Phoenix, Arizona – Temperatures across the Southwest could climb rapidly this week, with Phoenix approaching 95°F by Thursday afternoon as a powerful ridge of high pressure spreads heat across Arizona, Nevada, and Utah during the March 19–25 period.
According to the National Weather Service Climate Prediction Center, the region faces a moderate risk of much above normal temperatures between Wednesday and Thursday, with the strongest heat centered across southern Nevada, western Arizona, and much of Utah.
Afternoon temperatures across the Desert Southwest may run 15 to 20 degrees above mid-March averages. In Arizona, Phoenix, Mesa, and Glendale could climb into the low to mid-90s, while cities along the Interstate 10 corridor from Yuma through Casa Grande approach the lower 90s. Pavement temperatures across metro Phoenix may exceed 115°F during peak afternoon hours, increasing heat stress for outdoor workers and stranded motorists.
In Nevada, Las Vegas and Henderson could reach the upper 80s, while Reno may rise into the upper 60s. Across Utah, Salt Lake City, Provo, and Ogden could climb into the mid to upper 70s, well above seasonal averages.
Utilities across major metro areas often see early spikes in electricity demand during sudden spring heat events. Residents are encouraged to check cooling systems, carry water while traveling, and avoid extended outdoor activity during peak afternoon heat.
The warm pattern is expected to persist across the Southwest through the March 19–25 window, and additional heat outlooks or advisories could be issued if temperatures trend higher later this week.
