Hottest day of the year (so far) expected today

Posted: Updated:

PHOENIX -- The hottest day of the year is expected today, as the mercury rises to around 108 degrees. 

With ample sunshine, we also have pollution problems again today for ozone. The Arizona Department of Environmental Quality has upgraded yesterday's ozone health watch to a high-pollution advisory. That means ozone is expected to exceed unhealthy levels. 

Today is also the start of the monsoon, our summer thunderstorm season.  It's defined as June 15 through Sept. 30, although there are no thunderstorms in the forecast just yet. 

The next week looks warm and dry, although afternoon high temperatures will come down to near 100 degrees over the weekend. 

A trough of low pressure is expected to swing by to our north, bringing the cooler temperatures along with a return of windy conditions.  Breezes will pick up across the deserts of the state late tomorrow, but there is a fire weather watch in effect for the high country of Northern and Eastern Arizona for even stronger winds and low relative humidities.  Winds are expected to be sustained between 20 and 25 mph Thursday through Saturday, with gusts possible up to 35 mph. 

>>> Watch video: Monsoon Arizona 2011: The Making of the Monsoon