Phoenix weather: Last day of summer!

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PHOENIX -- It's finally here.  After months of sweltering heat, stifling humidity and blistering sunshine, fall is less than 24 hours away.

However, the forecast for the start of fall doesn't look a whole lot different than the forecast for the end of summer. 

Today's high temperature should be right around 105 degrees in the Valley. That's six degrees above average for today's date, and only two degrees away from the record of 107 degrees. 

Saturday's forecast looks almost identical: A high of 105 degrees under mostly sunny skies.  Overnight lows will continue to dip to the 70s under mostly clear skies. 

On Sunday, the ridge of high pressure that has been parked over the Southwest will have started to shift east, and temperatures will ease up a couple of degrees under partly sunny skies. 

On Monday, a low-pressure system moves our way from the west, bringing our highs back to the double digits with more clouds, but very slim chances for rain.  Our highs will continue to drop off next week, with low 90s looking likely for the end of next week.

Get the latest forecast for your neighborhood

Phoenix rocks on the autumnal equinox

The 2012 autumnal equinox is Saturday morning at 7:49 a.m. Pacific time. It marks the official start of fall, the time when days and nights are just about equal. 

From here on, days will begin to get shorter.  This is also the time of year when the sun rises due east and sets due west. 

Related: Cooler fall temps are almost here, but the sun is still dangerous -- for drivers