Arcata Bay Weather Forecast

    • 52
    • 59

    Mostly Cloudy

    • 55
    • 62

    Partly Sunny

    • 59
    • 65

    Mostly Cloudy

    • 61
    • 67

    Mostly Cloudy

    • 59
    • 66

    Slight Chance Rain

    • 57
    • 62

    Slight Chance Rain

Today 6 Sep Northern Coastal Humboldt

Mostly cloudy in the morning then becoming mostly sunny. Patchy fog in the morning. Highs 59 to 69. Northeast wind around 5 Mph shifting to the northwest in the afternoon.

Tonight 6 Sep Northern Coastal Humboldt

Mostly cloudy. Lows 46 to 56. North wind around 10 Mph shifting to the northeast overnight.

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Arcata Bay Temperature Statistics

September Temperature

Arcata / Eureka, Arcata Airport (9.3 miles)

  • Lowest 1 September, 2026

    52.6 °F

  • Average September

    59.9 °F

  • Highest 1 September, 2026

    70.6 °F

Climate (2021–2026)

Arcata / Eureka, Arcata Airport (9.3 miles)

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  • Average Low 2021–2026

    45.8 °F

  • Average 2021–2026

    52.6 °F

  • Average High 2021–2026

    59.7 °F
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