Alton Weather Forecast

    • 42
    • 59

    Cloudy

    • 44
    • 63

    Mostly Cloudy

    • 45
    • 66

    Areas Fog

    • 42
    • 59

    Mostly Cloudy

    • 41
    • 59

    Partly Sunny

    • 43
    • 62

    Chance Rain

Today 19 Oct Northern Coastal Humboldt

Cloudy. Patchy fog in the morning. Highs 54 to 64. Southeast wind around 5 Mph shifting to the southwest in the afternoon.

Tonight 19 Oct Northern Coastal Humboldt

Mostly cloudy. Patchy fog. Lows 38 to 48. Northeast wind around 10 Mph.

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Alton Temperature Statistics

October Temperature

Fortuna Rohnerville Airport (0.6 miles)

  • Lowest 12 October, 2026

    35.6 °F

  • Average October

    53.8 °F

  • Highest 15 October, 2026

    82.4 °F

Climate (2021–2026)

Fortuna Rohnerville Airport (0.6 miles)

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  • Average Low 2021–2026

    45.4 °F

  • Average 2021–2026

    51.5 °F

  • Average High 2021–2026

    59.8 °F
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