ENVIRONMENT

Record Early Heat Shatters Southwest March Temperature Records

PUBLISHED Mar 20, 2026, 3:45 AM ET

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United States: An early-season heat wave shattered March temperature records across the U.S. Southwest on and around March 19–21, with desert sites reporting 43–44.4°C (approximately 109–112°F) and numerous cities logging new March highs, prompting weather services to document unprecedented spring warmth. Officials and scientists issued extreme heat warnings this week, with National Weather Service alerts in effect and attribution groups reporting the event was very unlikely without human-caused climate change; emergency advisories and public-safety guidance were deployed as communities faced heightened heat-related risks.

By Sarah Whitman | JQJO News

Timeline of Events

March 19: Death Valley recorded about 40°C as region warmed.
March 20: First day of spring saw many March high records and NWS warnings issued.
March 20–21: Desert sites reported 43°C–44.4°C, including Martinez Lake and locations near Yuma.
March 21: Agencies reported at least 65 cities with new March highs and continued warnings.
March 21: World Weather Attribution and scientists reported human-caused climate change made the event far more likely.

News Intelligence

Record heat means more than just a sweaty day. It can lead to serious health risks like dehydration and heatstroke. It also puts a strain on our power grid as everyone cranks up the AC. Check on elderly neighbors and drink plenty of water.

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Who Benefited

Companies producing cooling equipment, renewable-energy firms, climate researchers, and emergency-preparedness vendors saw increased demand for services, data and products as jurisdictions issued warnings and communities sought adaptation measures.

Who Impacted

Residents, outdoor workers, low-income communities, the elderly and local health services suffered heightened heat exposure, increased health risks, and greater strain on emergency response and medical resources during the early-season event.

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