Lake Sylvia State Park Weather Forecast

    • 49
    • 70

    Increasing Clouds

    • 45
    • 57

    Rain

    • 46
    • 64

    Chance Rain Showers

    • 48
    • 71

    Partly Sunny

    • 50
    • 72

    Partly Sunny

    • 44
    • 64

    Partly Sunny

    • 41
    • 63

    Partly Sunny

Today 24 May Middle Chehalis River Valley

Partly sunny. Highs in the 70s. Light wind.

Tonight 24 May Middle Chehalis River Valley

Partly cloudy in the evening then becoming mostly cloudy. Lows in the mid to upper 40s. West wind to 10 Mph becoming southwest after midnight.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Lake Sylvia State Park Temperature Statistics

May Temperature

Hoquiam, Bowerman Airport (15.5 miles)

  • Lowest 17 May, 2026

    38.6 °F

  • Average May

    56.1 °F

  • Highest 3 May, 2026

    82.7 °F

Climate (2021–Present)

Hoquiam, Bowerman Airport (15.5 miles)

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  • Average Low 2021–2026

    46.4 °F

  • Average 2021–2026

    52.4 °F

  • Average High 2021–2026

    58.7 °F
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