St Helena Weather Forecast

    • 42
    • 62

    Increasing Clouds

    • 43
    • 64

    Partly Sunny

    • 43
    • 62

    Partly Sunny

    • 43
    • 63

    Mostly Sunny

    • 44
    • 64

    Mostly Sunny

    • 44
    • 62

    Mostly Sunny

Today 28 Nov North Bay Interior Valleys

Partly cloudy in the morning then becoming sunny. Patchy fog in the morning. Highs in the 50s to mid 60s. North Winds up to 5 Mph. Becoming south in the afternoon.

Tonight 28 Nov North Bay Interior Valleys

Mostly cloudy. Patchy fog. Lows in the 40s. North Winds up to 5 Mph in the evening. Becoming light.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

St Helena Temperature Statistics

November Temperature

Petaluma Municipal Airport (18 miles)

  • Lowest 22 November, 2025

    37.4 °F

  • Average November

    56 °F

  • Highest 10 November, 2025

    77 °F

Climate (2020–Present)

Petaluma Municipal Airport (18 miles)

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  • Average Low 2020–2025

    44.6 °F

  • Average 2020–2025

    55.1 °F

  • Average High 2020–2025

    68.7 °F
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