Lake Merwin Weather Forecast

    • 58
    • 75

    Chance Rain Showers

    • 55
    • 83

    Mostly Sunny

    • 52
    • 72

    Partly Sunny

    • 50
    • 71

    Mostly Sunny

    • 47
    • 70

    Partly Sunny

    • 48
    • 68

    Partly Sunny

    • 48
    • 65

    Partly Sunny

Today 2 May South Washington Cascade Foothills

Mostly sunny with a 20 percent chance of Thunderstorms. Highs around 80. Northwest wind 5 to 10 Mph.

Tonight 2 May South Washington Cascade Foothills

Partly cloudy with a chance of Showers with a slight chance of Thunderstorms in the Evening, then mostly clear after midnight. Lows in the mid 50s. Northeast wind 5 to 10 Mph. Chance of rain 30 percent.

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Lake Merwin Temperature Statistics

May Temperature

Southwest Washington Regional Airport (22.4 miles)

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Climate (2021–Present)

Southwest Washington Regional Airport (22.4 miles)

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  • Average Low 2021–2026

    45.2 °F

  • Average 2021–2026

    53 °F

  • Average High 2021–2026

    62.5 °F
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