Arcata Bay - Mad River Slough Weather Forecast

    • 54
    • 59

    Mostly Cloudy

    • 54
    • 60

    Rain Likely

    • 52
    • 57

    Chance Rain

    • 52
    • 58

    Mostly Cloudy

    • 51
    • 57

    Partly Sunny

    • 52
    • 58

    Partly Sunny

Today 23 Sep Northern Coastal Humboldt

Mostly cloudy. Patchy drizzle and fog in the morning. Highs 62 to 72. Northwest wind 5 to 15 Mph.

Tonight 23 Sep Northern Coastal Humboldt

Mostly cloudy. Patchy fog. Lows 47 to 57. Northwest wind around 10 Mph shifting to the south overnight.

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Arcata Bay - Mad River Slough Temperature Statistics

September Temperature

Arcata / Eureka, Arcata Airport (8.1 miles)

  • Lowest 5 September, 2026

    46.7 °F

  • Average September

    58.5 °F

  • Highest 9 September, 2026

    75.7 °F

Climate (2021–2026)

Arcata / Eureka, Arcata Airport (8.1 miles)

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  • Average Low 2021–2026

    45.8 °F

  • Average 2021–2026

    52.6 °F

  • Average High 2021–2026

    59.8 °F
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