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Historic Heatwave: U.S. Sees Record March Temperatures

3/21/2026

25 2 Full Breakdown

Summary

Story summary

On March 19, 2026, a community near Martinez Lake, Arizona, reached 110 degrees, hottest March temperature in U.S. history.
The heatwave reached the West Coast, with Phoenix at 101 and Las Vegas at 99 degrees.
North Shore, California, tied a U.S. record at 108 degrees.
Officials closed hiking trails in Phoenix to prevent heat-related illnesses.
National Weather Service forecasts temperatures will remain 20 to 30 degrees above average until Sunday.

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Story summary

On March 19, 2026, a community near Martinez Lake, Arizona, reached 110 degrees, hottest March temperature in U.S. history.
The heatwave reached the West Coast, with Phoenix at 101 and Las Vegas at 99 degrees.
North Shore, California, tied a U.S. record at 108 degrees.
Officials closed hiking trails in Phoenix to prevent heat-related illnesses.
National Weather Service forecasts temperatures will remain 20 to 30 degrees above average until Sunday.