Snoqualmie 10 Day Weather. 1  Saturday:The Snoqualmie forecast for Apr 15 is 47 degrees and Patchy rain possible. There is 62 percentage chance of rain and 2 mph winds from the West. 2  Sunday:The Snoqualmie forecast for Apr 16 is 54 degrees and Partly cloudy. There is 50 percentage chance of rain and 4 mph winds from the East.