Merrill Lake Weather Forecast

    • 52
    • 65

    Mostly Cloudy

    • 55
    • 71

    Partly Sunny

    • 58
    • 76

    Mostly Sunny

    • 57
    • 79

    Sunny

    • 55
    • 76

    Mostly Sunny

    • 53
    • 72

    Mostly Sunny

Today 20 Jul South Washington Cascades

Mostly cloudy. Free air freezing level 13000 Feet, decreasing to free air freezing level 12000 feet in the afternoon. West wind 5 to 10 Mph.

Tonight 20 Jul South Washington Cascades

Mostly cloudy. A slight chance of rain Showers after midnight. Snow level above 8000 feet. Northwest wind 5 to 10 Mph. Chance of rain 20 percent.

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Merrill Lake Temperature Statistics

July Temperature

Southwest Washington Regional Airport (26.7 miles)

  • Lowest 5 July, 2025

    48 °F

  • Average July

    67.8 °F

  • Highest 13 July, 2025

    95 °F

Climate (2020–Present)

Southwest Washington Regional Airport (26.7 miles)

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  • Average Low 2020–2025

    45 °F

  • Average 2020–2025

    52.8 °F

  • Average High 2020–2025

    62.3 °F
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