Alton Weather Forecast

    • 50
    • 64

    Mostly Cloudy

    • 52
    • 70

    Decreasing Clouds

    • 51
    • 70

    Mostly Cloudy

    • 51
    • 68

    Mostly Cloudy

    • 54
    • 68

    Mostly Cloudy

    • 54
    • 69

    Partly Sunny

    • 54
    • 72

    Partly Sunny

Today 5 Jul Northern Humboldt Coast

Mostly cloudy until early afternoon then becoming partly cloudy. Slight chance of drizzle and patchy fog in the morning. Highs 58 to 69. Northwest wind around 10 Mph.

Tonight 5 Jul Northern Humboldt Coast

Partly cloudy early in the evening then becoming mostly cloudy. Patchy fog overnight. Lows 45 to 55. Northwest wind around 10 Mph.

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Alton Temperature Statistics

July Temperature

Fortuna Rohnerville Airport (0.6 miles)

  • Lowest 1 July, 2025

    50 °F

  • Average July

    52.7 °F

  • Highest 1 July, 2025

    60.8 °F

Climate (2020–Present)

Fortuna Rohnerville Airport (0.6 miles)

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  • Average Low 2020–2025

    45 °F

  • Average 2020–2025

    51.1 °F

  • Average High 2020–2025

    59.5 °F
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