Lake Merwin Weather Forecast

    • 50
    • 70

    Mostly Sunny

    • 56
    • 77

    Partly Sunny

    • 51
    • 78

    Mostly Sunny

    • 49
    • 67

    Mostly Sunny

    • 55
    • 76

    Mostly Sunny

    • 60
    • 85

    Mostly Sunny

    • 57
    • 84

    Mostly Sunny

Today 17 Jun South Washington Cascade Foothills

Mostly sunny. Highs in the mid 70s. Northwest wind 5 to 10 Mph.

Tonight 17 Jun South Washington Cascade Foothills

Mostly clear in the Evening, then becoming partly cloudy. Lows in the upper 40s. Northwest wind 5 to 10 Mph, becoming light after midnight.

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Lake Merwin Temperature Statistics

June Temperature

Southwest Washington Regional Airport (22.4 miles)

  • Lowest 1 June, 2026

    44.1 °F

  • Average June

    62.5 °F

  • Highest 14 June, 2026

    93 °F

Climate (2021–2026)

Southwest Washington Regional Airport (22.4 miles)

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  • Average Low 2021–2026

    45.2 °F

  • Average 2021–2026

    53.1 °F

  • Average High 2021–2026

    62.6 °F
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