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A record-shattering March heatwave across the U.S. would be "virtually impossible" without climate change according to World Weather Attribution. With some regions hitting 107°F, researchers warn that 25% of all national March heat records could be tied or broken this month.

(US), with temperatures that are more typical of summer than mid-March (AccuWeather, 16 March 2026). Driven by a strong, slow-moving high pressure system, called a ‘heat dome’, the event is causing temperatures to rise 11-17℃ (20-30℉) above average across parts of California, Nevada and Arizona (BBC, 17 March 2026).

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