Harry A. Merlo State Recreation Area Weather Forecast

    • 34
    • 48

    Increasing Clouds

    • 37
    • 52

    Partly Sunny

    • 39
    • 55

    Mostly Sunny

    • 40
    • 56

    Mostly Sunny

    • 42
    • 55

    Partly Sunny

    • 41
    • 53

    Rain Likely

Today 27 Dec Northern Humboldt Coast

Mostly sunny. Patchy frost in the morning. Slight chance of rain Showers in the morning. Highs 45 to 55. North wind 10 to 20 Mph.

Tonight 27 Dec Northern Humboldt Coast

Partly cloudy in the evening then becoming mostly cloudy. Areas of frost. Lows 32 to 42. North wind around 10 Mph.

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Harry A. Merlo State Recreation Area Temperature Statistics

December Temperature

Arcata / Eureka, Arcata Airport (14.3 miles)

  • Lowest 1 December, 2025

    37 °F

  • Average December

    49.5 °F

  • Highest 16 December, 2025

    61 °F

Climate (2020–Present)

Arcata / Eureka, Arcata Airport (14.3 miles)

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  • Average Low 2020–2025

    45.5 °F

  • Average 2020–2025

    52.2 °F

  • Average High 2020–2025

    59.3 °F
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