Overview
- Las Vegas hit 93 degrees at Reid Airport on Sunday, marking a fifth straight daily record as the Extreme Heat Warning ended that night.
- National Weather Service outlooks keep Las Vegas in the mid to upper 90s through Wednesday with at least a 75% chance of 90-degree highs each day through Thursday, putting nine March 90-degree days and a record-warm month in play.
- Phoenix reached 106 degrees over the weekend in what officials called one of its earliest extreme heat events, with first responders treating more than 400 people at an air show and hospitals taking about 30 patients.
- Meteorologists say the heat dome, a high-pressure lid that traps hot air, is shifting toward the Plains and Midwest this week with over 200 daily records forecast and the Southern Plains flagged for the most widespread impacts.
- The spike is rare for March in the Southwest, with Las Vegas logging only 13 March days at 90 or higher from 1937 to 2025, a jump that raises health, air-quality, and wildfire concerns as nights stay unusually warm.