Alton Weather Forecast

    • 53
    • 62

    Rain

    • 50
    • 62

    Rain

    • 45
    • 58

    Rain

    • 52
    • 59

    Rain

    • 44
    • 58

    Rain

    • 42
    • 56

    Rain Likely

Today 15 Dec Northern Humboldt Coast

Rain Showers in the morning. Slight chance of Thunderstorms through the day. Rain in the afternoon. Highs 56 to 66. Southeast wind 5 to 15 Mph.

Tonight 15 Dec Northern Humboldt Coast

Rain likely. Lows 48 to 58. Southeast wind up to 10 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Alton Temperature Statistics

December Temperature

Fortuna Rohnerville Airport (0.6 miles)

  • Lowest 3 December, 2025

    37.4 °F

  • Average December

    48.7 °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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