Bothe-Napa Valley State Park Weather Forecast

    • 58
    • 86

    Chance Rain Showers

    • 57
    • 79

    Partly Sunny

    • 58
    • 82

    Mostly Sunny

    • 61
    • 87

    Sunny

    • 61
    • 92

    Mostly Sunny

    • 58
    • 83

    Chance Rain Showers

Today 18 Sep North Bay Interior Valleys

Mostly cloudy. A slight chance of Showers. Isolated Thunderstorms in the afternoon. Highs in the upper 60s to mid 80s. South Winds 10 to 15 Mph.

Tonight 18 Sep North Bay Interior Valleys

Mostly cloudy. A slight chance of Showers in the evening. Isolated Thunderstorms. A chance of Showers after midnight. Patchy fog after midnight. Lows in the mid 50s to lower 60s. Southwest Winds 5 to 10 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Bothe-Napa Valley State Park Temperature Statistics

September Temperature

Santa Rosa, Santa Rosa Sonoma County Airport (15.5 miles)

  • Lowest 14 September, 2025

    48 °F

  • Average September

    65.7 °F

  • Highest 1 September, 2025

    99 °F

Climate (2020–Present)

Santa Rosa, Santa Rosa Sonoma County Airport (15.5 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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