Lake Ralphine Weather Forecast

    • 54
    • 82

    Mostly Sunny

    • 54
    • 85

    Partly Sunny

    • 53
    • 80

    Mostly Cloudy

    • 53
    • 81

    Partly Sunny

    • 55
    • 84

    Mostly Sunny

    • 58
    • 91

    Mostly Sunny

    • 58
    • 91

    Mostly Sunny

Today 18 Sep North Bay Interior Valleys

Sunny. Highs in the 70s to 80s. Southwest Winds up to 5 Mph increasing to 10 to 20 Mph in the afternoon.

Tonight 18 Sep North Bay Interior Valleys

Mostly clear except patchy fog after midnight. Lows in the 50s to lower 60s. West Winds 5 to 15 Mph.

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Lake Ralphine Temperature Statistics

September Temperature

Santa Rosa, Santa Rosa Sonoma County Airport (8.7 miles)

  • Lowest 5 September, 2026

    46.7 °F

  • Average September

    67.6 °F

  • Highest 10 September, 2026

    101.6 °F

Climate (2021–2026)

Santa Rosa, Santa Rosa Sonoma County Airport (8.7 miles)

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  • Average Low 2021–2026

    45.9 °F

  • Average 2021–2026

    58.7 °F

  • Average High 2021–2026

    72.9 °F
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