Guernewood Park Weather Forecast

    • 56
    • 85

    Mostly Sunny

    • 53
    • 77

    Becoming Sunny

    • 52
    • 77

    Sunny

    • 51
    • 82

    Mostly Sunny

    • 52
    • 77

    Mostly Sunny

    • 52
    • 73

    Areas Fog

    • 52
    • 73

    Patchy Fog

Today 11 Sep North Bay Interior Valleys

Sunny. Highs in the mid 70s to upper 80s. Southwest Winds 10 to 20 Mph.

Tonight 11 Sep North Bay Interior Valleys

Mostly clear. Lows in the 50s. Southwest Winds 10 to 20 Mph.

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Guernewood Park Temperature Statistics

September Temperature

Santa Rosa, Santa Rosa Sonoma County Airport (9.9 miles)

  • Lowest 5 September, 2026

    46.7 °F

  • Average September

    67.4 °F

  • Highest 8 September, 2026

    98.7 °F

Climate (2021–2026)

Santa Rosa, Santa Rosa Sonoma County Airport (9.9 miles)

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  • Average Low 2021–2026

    45.9 °F

  • Average 2021–2026

    58.7 °F

  • Average High 2021–2026

    72.8 °F
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