National Weather Service United States Department of Commerce

Areas of Severe Thunderstorms and Heat

Scattered severe thunderstorms and excessive rainfall are possible today in the Mid Atlantic, posing a risk for damaging winds and isolated flash flooding. Extreme Heat Warnings are in effect today for northeast Texas into southern Oklahoma and Arkansas. Extreme Heat Warnings are also in effect for the Desert Southwest today into Sunday. Read More >

NWS Flagstaff, AZ

Weather Forecast Office

NWS Forecast Office Flagstaff, AZ

Weather.gov > NWS Flagstaff, AZ
Click a location below for detailed forecast.

Last Map Update: Thu, Aug 20, 2026 at 5:14:46 pm MST

Extreme Heat Warning
Monsoon Ramps Up
An Extreme Heat Warning has been issued for areas of the Grand Canyon below 4000 feet through 8 PM MST Thursday. Expect temperatures as high as 111 degrees near Phantom Ranch.
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Monsoon moisture continues to move into the area. Expect precipitation chances to increase over the next couple days. Some of the storms could produce heavy rain that may lead to flash flooding so use caution if you have any outdoor plans.
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