Mad River Beach Weather Forecast

    • 49
    • 62

    Partly Sunny

    • 52
    • 63

    Partly Sunny

    • 54
    • 66

    Partly Sunny

    • 54
    • 65

    Mostly Cloudy

    • 54
    • 64

    Mostly Cloudy

    • 55
    • 66

    Partly Sunny

Today 28 Sep Northern Coastal Humboldt

Mostly cloudy early in the morning then becoming partly cloudy. Patchy fog in the morning. Highs 60 to 70. Northeast wind around 5 Mph shifting to the northwest in the afternoon.

Tonight 28 Sep Northern Coastal Humboldt

Partly cloudy. Lows 43 to 53. North wind around 10 Mph.

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Mad River Beach Temperature Statistics

September Temperature

Arcata / Eureka, Arcata Airport (3.1 miles)

  • Lowest 24 September, 2026

    44.7 °F

  • Average September

    58.2 °F

  • Highest 9 September, 2026

    75.7 °F

Climate (2021–2026)

Arcata / Eureka, Arcata Airport (3.1 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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