Merlo Lake Weather Forecast

    • 53
    • 85

    Becoming Sunny

    • 54
    • 88

    Mostly Sunny

    • 54
    • 88

    Partly Sunny

    • 53
    • 85

    Partly Sunny

    • 55
    • 86

    Partly Sunny

    • 56
    • 89

    Partly Sunny

Today 21 Aug North Bay Interior Valleys

Mostly cloudy in the morning then becoming partly cloudy. Patchy fog in the morning. Highs in the lower 70s to mid 80s. Southwest Winds 10 to 20 Mph.

Tonight 21 Aug North Bay Interior Valleys

Mostly clear in the evening then becoming partly cloudy. Patchy fog after midnight. Lows in the 40s to upper 50s. Southwest Winds 10 to 20 Mph. Becoming west 5 to 10 Mph after midnight.

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Merlo Lake Temperature Statistics

August Temperature

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

  • Lowest 10 August, 2026

    49.6 °F

  • Average August

    68.8 °F

  • Highest 1 August, 2026

    98.7 °F

Climate (2021–2026)

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

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  • Average Low 2021–2026

    45.9 °F

  • Average 2021–2026

    58.6 °F

  • Average High 2021–2026

    72.8 °F
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