PHOENIX -- Monday and Tuesday are going to be gorgeous Arizona fall days, but come Wednesday, you'll want to grab your jacket.
Highs are expected to drop down into the 60s -- yes, 60s -- but the mercury won't stay there long.
Temperatures should bounce back in the upper 70s or perhaps the low 80s for Halloween. Overnight lows, however, will be quite chilly.
Comments have been turned off for this article.