Check out the current and 10 day

Weather for Ski Lookout Pass
and see the

Webcams for Ski Lookout Pass
and

Webcams for I-90 at the Idaho - Montana line Exit 0

Weather for Avery, Idaho which is 9 miles below Pearson. ID, which is the bottom of the trail.   

These links will give you a good sense of the weather you will encounter out along the Route of the Hiawatha Scenic Bike Trail.