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Last Map Update: Wed, Mar 18, 2026 at 7:08:26 am MST

Watches, Warnings & Advisories

National Weather Service NWS Flagstaff, AZ

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National Weather Service Albuquerque, NM

National Weather Service NWS Tucson Arizona

Extreme Heat Warning

Heat Advisory

Hourly Temperature Forecast Today

Record Breaking Temperatures

Extreme Heat Warning

First 100 Degree Day Stats

Morning lows will be relatively mild today and through this unprecedented March heat wave that will last into the weekend, but don't let these mild mornings fool you. Temperatures will quickly warm into the 80s by mid morning and then 90s late morning, followed by triple digit highs during the afternoon. Don't underestimate the heat. Reduce outdoor activity during the heat of the day, take frequent breaks in the shade or in air conditioned spaces, and stay hydrated!

A record strong ridge of high pressure for this time of year will slide eastward and position itself over the Western US during the latter half of the work week, helping to push lower desert highs above 100 degrees today, then around or just above 105 degrees for Thursday-Saturday. Daily records will likely be broken by nearly 10 degrees through the weekend. Extreme Heat Warnings are in effect through Sunday for portions of the region (starting on Thursday for Southern Arizona).

Extreme Heat Warnings will be in effect for Southeast California starting today and Southern Arizona starting Thursday. They will remain in effect through Sunday. Not only will all-time March temperatures be broken (and likely April as well), but also the earliest occurrence of 100 degrees in the Phoenix area.

Phoenix and neighboring lower desert communities will almost certainly reach 100 degrees by the middle of next week. This would be the earliest occurrence of 100 degrees on record for the Phoenix area.