Hi. . . It doesn't strike me as excessively noisy, but it does make a noise as the fabric slides over itself. As long as you are just walking, the only sound would come from where the arms slide over the body, but I've not noticed it to be irritating. If you are sensitive to this sound, though, it may bother you a bit. The waterproof fabric tends to make this swishing noise. I hope this helps some.
Answered on 12/30/2014 8:07:32 PM by Tom the walker from Oregon
I happened to have a Marmot Precip jacket and I tried them to see which one is noisier. The result: both made similar noises. Hope that helps.