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Source Lake, WA Weather Forecast
Source Lake, WA Weather Forecast Date: 236 PM PDT Wed Sep 23 2026
The area/counties/county of: Cascades Of Southern King County, including the city of Snoqualmie Pass.or toggle through each period.
Tonight... Mostly cloudy. Patchy fog late in the evening. Freezing level near 11000 feet. Light wind in the passes.
Thursday... Mostly cloudy. A slight chance of rain late in the afternoon. Snow level near 9000 feet. Afternoon pass temperatures in the lower 60s. Light wind in the passes.
Thursday Night... A chance of rain in the evening. Rain at times after midnight, then a chance of showers in the morning. Snow level near 9500 feet. Rainfall amounts a tenth to a quarter of an inch possible. Light wind in the passes.
Friday... Showers likely in the morning, then showers and a slight chance of thunderstorms in the afternoon. Snow level near 7000 feet. Rainfall amounts a half inch to one inch possible, except higher amounts possible in thunderstorms. Afternoon pass temperatures in the upper 40s. Light wind in the passes.
Friday Night... Mostly cloudy with showers in the evening, then mostly cloudy with a chance of showers after midnight. Snow level near 6000 feet Decreasing to 5000 feet after midnight. Rainfall amounts a quarter to a half inch possible. Light wind in the passes.
Saturday... Mostly sunny. Freezing level near 5500 feet.
Saturday Night... Partly cloudy in the evening then becoming mostly cloudy. Freezing level near 8500 feet.
Sunday... Partly sunny. Freezing level near 8500 feet.
Sunday Night... Partly cloudy. Freezing level near 8500 feet.
Monday... Partly sunny. Freezing level near 8500 feet.
Monday Night... Partly cloudy. A slight chance of rain in the evening, then a chance of rain after midnight. Snow level near 7000 feet.
Tuesday... Partly sunny. A slight chance of rain in the morning, then a chance of rain in the afternoon. Snow level near 7500 feet.
Tuesday Night... Mostly cloudy with a chance of rain. Snow level near 8000 feet.
POP = Probability of Precipitation
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