Arizona weather forecast: Extreme Heat Warning begins in Phoenix

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Evening Weather Forecast - 6/29/25

It's going to be a hot start to the week, but we might see some rain soon!

Our Excessive Heat Warning has officially begun with a major heat risk impacting the Valley through Tuesday.

What we know:

Temperatures on Sunday topped 114, which is 7 degrees above normal. Tonight we can expect overnight lows dropping to around 87 degrees.

Monday will be the warmest day under the excessive heat with a high close to 116 degrees. There will be a high risk of heat-related illnesses including heat exhaustion and heat stroke.

Make sure to stay hydrated and avoid exposure to the sun during peak heat.

Monsoon Moisture Approaches:

Temperatures will eventually cool down to below-average readings as we get closer to the 4th of July when moisture begins to move in.

Showers and thunderstorms are still forecast to move into the high country beginning on Tuesday.

Shower chances remain highest on Thursday and potentially a chance of thunderstorms on Friday for the Valley.

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.

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)
  • az511.com

Driving in extreme temperatures

The Arizona Department of Transportation’s tips for driving in extreme temperatures include: 

Have sun protection: In addition to an umbrella, take sunscreen and a wide-brimmed hat and wear loose-fitting, light-colored cotton clothing.

Fuel up: Keep your tank at three-quarters full. Running out of gas, especially in a remote location, is dangerous in extreme heat.

Hydrate: Take a cooler to keep extra drinking water cold, and consider adding several frozen bottles of water to use for cooling off or to thaw and drink if needed. Make sure everyone, including pets, stays hydrated.

Get help: If your vehicle breaks down in extreme heat, call for assistance right away to reduce wait time, and run the AC. If the AC isn’t working, roll down all windows.

Wait safely: If the temperature inside your vehicle becomes too hot, everyone, including pets, should exit carefully and seek out or create a shaded area as far away from the travel lanes as possible. Be careful walking on the road surface, which can be hot enough to burn skin. Keep your shoes on and try to keep your pets’ paws off the pavement. If you are stopped along the highway, raise the front hood and turn on hazard lights. Please keep in mind that parking in tall brush can start a fire. 

Check your vehicle: You can help avoid breakdowns and blowouts by making sure your vehicle is in good operating condition. Check your air conditioner and coolant levels, top off any vital engine fluids and make sure your battery is up to par. Check your tire pressure, as the combination of under inflated tires and hot pavement can lead to a blowout.

MORE: https://azdot.gov/about/transportation-safety/severe-weather

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