Phoenix weather: Warm Wednesday

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PHOENIX -- Wednesday is likely to be the warmest day of this week, with afternoon temperatures topping out about five degrees above average for this time of year in the Valley. 

The day started with mostly clear skies and overnight lows in the 70s. By the afternoon, temperatures will be close to 104 degrees with nothing but sunshine expected. 

A gradual cool-down is coming our way, with a high of just 101 expected by Saturday, which is the official start of autumn. 

Slightly cooler weather is expected early next week as a low-pressure system moves our way from the west.  At this point, it looks unlikely we'll get any rain from the storm, but highs should drop back to the upper 90s by early next week with more cloud cover also likely. 

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Tuesday's Ozone Health Watch has been extended through today for the Valley.  People with sensitive respiratory systems are urged to limit their time outside, as high levels of ground-level ozone can make it tougher to breathe.  Everyone is urged to help out by carpooling and refueling after dark. 

Read: Ozone season officially under way; invisible danger in the air