Guerneville Weather Forecast

    • 47
    • 70

    Mostly Sunny

    • 49
    • 71

    Mostly Sunny

    • 50
    • 77

    Sunny

    • 53
    • 80

    Mostly Sunny

    • 55
    • 83

    Mostly Sunny

    • 56
    • 86

    Mostly Sunny

    • 55
    • 84

    Partly Sunny

Today 21 Sep North Bay Interior Valleys

Sunny, breezy. Highs in the 60s to 70s. Northwest Winds 20 to 30 Mph.

Tonight 21 Sep North Bay Interior Valleys

Mostly clear. Breezy. Lows in the upper 30s to lower 50s. Northwest Winds 20 to 30 Mph. Becoming west 10 to 20 Mph after midnight.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Guerneville Temperature Statistics

September Temperature

Santa Rosa, Santa Rosa Sonoma County Airport (9.3 miles)

  • Lowest 15 September, 2017

    44.1 °F
  • Average September

    68.7 °F
  • Highest 1 September, 2017

    109 °F

Climate (2010–Present)

Santa Rosa, Santa Rosa Sonoma County Airport (9.3 miles)

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  • Average Low 2010–Present

    46 °F
  • Average 2010–Present

    56.5 °F
  • Average High 2010–Present

    72.1 °F
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