Alton Weather Forecast

    • 41
    • 55

    Rain Likely

    • 42
    • 54

    Rain

    • 45
    • 56

    Rain

    • 43
    • 52

    Rain

    • 36
    • 51

    Rain Likely

    • 36
    • 53

    Mostly Cloudy

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    Mostly Cloudy

Today 22 Dec Northern Humboldt Coast

Mostly cloudy. Chance of rain Showers in the Morning, then slight chance of rain Showers in the afternoon. Highs 49 to 59. South wind up to 10 Mph.

Tonight 22 Dec Northern Humboldt Coast

Mostly cloudy. Chance of rain overnight. Lows 37 to 47. Southeast wind around 5 Mph.

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Alton Temperature Statistics

December Temperature

Fortuna Rohnerville Airport (0.6 miles)

  • Lowest 3 December, 2025

    37.4 °F

  • Average December

    49.5 °F

  • Highest 9 December, 2025

    62.6 °F

Climate (2020–Present)

Fortuna Rohnerville Airport (0.6 miles)

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  • Average Low 2020–2025

    45.1 °F

  • Average 2020–2025

    51.2 °F

  • Average High 2020–2025

    59.5 °F
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