St Helena Weather Forecast

    • 40
    • 56

    Rain

    • 41
    • 63

    Mostly Sunny

    • 44
    • 68

    Partly Sunny

    • 51
    • 73

    Sunny

    • 57
    • 78

    Sunny

    • 57
    • 83

    Sunny

    • 56
    • 86

    Sunny

Today 4 May North Bay Interior Valleys

Rain. Highs in the 50s to lower 60s. West Winds 10 to 20 Mph.

Tonight 4 May North Bay Interior Valleys

Partly cloudy in the evening then becoming mostly clear. Lows in the 30s to upper 40s. West Winds 10 to 20 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

St Helena Temperature Statistics

May Temperature

Petaluma Municipal Airport (18 miles)

  • Lowest 1 May, 2024

    39.2 °F

  • Average May

    56.8 °F

  • Highest 1 May, 2024

    71.6 °F

Climate (2019–Present)

Petaluma Municipal Airport (18 miles)

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  • Average Low 2019–2024

    45 °F

  • Average 2019–2024

    55.8 °F

  • Average High 2019–2024

    69.8 °F
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