A National Weather Service graphic indicates locations predicted to have record-high temperatures on March 18, 2026. Screenshot/National Weather Service
Record high temperatures are popping up across the Southwest this week, as an early heat wave grows and expands eastward.
The weather prediction center warned on March 17 that temperatures from the Southern California coast across parts of Arizona would exceed 100 degrees Fahrenheit over the coming days. Heat advisories have been issued for a majority of the California coastline from the Mexico Border to north of the San Francisco Bay area, with extreme heat warnings in effect inland from Palm Springs and Barstow to Las Vegas and Death Valley, and across the southern half of Arizona to the New Mexico border.
