Not too shabby weather-wise so far this weekend. At times, we've seen filtered sunshine, as a ridge of high pressure is sliding to our east. Temperatures have been slightly cooler compared to Friday; this is due to a piece of energy passing to our north. Saturday valley highs topped out in the middle to upper 80s. The normal high temperature for the Phoenix Metro is 86 degrees.
On Sunday, the region will be in-between weather systems; this will translate to a sun-filled, slightly cooler day. Valley highs will reach the middle 80s. Mountain highs will range from near 60 to the upper 70s.
The next low-pressure system will dive southward, from the Pacific northwest, and head in our direction late Monday. Ahead of that incoming low, the pressure gradient will tighten up; this means winds will increase on Monday afternoon. Southwest winds could gust up to 25 to 35 mph across the valley. The highest wind gusts will impact the mountains. Winds could blast up to 45 to 55 mph in the high deserts on Monday afternoon.
Since this system will mainly clip the area, to the north, precipitation will likely not be a major factor. However, some mountain locations could receive up to a quarter of an inch of total rainfall. Meanwhile, folks in the valley will be lucky to squeeze out one tenth of an inch of total rainfall Monday night into Tuesday. Most will not receive rain. Most across the high deserts will also likely not see snow. Snow accumulations will likely be confined to the highest elevations of the San Francisco Peaks and Kaibab Plateau.
Once the associated cold front, leading edge of cooler air, slides through the area, temperatures will plunge starting Tuesday. Valley highs will drop from the upper 80s on Monday to the middle to upper 70s on Tuesday. High temperatures across the high deserts will only muster the 50s to 60s. The cooler air will persist through mid-week. Valley locations will likely struggle to reach 80 degrees on Wednesday afternoon.
The sharp cool down will be short-lived. As high pressure will build back into the region, temperatures will rebound starting Thursday. High temperatures will climb slightly above normal to the upper 80s, near 90 degrees Thursday through next Saturday.