Merlo Lake Weather Forecast

    • 49
    • 54

    Rain

    • 45
    • 54

    Rain

    • 46
    • 51

    Rain Showers

    • 44
    • 48

    Rain

    • 38
    • 50

    Rain Likely

    • 38
    • 52

    Patchy Fog

    • 38
    • 54

    Mostly Cloudy

Today 22 Dec North Bay Interior Valleys

Areas of fog. Rain. Highs in the 50s. Southwest Winds 10 to 20 Mph.

Tonight 22 Dec North Bay Interior Valleys

Areas of fog. Rain. Lows in the upper 40s to mid 50s. North Winds 5 to 10 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Merlo Lake Temperature Statistics

December Temperature

Santa Rosa, Santa Rosa Sonoma County Airport (16.2 miles)

  • Lowest 4 December, 2025

    34 °F

  • Average December

    46.2 °F

  • Highest 3 December, 2025

    68 °F

Climate (2020–Present)

Santa Rosa, Santa Rosa Sonoma County Airport (16.2 miles)

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  • Average Low 2020–2025

    45.5 °F

  • Average 2020–2025

    57.9 °F

  • Average High 2020–2025

    72.5 °F
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