PHOENIX -- Strong high pressure will slowly build over the region from the west, allowing afternoon temperatures to heat up into 110-degree territory across most of the Valley through late week.
Sunday morning, Phoenix Sky Harbor reported a low temperature of 86 with an afternoon high of 109. The normal high for this date is 107. Last year, Phoenix set a daytime high temperature record for this date of 119.
The humid feel to the air Sunday should thin out heading into Monday, but as the ridge of high pressure migrates northeast, moisture from the Gulf of Mexico will increase late week. This should signal the early beginnings of the summer monsoon.
Expect a small chance of isolated storms to hit the Valley potentially by Independence Day.
Storm chances will increase across southeastern Arizona Thursday. This will bring about a threat of blowing dust to the Valley. Air quality is expected to deteriorate during this time.