St Helena Weather Forecast

    • 51
    • 84

    Mostly Sunny

    • 54
    • 88

    Mostly Sunny

    • 55
    • 90

    Mostly Sunny

    • 56
    • 89

    Mostly Sunny

    • 56
    • 90

    Mostly Sunny

    • 54
    • 91

    Mostly Sunny

Today 24 Jun North Bay Interior Valleys

Partly cloudy in the morning then becoming sunny. Patchy fog in the morning. Highs in the upper 60s to lower 80s. Southwest Winds 5 to 15 Mph.

Tonight 24 Jun North Bay Interior Valleys

Partly cloudy. Patchy fog. Lows near 50. Southwest Winds 5 to 10 Mph.

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St Helena Temperature Statistics

June Temperature

Petaluma Municipal Airport (18 miles)

  • Lowest 14 June, 2025

    41 °F

  • Average June

    56.9 °F

  • Highest 18 June, 2025

    84.2 °F

Climate (2020–Present)

Petaluma Municipal Airport (18 miles)

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  • Average Low 2020–2025

    44.6 °F

  • Average 2020–2025

    55.4 °F

  • Average High 2020–2025

    69.3 °F
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