Lake Merwin Weather Forecast

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    Rain Showers

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    Rain

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    Rain

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    Rain

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    Rain Showers

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    Rain Showers Likely

Today 13 Mar South Washington Cascade Foothills

A chance of rain Showers with a slight chance of Thunderstorms this Morning, then rain Showers with a slight chance of Thunderstorms this afternoon. Some Thunderstorms may produce small hail this afternoon. Snow level 1500 feet. Highs in the mid 40s. Southwest wind 5 to 10 Mph. Chance of rain 90 percent. Rainfall Amounts a tenth to a quarter of an Inch, except higher Amounts possible in Thunderstorms.

Tonight 13 Mar South Washington Cascade Foothills

A chance of snow Showers. Rain Showers with a slight chance of Thunderstorms in the Evening, then a chance of rain Showers after midnight. Some Thunderstorms may produce small hail in the evening. Snow level 1000 feet. Snow accumulation up to 1 inch. Lows in the lower 30s. South wind 5 to 10 Mph. Chance of precipitation 90 percent. Rainfall Amounts a tenth to a quarter of an inch.

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Lake Merwin Temperature Statistics

March Temperature

Southwest Washington Regional Airport (22.4 miles)

  • Lowest 6 March, 2025

    30.9 °F
  • Average March

    46.5 °F
  • Highest 1 March, 2025

    61 °F

Climate (2020–Present)

Southwest Washington Regional Airport (22.4 miles)

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  • Average Low 2020–2025

    44.9 °F
  • Average 2020–2025

    52.6 °F
  • Average High 2020–2025

    62.1 °F
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