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TUCSON - Big changes are on the way to southern Arizona.

Still dealing with temperatures slightly above average over the next couple of days with highs hovering right around 90, according to Meteorologist John Patrick. Low pressure sitting off the northern California coast starts to track our way by midweek for a long awaited cool down.

We'll start to feel the effects of this system by Wednesday with breezy conditions and highs starting to come down into the upper 80s. The low moves overhead on Thursday dropping daytime highs in Tucson to 83. Enough moisture will be associated with this system to bring about a slight chance of showers and storms to the valley floors with mountain rain a good possibility on Thursday. The coolest temperatures since April are expected this Friday with a forecast high of 79.