Arcata Bay Weather Forecast

    • 53
    • 62

    Rain Showers

    • 54
    • 62

    Partly Sunny

    • 54
    • 61

    Partly Sunny

    • 56
    • 64

    Partly Sunny

    • 55
    • 65

    Partly Sunny

    • 55
    • 62

    Mostly Cloudy

Today 13 Sep Northern Coastal Humboldt

Mostly cloudy in the morning then becoming partly cloudy. Patchy fog in the morning. Slight chance of rain in the morning. Highs 63 to 73. Southeast wind around 5 Mph shifting to the northwest in the afternoon.

Tonight 13 Sep Northern Coastal Humboldt

Partly cloudy in the evening then becoming mostly cloudy. Lows 45 to 55. North wind around 15 Mph decreasing to around 5 Mph overnight.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Arcata Bay Temperature Statistics

September Temperature

Arcata / Eureka, Arcata Airport (9.3 miles)

  • Lowest 5 September, 2026

    46.7 °F

  • Average September

    59 °F

  • Highest 9 September, 2026

    75 °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

    59.8 °F
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