3am:The Snoqualmie, WA forecast for Apr 15 is 39 degrees and Patchy rain possible. There is 82 percentage chance of rain and 3 mph winds from the Southeast. 6am:The Snoqualmie, WA forecast for Apr 15 is 39 degrees and Patchy rain possible. There is 83 percentage chance of rain and 3 mph winds from the Southeast. 9am:The Snoqualmie, WA forecast for Apr 15 is 43 degrees and Moderate rain. There is 77 percentage chance of rain and 2 mph winds from the South.