St Helena Weather Forecast

    • 38
    • 61

    Sunny

    • 43
    • 64

    Sunny

    • 45
    • 65

    Sunny

    • 45
    • 66

    Sunny

    • 44
    • 66

    Sunny

    • 44
    • 65

    Mostly Sunny

    • 44
    • 66

    Partly Sunny

Today 12 Jan North Bay Interior Valleys

Sunny. Highs in the 50s to mid 60s. Southeast Winds 5 to 10 Mph.

Tonight 12 Jan North Bay Interior Valleys

Clear except for dense fog after midnight. Lows in the lower 30s to mid 40s. Northeast Winds 5 to 10 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

St Helena Temperature Statistics

January Temperature

Petaluma Municipal Airport (18 miles)

  • Lowest 9 January, 2026

    30.2 °F

  • Average January

    49.7 °F

  • Highest 3 January, 2026

    60.8 °F

Climate (2021–Present)

Petaluma Municipal Airport (18 miles)

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  • Average Low 2021–2026

    44.6 °F

  • Average 2021–2026

    55.1 °F

  • Average High 2021–2026

    68.6 °F
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