San Juan County, UT, immediately adjacent to Navajo Mountain and the Navajo Reservation. Dangling Rope Marina, the closest source of first aid, water, gas, and supplies, is open year-round. A ranger station there is staffed intermittently year-round. Rangers are at Rainbow Bridge daily from Memorial Day through Labor Day, less frequently other times of the year. Summers are extremely hot with little, if any, shade.
Winters are moderately cold with night time lows often below freezing.
Spring weather is highly variable with extended periods of strong winds. Fall is generally mild. Recommend lightweight, light colored clothing in summer, including a hat. Layers of clothing are best other times of year. Public access to Rainbow Bridge is by boat across Lake Powell.