South Winds 10 to 20 Mph with Gusts to around 35 Mph.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Petaluma River - Black John Slough Entrance Temperature Statistics

December Temperature

Novato / Gnoss Field (1.9 miles)

  • Lowest 2 December, 2025

    37.4 °F

  • Average December

    46.6 °F

  • Highest 3 December, 2025

    71.6 °F

Climate (2020–Present)

Novato / Gnoss Field (1.9 miles)

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

  • Average Low 2020–2025

    46.2 °F

  • Average 2020–2025

    57.4 °F

  • Average High 2020–2025

    72.3 °F
Get WillyWeather+ to remove ads