weather in july The average temperature in Yosemite Valley is a high of 90 and a low of 57 degrees Fahrenheit (32/ 14 degrees Celsius). At 8,000 feet, the average temperature in Tuolumne Meadows is a high of 72 and a low of 38 degrees Fahrenheit (22/ 3 degrees Celsius). On average, it rains only one day in July.