Phoenix, Arizona – Well-above normal temperatures will continue across central and southern Arizona through Tuesday before a noticeable pattern shift brings cooler conditions and increasing rain chances later this week, potentially impacting travel on major highways.
According to the U.S. National Weather Service in Phoenix, high pressure will keep warm and dry weather in place early in the week. Afternoon high temperatures in Phoenix are forecast to reach the mid-80s, running 10 to 15 degrees above normal. Similar warmth is expected along Interstate 10 through the Valley and west toward Buckeye and Quartzsite.
These unusually warm conditions may lead to areas of Minor HeatRisk across the lower deserts, particularly during peak afternoon hours. Motorists and outdoor workers traveling along I-10, Loop 202, and U.S. 60 should plan for extended exposure to warm temperatures through Tuesday.
By mid to late week, forecasters say a more unsettled weather pattern will develop as weather systems move into the region. High temperatures are expected to cool by several degrees, returning closer to seasonal norms by Thursday and Friday. Along with the cooling trend, rain chances will increase to around 20% to 50%, especially across higher terrain in northern and eastern Arizona.
Travelers along Interstate 17 toward Flagstaff and Interstate 40 across northern Arizona may encounter changing conditions late in the week, including cooler temperatures and periods of rain. While widespread flooding is not expected, wet roads could slow travel during peak commute times.
Overnight low temperatures will remain mild early in the week before trending cooler toward the weekend. Forecasters note that conditions should stabilize again by the weekend, with temperatures remaining slightly above normal.
Commuters, students, and young workers should remain weather-aware as the transition from heat to cooler, wetter conditions may affect travel timing later this week. The National Weather Service advises checking updated forecasts, especially for those planning travel into higher elevations by Friday.
