Lake Merwin Weather Forecast

    • 50
    • 60

    Rain Likely

    • 50
    • 57

    Rain Likely

    • 38
    • 55

    Rain

    • 34
    • 48

    Chance Rain

    • 35
    • 52

    Partly Sunny

    • 41
    • 54

    Rain Likely

Today 18 Mar South Washington Cascade Foothills

Mostly cloudy with a 50 percent chance of rain. Highs in the mid 60s. Winds light. Rainfall Amounts less than a tenth of an inch.

Tonight 18 Mar South Washington Cascade Foothills

Mostly cloudy with a 50 percent chance of rain. Lows in the upper 40s. Winds light. Rainfall Amounts less than a tenth of an inch.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Lake Merwin Temperature Statistics

March Temperature

Southwest Washington Regional Airport (22.4 miles)

  • Lowest 10 March, 2026

    32 °F

  • Average March

    46 °F

  • Highest 1 March, 2026

    62.1 °F

Climate (2021–Present)

Southwest Washington Regional Airport (22.4 miles)

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  • Average Low 2021–2026

    45.1 °F

  • Average 2021–2026

    53 °F

  • Average High 2021–2026

    62.5 °F
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