Graton Weather Forecast

    • 50
    • 77

    Areas Fog

    • 51
    • 82

    Mostly Sunny

    • 53
    • 89

    Mostly Sunny

    • 55
    • 88

    Partly Sunny

    • 50
    • 83

    Partly Sunny

    • 49
    • 80

    Partly Sunny

Today 21 Sep North Bay Interior Valleys

Mostly cloudy in the morning then becoming sunny. Patchy fog in the morning. Highs in the mid 60s to lower 80s. Southwest Winds 5 to 10 Mph increasing to 10 to 20 Mph in the afternoon.

Tonight 21 Sep North Bay Interior Valleys

Partly cloudy in the evening then becoming mostly cloudy. Patchy fog in the evening. Areas of fog after midnight. Lows in the 40s to upper 50s. Southwest Winds 5 to 15 Mph.

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Graton Temperature Statistics

September Temperature

Santa Rosa, Santa Rosa Sonoma County Airport (5 miles)

  • Lowest 5 September, 2026

    46.7 °F

  • Average September

    67.1 °F

  • Highest 10 September, 2026

    101.6 °F

Climate (2021–2026)

Santa Rosa, Santa Rosa Sonoma County Airport (5 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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