Summer days are pleasant and nights are cool at 8,000-9,000 feet. July is the warmest month with an average daytime high temperature of 83 degrees and a nighttime low of 47. Much of the area's precipitation comes as afternoon thundershowers during mid to late summer. Spring and fall weather is highly variable. Cold winter days are offset by high altitude sun and dry climate.
Winter nights are sub-freezing.
Alaskan cold fronts can descend on the Colorado Plateau bringing temperatures as low as 30 degrees below zero. The 18-mile main park road winds along the edge of the plateau, terminating at the south end of the park. Return to the entrance via the same road. Spur roads and pullouts offer opportunities for viewing and trailhead parking. In summer, parking at most viewpoints is extremely congested.