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This report describes the typical weather at the Grand Canyon National Park Airport (Grand Canyon National Park, Arizona, United States) weather station over the course of an average September. It is based on the historical records from 1981 to 2012. Earlier records are either unavailable or unreliable.he probability that precipitation will be observed at this location varies throughout the month. Precipitation is most likely around September 2, occurring in 30% of days. Precipitation is least likely around September 30, occurring in 19% of days.
American Canyon 7 Day Weather. 1  Friday:The American Canyon forecast for Aug 25 is 69 degrees and Sunny. 2  Saturday:The American Canyon forecast for Aug 26 is 80 degrees and Sunny. 3  Sunday:The American Canyon forecast for Aug 27 is 100 degrees and Sunny. 4  Monday:The American Canyon forecast for Aug 28 is 97 degrees and Sunny.