A hazy morning Thursday across Interstate 10 on Tucson’s northwest side. The haze was primarily due to a dust storm in northern Mexico, officials said.

Record-breaking heat that scorched Tucson for days is set to be replaced by more typical summer weather here over the weekend, but the haze that settled over the Old Pueblo Thursday could take a while to drift away, forecasters say.

The hazy air hanging over Tucson beginning Thursday morning is the product of a northern Mexico dust storm, according to the Arizona Department of Environmental Quality.

Dalton Van Stratten, a meteorologist with the National Weather Service in Tucson said upcoming monsoon rains hitting the Tucson area over the course of the weekend could stir up additional dust and air pollutants that could especially affect people with respiratory issues.

Air pollutants come from a variety of natural and manmade sources, including dust storms and wildfires, according to the ADEQ. Some of the pollutants that help form haze have also been linked to serious health problems like respiratory illness, decreased lung function and even premature death, ADEQ says.

Meanwhile, the excessive heat warning for the Tucson area was extended until 8 p.m. Thursday, with temperatures expected to rise to a high between 107 to 111 degrees in the area. A blowing dust advisory also was issued for the region on Thursday.

Van Stratten urged people to stay indoors whenever possible, and to take extreme caution when encountering a dust storm.

Monsoon weather was expected to make its way to the Tucson area by Thursday evening, boosting the possibility of rain to a 60% chance.

There is also a 50% chance of daily rain showers predicted throughout the weekend here, and slighter chances for rain into next week, according to the weather service.

The more usual summer weather forecast follows days of record-breaking heat.

On Wednesday Tucson broke its daily heat record for the third consecutive day with a high temperature of 110 degrees. That was one degree hotter than the previous record for July 10 of 109 degrees set in 2021, 2019 and 1979, the National Weather Service in Tucson said.

That came after the record-setting 111 degrees on Tuesday and 112 degrees on Monday.

See what today's weather forecast looks like in Tucson.

Tucson is expected to see a high of 107 degrees on Friday and 104 degrees on Saturday.

But it could be windy too, especially through Friday, forecasters say.

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