Air quality warnings and dangerous heat

PHOENIX — The heat is on!

As high pressure builds, Phoenix is ​​facing its first 110-degree days of the year this week.

On average, our first 110 degree day is around June 11th. The earliest ever recorded was May 8, 1989.

This year it will likely be Wednesday, June 5 with a forecast of up to 110 degrees in Phoenix.

Warnings for excessive heat are in effect for the Valley and much of lower Arizona on Wednesday, Thursday and Friday. So they will be ABC15 Weather Action Days as a reminder to take action to keep yourself and others safe in this dangerous heat.

The risk of heat-related illnesses (such as heat exhaustion and heat stroke) will increase as temperatures approach 113 degrees on Thursday and Friday.

We could set a new record on Thursday, as the current record is 111 degrees, set in 2016.

The overnight low temperatures will be warmer and could also set records.

Lows will only cool into the mid-80s in Phoenix Thursday through Sunday, potentially bringing new record warm lows for those days.

The dangerous combination of warm mornings and sweltering hot afternoons will only increase your risk of heat illness, so now is the time to prepare. Stay hydrated, limit time outdoors during the hottest part of the day, take breaks indoors, and never leave children or pets in your car.

We also continue to struggle with high ozone pollution in the Valley. This is the best season for it during these long, sunny days with generally light winds.

A Advice on high ozone pollution is in effect today and a Ozone high pollution watch was issued for Wednesday. That may be upgraded to an advisory as we get closer.

If you have asthma, COPD, or another breathing problem, limit time outside in the afternoon hours on high-pollution days, otherwise you may have trouble breathing. Exposure to ozone can increase the number and severity of asthma attacks, cause or worsen bronchitis or other lung diseases, and decrease the body’s ability to fight infections.

Children, older adults, and anyone who tries to exercise outdoors can also experience health effects from this ozone pollution. Symptoms may include itchy eyes, nose and throat, wheezing, coughing, shortness of breath, chest pain and upper respiratory problems.

We can all help prevent the pollution problem from getting worse. If you have a gas-powered car, try to drive as little as possible this week. Carpooling, working from home or refueling your car in the evening also helps.

As high pressure concentrates to our east later this week, we will track some moisture moving into Arizona. This will lead to a small chance of isolated showers and thunderstorms in the high country from Thursday and will continue throughout the weekend.

Not much rain is expected from any developing storms, so we’ll really have to watch out for lightning-caused wildfires.

This will be a bit of a taste of monsoon season for parts of our state. The monsoon officially starts on June 15.

The outlook for this year is likely to favor another drier and warmer season than normal.


Precipitation totals in 2024:

Official rainfall in Sky Harbor: 3.80 inches (+0.88 inches from average)

Valley average (Phoenix rainfall index): 3.81″


Precipitation totals in 2023:

Official rainfall in Sky Harbor: 4.21 inches (-3.01 inches from average)

Valley average (Phoenix precipitation index): 5.47″


Daily precipitation reports from across the valley can be found here.



Average monsoon rainfall in Phoenix (1981-2010): 2.71 inches of rain

NEW Average Monsoon Rainfall in Phoenix (1991-2020): 2.43 inches of rain

Average annual rainfall in Phoenix (1981-2010): 8:03″ of rain

NEW Average annual rainfall in Phoenix (1991-2020): 9 inches of rain


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