Merrill Lake Weather Forecast

    • 41
    • 46

    Rain Showers

    • 40
    • 46

    Rain Showers

    • 42
    • 54

    Mostly Cloudy

    • 43
    • 59

    Partly Sunny

    • 46
    • 61

    Partly Sunny

    • 48
    • 63

    Partly Sunny

Today 15 May South Washington Cascades

Mostly cloudy with a chance of rain Showers. A chance of snow Showers with a slight chance of Thunderstorms this afternoon. Snow may be heavy at Times this afternoon. Snow level 3500 feet. Little or no snow accumulation. West wind 10 to 15 Mph. Gusts up to 35 Mph this afternoon. Chance of precipitation 50 percent. Rainfall Amounts a tenth to a half of an inch.

Tonight 15 May South Washington Cascades

Rain Showers, snow Showers with a slight chance of Thunderstorms in the Evening, then rain and snow Showers after midnight. Snow may be heavy at Times in the evening. Snow level 3500 feet. Snow accumulation of 1 to 3 Inches. West wind 10 to 15 Mph with Gusts up to 40 Mph. Chance of precipitation near 100 percent. Rainfall Amounts a quarter to a half of an inch.

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Merrill Lake Temperature Statistics

May Temperature

Southwest Washington Regional Airport (26.7 miles)

  • Lowest 9 May, 2026

    44.1 °F

  • Average May

    61.5 °F

  • Highest 3 May, 2026

    91 °F

Climate (2021–Present)

Southwest Washington Regional Airport (26.7 miles)

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  • Average Low 2021–2026

    45.2 °F

  • Average 2021–2026

    53.1 °F

  • Average High 2021–2026

    62.5 °F
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