Areas close to Colorado should have mostly clear viewing of the eclipse.

Southeast Wyoming should sneak out a clear morning while there will be a thin area of high cloud over central or western Wyoming. Further west, Idaho and Oregon will be in good shape.

Here in Colorado, there are some clouds around, but they will be mostly high, thin clouds over the northern part of the state, closest to the path of totality, so you should still get a good show.

A more detailed update is here:

http://opensnow.com/news/post/the-eclipse-cloud-forecast-looks-good-for-much-of-the-western-us-but-there-will-be-some-issues