St Helena Weather Forecast

    • 56
    • 93

    Mostly Sunny

    • 53
    • 83

    Mostly Sunny

    • 54
    • 83

    Mostly Sunny

    • 54
    • 76

    Slight Chance Rain

    • 52
    • 76

    Mostly Sunny

    • 55
    • 81

    Sunny

Today 5 Jun North Bay Interior Valleys

Sunny. Highs in the upper 70s to lower 90s. West Winds 5 to 10 Mph increasing to 10 to 20 Mph in the afternoon.

Tonight 5 Jun North Bay Interior Valleys

Mostly clear. Lows in the 50s. West Winds 10 to 20 Mph with Gusts to around 35 Mph.

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St Helena Temperature Statistics

June Temperature

Petaluma Municipal Airport (18 miles)

  • Lowest 1 June, 2026

    44.6 °F

  • Average June

    59.3 °F

  • Highest 1 June, 2026

    84.2 °F

Climate (2021–Present)

Petaluma Municipal Airport (18 miles)

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  • Average Low 2021–2026

    44.8 °F

  • Average 2021–2026

    55.2 °F

  • Average High 2021–2026

    68.5 °F
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