Las Posadas State Forest Weather Forecast

    • 64
    • 88

    Sunny

    • 62
    • 90

    Increasing Clouds

    • 59
    • 82

    Mostly Cloudy

    • 58
    • 76

    Slight Chance Rain Showers

    • 59
    • 80

    Mostly Sunny

    • 63
    • 85

    Sunny

    • 62
    • 87

    Partly Sunny

Today 16 Sep North Bay Interior Mountains

Sunny. Highs in the 80s to lower 90s. Southwest Winds around 5 Mph.

Tonight 16 Sep North Bay Interior Mountains

Clear. Lows in the upper 60s. Light Winds. Becoming northwest around 5 Mph after midnight.

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Las Posadas State Forest Temperature Statistics

September Temperature

Santa Rosa, Santa Rosa Sonoma County Airport (22.4 miles)

  • Lowest 14 September, 2025

    48 °F

  • Average September

    65.3 °F

  • Highest 1 September, 2025

    99 °F

Climate (2020–Present)

Santa Rosa, Santa Rosa Sonoma County Airport (22.4 miles)

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  • Average Low 2020–2025

    45.3 °F

  • Average 2020–2025

    57.9 °F

  • Average High 2020–2025

    72.8 °F
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