Big Flat Weather Forecast

    • 56
    • 59

    Increasing Clouds

    • 58
    • 65

    Mostly Cloudy

    • 56
    • 63

    Partly Sunny

    • 56
    • 64

    Partly Sunny

    • 56
    • 63

    Partly Sunny

    • 58
    • 65

    Mostly Sunny

    • 58
    • 69

    Mostly Sunny

Today 17 Aug Southwestern Humboldt

Mostly cloudy in the morning then clearing. Highs 70 to 85. Northwest wind around 10 Mph.

Tonight 17 Aug Southwestern Humboldt

Partly cloudy. Patchy smoke. Lows 52 to 62. North wind up to 10 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Big Flat Temperature Statistics

August Temperature

Fortuna Rohnerville Airport (29.2 miles)

  • Lowest 3 August, 2026

    48.2 °F

  • Average August

    57.4 °F

  • Highest 1 August, 2026

    71.6 °F

Climate (2021–2026)

Fortuna Rohnerville Airport (29.2 miles)

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  • Average Low 2021–2026

    45.3 °F

  • Average 2021–2026

    51.4 °F

  • Average High 2021–2026

    59.7 °F
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