THERMAL, Calif. (AP) — A desert community in southwestern Arizona reached 110 degrees (43.3 C) on Thursday, breaking a record for the highest March temperature recorded in the United States.
The record-setting temperature was recorded just outside Martinez Lake, Arizona, in the Yuma Desert, as a winter heat wave scorched the Southwest, according to the National Weather Service. The community is about 145 miles (233 kilometers) west of Phoenix and sits on the Arizona-California border.
The previous record of 108 degrees (42.2 C) had been set in Rio Grande City, Texas, in 1954 and was tied Wednesday by the tiny desert community of North Shore, California.
By Thursday, several more California locations had hit 108 degrees (42.2 C). Among them were Cathedral City, near the desert destination of Palm Springs, and the aptly named town of Thermal, northeast of San Diego. The triple-digit temperatures came on the last day of winter.
Thermal was forecast to hit 110 (43.3 C) on Friday and could tie the record.
“For some perspective, the average first 105-degree day of the year normally occurs on May 22nd,” NWS said in a statement.
The blistering wave of heat this week has established record highs in dozens of locations, including Phoenix, San Diego, Los Angeles, Las Vegas and San Francisco.
Ruben Pantaleon said the heat didn’t bother him as he used a squeegee to clean car windshields at an intersection in Thermal on Thursday afternoon. He wore shorts and had a supply of electrolyte drinks on hand.
“I drank three of those so far,” he said under the blaring sun. “It’s the desert. It gets real hot. I’m not worried about it.”
Several cities on Thursday experienced their hottest March day on record, according to the NWS.
Phoenix reached 105 degrees (40.6 C), surpassing the previous record of 102 degrees (38.9 C) set Wednesday.
Wednesday also marked the earliest day of triple-digit temperatures in Phoenix. The last time Phoenix temperatures climbed above 100 during March was almost 40 years ago. Hiking trails around the city were closed Thursday because of the risk of heat illness.
Las Vegas hit 95 degrees (35 C), topping the previous record of 94 degrees (34.4 C) set Wednesday.
It will continue to be 20 to 30 degrees above normal temperatures for March for the rest of the week in the Southwest before the mercury drops slightly starting Sunday. Many other cities in the region are expected to see their earliest 100-plus degree (37.8-plus C) day on record, according to the weather service.
Weber reported from Los Angeles. Associated Press writer Hannah Schoenbaum contributed from Salt Lake City.
Copyright 2026 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed without permission.
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