Monument Valley Weather Forecasts. Weather Underground provides local & long-range weather forecasts, weatherreports, maps & tropical weather conditions for the Monument Valley area.

The Service has issued a flash flood watch for some areas of La Paz County from 1 p.m. to 9 p.m., Monday, Aug. 25.

Here's everything to know about Monument Valley, including when to visit, whether it's in Arizona or Utah and how long the scenic drive takes.