Weather at Grand Canyon Weather at Grand Canyon South Rim Spring comes early to the South Rim but the weather can be quite unpredictable. July and August are the wettest time of the year and thunderstorms are frequent and can also be quite severe. Fall can also be a very unpredictable time of year and the weather can vary significantly from day to day. Snow normally does not start falling until November. Snow doesn't usually last long on the South Rim unless a major storm hits.
Ice is common in the upper sections of all of the side canyons during the winter months.
Summer days at the north rim are delightfully clear and cool except for the occasional thunderstorms in July and August. The inner canyon is a desert environment and should never be taken lightly. There is very little shade in the inner canyon and if you plan to be hiking there during the summer months you should plan your hikes for early morning or late afternoon and rest during the hottest part of the day. Most of the rain that falls occurs during the months of July and August. Click here for The Weather Channel forecast.