Lake Merwin Weather Forecast

    • 40
    • 53

    Decreasing Clouds

    • 39
    • 50

    Increasing Clouds

    • 48
    • 54

    Mostly Cloudy

    • 44
    • 56

    Mostly Cloudy

    • 47
    • 53

    Rain Likely

    • 45
    • 51

    Rain Likely

    • 45
    • 50

    Rain Likely

Today 31 Oct South Washington Cascade Foothills

Mostly cloudy with a 40 percent chance of rain. Highs in the upper 50s.

Tonight 31 Oct South Washington Cascade Foothills

Mostly cloudy this Evening, then becoming partly cloudy. Patchy fog. Patchy frost after midnight. Lows in the upper 30s. Winds light this Evening, becoming light and variable.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Lake Merwin Temperature Statistics

October Temperature

Southwest Washington Regional Airport (22.4 miles)

  • Lowest 11 October, 2026

    36 °F

  • Average October

    54.5 °F

  • Highest 4 October, 2026

    79 °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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