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San Tan Valley, AZ Weather. The average temperature of San Tan Valley is 71.43Â°F, which is much higher than the Arizona average temperature of 65.97Â°F and is much higher than the national average temperature of 54.45Â°F. Historical Weather. Heating Cost Index, #76.
Sunday:The Simi Valley forecast for Apr 16 is 68 degrees and Sunny. There is 27 percentage chance of rain and 7 mph winds from the Southwest. Monday:The Simi Valley forecast for Apr 17 is 66 degrees and Partly cloudy. There is 66 percentage chance of rain and 10 mph winds from the West-Southwest. Tuesday:The Simi Valley forecast for Apr 18 is 67 degrees and Patchy light rain. There is 53 percentage chance of rain and 7 mph winds from the South-Southwest.