Arizona weather forecast: Extreme heat warnings and mountain thunderstorms
Prepare for very hot temperatures this week in Arizona
FOX 10's Erica Horvatin has the latest on this upcoming week's hot weather as we head into the 110+ temps.
Sunday was a hotter day, with a high of 110 degrees in Phoenix.
This Week:
Temperatures will turn up another notch this week, and extreme heat warnings will take effect Tuesday through Thursday for most of southern Arizona and the Grand Canyon.
Strengthening high pressure will allow temperatures to heat into the 110s all week in the Valley. Wednesday will be the hottest day, with a high around 114 degrees.
Monsoon moisture will cause daily storms in the mountain terrain. On Monday morning, clouds will increase in the Valley, and there will be a slight chance for a couple of sprinkles during the AM commute.
The Valley will see sunnier skies thereafter. However, in the White Mountains and Mogollon Rim, thunderstorms will develop by midday, continuing through the evening. Storms will move northeast toward the Four Corners by late Monday night. Lightning and erratic winds from storms may ignite wildfires or cause spread of current wildfires in the high country.
Luckily, other than thunderstorm wind gusts, the winds will stay lighter this week. Moisture will surge the humidity across Arizona, hopefully helping current fire fights, and bringing better wetting rainfall by the second half of the work week.
Looking Further Ahead:
The Valley is unlikely to see any real rain throughout the work week, but there may be potential for dust storms or pop-up showers when storms develop in southern Arizona later this week. We will keep you updated here!
You can always check the latest weather conditions by visiting the FOX 10 Phoenix weather page, or download the Free FOX 10 Weather app, which is available on Apple iOS and Android.
Scroll down this page for satellite and radar, day planner, records, current temperatures, 10-day forecast, forecast highs, and recent rainfall totals, plus live video feeds.

The following heat safety information was provided by the Scottsdale Fire Department.
What are Heat Emergencies?
Heat Cramps: Profuse sweating, fatigue, extreme thirst, muscle cramps
Heat Exhaustion: Headache, dizziness, weakness, nausea/vomit, Cool/moist skin
Heat Stroke: Elevated temp. +103degrees, confusion/irrational behavior, dry/hot skin, rapid shallow breathing, rapid weak pulse (shock), seizures, unconscious
What to do
- Get person into shade or cool location.
- Cool person with cool, wet cloths (neck, groin, armpits, head) and fan body.
- Sip cool water if person is alert.
- For muscle cramps, massage muscles gently, but firmly until relaxed.
- *If symptoms worsen, call 911.
What not to do
- Do not give anything by mouth if person is vomiting, unable to swallow or unconscious.
- Do not underestimate the seriousness of a heat emergency.
- Prevention/Preparation for hike/exercise in heat.
Know your limitations
- Hydrate (begins day prior to hike/exercise, hour before hike, during and after).
- Wear proper clothing, lightweight and light color, protect head, proper shoes.
- Always carry a cell phone and best to hike with company.
- Always tell someone where you are hiking and when to plan to return.
Preventing heat exhaustion/heat stroke
The Arizona Department of Health Services stated the following precautions can be taken to prevent heat exhaustion or heat stroke:
- Stay in air-conditioned buildings.
- Find a cooling center/hydration station.
- Limit outdoor activity during the hottest part of the day (mid-day).
- Check on at-risk friends, family, and neighbors at least twice a day.
- Drink water before, during, and after working or exercising outside.
- Check the UV Index.
- Check the heat risk map.
Road Conditions
- Call 511 anywhere in Arizona or 1-888-411-ROAD (7623)
The Source: Information for this article was gathered by the FOX 10 Weather Experts.






