St Helena Weather Forecast

    • 51
    • 71

    Slight Chance Rain Showers

    • 52
    • 78

    Sunny

    • 53
    • 80

    Sunny

    • 53
    • 81

    Sunny

    • 53
    • 82

    Mostly Sunny

    • 51
    • 80

    Mostly Sunny

Today 3 Oct North Bay Interior Valleys

Sunny. A slight chance of Showers in the morning. Highs in the 60s to 70s. West Winds 10 to 15 Mph.

Tonight 3 Oct North Bay Interior Valleys

Mostly clear. Lows in the 40s to mid 50s. Northwest Winds 5 to 15 Mph.

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St Helena Temperature Statistics

October Temperature

Petaluma Municipal Airport (18 miles)

  • Lowest 1 October, 2025

    59 °F

  • Average October

    61.4 °F

  • Highest 1 October, 2025

    66.2 °F

Climate (2020–Present)

Petaluma Municipal Airport (18 miles)

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  • Average Low 2020–2025

    44.4 °F

  • Average 2020–2025

    55.2 °F

  • Average High 2020–2025

    69 °F
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