Lake Merwin Weather Forecast

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    Rain Showers

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    Rain Showers

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    Rain

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    Rain Likely

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    Chance Rain Showers

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    Rain Likely

Today 25 Oct South Washington Cascade Foothills

Rain Showers. A slight chance of Thunderstorms this afternoon. Highs in the lower 50s. South wind 15 to 20 Mph with Gusts up to 40 Mph. Chance of rain near 100 percent. Rainfall Amounts a half of an inch to one Inch, except higher Amounts possible in Thunderstorms.

Tonight 25 Oct South Washington Cascade Foothills

Rain Showers with a slight chance of Thunderstorms. Lows around 40. Southwest wind 15 to 20 Mph. Gusts up to 45 Mph, decreasing to 35 Mph after midnight. Chance of rain near 100 percent. Rainfall Amounts a half of an inch to one Inch, except higher Amounts possible in Thunderstorms.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Lake Merwin Temperature Statistics

October Temperature

Southwest Washington Regional Airport (22.4 miles)

  • Lowest 15 October, 2025

    32 °F

  • Average October

    54.2 °F

  • Highest 7 October, 2025

    80.1 °F

Climate (2020–Present)

Southwest Washington Regional Airport (22.4 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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