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Sampson, WA Weather Forecast
Sampson, WA Weather Forecast Date: 501 PM PDT Fri Sep 18 2026
The area/counties/county of: South Washington Cascades, including the cities of: Mt. St. Helens, Larch Mountain, and Indian Heaven Wilderness.or toggle through each period.
Tonight... Mostly clear this evening, then becoming partly cloudy. Free air freezing level 13000 feet. Winds light.
Saturday... Mostly sunny. Free air freezing level 13000 feet, increasing to free air freezing level 14000 feet in the afternoon. Winds light.
Saturday Night... Partly cloudy in the evening, then becoming mostly clear. Free air freezing level 14000 feet. Winds light.
Sunday... Sunny. Free air freezing level 14000 feet. Winds light.
Sunday Night... Mostly clear. Free air freezing level 13000 feet. Winds light.
Monday... Mostly sunny. Free air freezing level 13000 feet.
Monday Night... Mostly clear in the evening, then becoming partly cloudy. Free air freezing level 13000 feet.
Tuesday... Mostly sunny. Free air freezing level 13000 feet.
Tuesday Night... Partly cloudy. Free air freezing level 12000 feet.
Wednesday... Mostly sunny. Free air freezing level 12000 feet.
Wednesday Night... Partly cloudy. Free air freezing level 12000 feet.
Thursday... Mostly sunny. Free air freezing level 12000 feet.
Thursday Night... Partly cloudy in the evening, then becoming mostly cloudy. A 20% chance of rain. Snow level above 8000 feet.
POP = Probability of Precipitation
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