St Helena Weather Forecast

    • 47
    • 71

    Rain Likely

    • 48
    • 60

    Rain

    • 46
    • 61

    Rain

    • 43
    • 65

    Chance Rain

    • 45
    • 72

    Mostly Sunny

    • 47
    • 75

    Mostly Sunny

Today 19 Apr North Bay Interior Valleys

Mostly cloudy in the morning then becoming partly cloudy. Highs in the 60s to lower 70s. Southwest Winds 5 to 15 Mph.

Tonight 19 Apr North Bay Interior Valleys

Mostly cloudy. A chance of rain after midnight. Lows in the 40s to mid 50s. Southwest Winds 10 to 15 Mph. Becoming southeast 5 to 10 Mph after midnight.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

St Helena Temperature Statistics

April Temperature

Petaluma Municipal Airport (18 miles)

  • Lowest 15 April, 2026

    39.2 °F

  • Average April

    56.3 °F

  • Highest 5 April, 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

    68.6 °F
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