St Helena Weather Forecast

    • 45
    • 75

    Mostly Sunny

    • 42
    • 73

    Partly Sunny

    • 41
    • 70

    Mostly Sunny

    • 42
    • 70

    Partly Sunny

    • 44
    • 70

    Partly Sunny

    • 44
    • 68

    Partly Sunny

Today 24 Oct North Bay Interior Valleys

Sunny. Highs in the 60s to upper 70s. North Winds 5 to 10 Mph. Becoming southwest in the afternoon.

Tonight 24 Oct North Bay Interior Valleys

Mostly clear. Lows in the upper 30s to lower 50s. Southwest Winds up to 5 Mph in the evening. Becoming light.

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St Helena Temperature Statistics

October Temperature

Petaluma Municipal Airport (18 miles)

  • Lowest 13 October, 2026

    39.2 °F

  • Average October

    64.3 °F

  • Highest 3 October, 2026

    98.6 °F

Climate (2021–2026)

Petaluma Municipal Airport (18 miles)

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  • Average Low 2021–2026

    44.7 °F

  • Average 2021–2026

    55.3 °F

  • Average High 2021–2026

    68.6 °F
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