PHOENIX (AZFamily) – A trough of low pressure and strong cold front are headed toward Arizona, bringing big weather changes starting today. The average high for this time of year in Phoenix is 85 degrees, and we’ll once again top out well above that in the low 90s today. But a cooling trend begins tomorrow thanks to a cold front headed our way. Ahead of that front, look for breezy conditions in the Valley today, with winds around 10 to 20 mph this afternoon and evening.