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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.
Simi Valley 10 Day Weather. Thursday:The Simi Valley forecast for Apr 13 is 62 degrees and Sunny. There is 58 percentage chance of rain and 12 mph winds from the West-Southwest. Friday:The Simi Valley forecast for Apr 14 is 66 degrees and Sunny.