Millersylvania State Park Weather Forecast

    • 50
    • 70

    Partly Sunny

    • 51
    • 76

    Becoming Sunny

    • 55
    • 81

    Partly Sunny

    • 49
    • 72

    Partly Sunny

    • 49
    • 69

    Slight Chance Rain

    • 49
    • 70

    Chance Rain

    • 50
    • 73

    Mostly Sunny

Today 7 Sep Lowlands of Lewis and Southern Thurston Counties

Mostly cloudy. Highs near 70. South wind to 10 Mph in the morning becoming light.

Tonight 7 Sep Lowlands of Lewis and Southern Thurston Counties

Mostly clear. Lows near 50. Light wind.

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Millersylvania State Park Temperature Statistics

September Temperature

Olympia, Olympia Airport (3.7 miles)

  • Lowest 5 September, 2026

    46 °F

  • Average September

    59.1 °F

  • Highest 5 September, 2026

    71.1 °F

Climate (2021–2026)

Olympia, Olympia Airport (3.7 miles)

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  • Average Low 2021–2026

    41.7 °F

  • Average 2021–2026

    51.9 °F

  • Average High 2021–2026

    62.2 °F
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