Alton Weather Forecast

    • 50
    • 61

    Rain

    • 51
    • 61

    Rain

    • 45
    • 59

    Rain

    • 42
    • 59

    Slight Chance Rain

    • 43
    • 62

    Slight Chance Rain

    • 44
    • 62

    Mostly Cloudy

Today 22 Feb Northern Humboldt Coast

Rain, breezy. Highs 55 to 65. South wind 15 to 25 Mph with Gusts to around 40 Mph.

Tonight 22 Feb Northern Humboldt Coast

Mostly cloudy. Rain in the Evening, then chance of rain overnight. Lows 45 to 55. Southeast wind 5 to 15 Mph.

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Alton Temperature Statistics

February Temperature

Fortuna Rohnerville Airport (0.6 miles)

  • Lowest 17 February, 2026

    32 °F

  • Average February

    46.9 °F

  • Highest 4 February, 2026

    68 °F

Climate (2021–Present)

Fortuna Rohnerville Airport (0.6 miles)

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  • Average Low 2021–2026

    45.1 °F

  • Average 2021–2026

    51.2 °F

  • Average High 2021–2026

    59.6 °F
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