William O'Brien State Park Weather Forecast

    • 55
    • 82

    Mostly Cloudy

    • 58
    • 81

    Mostly Cloudy

    • 56
    • 83

    Partly Sunny

    • 58
    • 85

    Partly Sunny

    • 61
    • 85

    Rain Showers Likely

    • 61
    • 84

    Rain Showers Likely

Today 30 May Washington

Mostly cloudy. Highs in the lower 80s. Southeast Winds 5 to 15 Mph.

Tonight 30 May Washington

Mostly cloudy. Lows in the mid 50s. Southeast Winds 5 to 15 Mph.

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William O'Brien State Park Temperature Statistics

May Temperature

L O Simenstad Municipal Airport (6.8 miles)

  • Lowest 2 May, 2026

    28.6 °F

  • Average May

    57.2 °F

  • Highest 27 May, 2026

    89.2 °F

Climate (2021–Present)

L O Simenstad Municipal Airport (6.8 miles)

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  • Average Low 2021–2026

    37 °F

  • Average 2021–2026

    47.3 °F

  • Average High 2021–2026

    57 °F
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