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Temperatures reach 109 degrees in Phoenix; heat advisory planned Tuesday

Arizona Republic logo Arizona Republic 6/11/2019 Chris Coppola

An official heat warning doesn't take effect until Tuesday, but anyone who stepped outside Monday felt a pretty good preview.

The official high temperature in Phoenix shot up to 109 degrees, according to the National Weather Service, making it the hottest day of the summer — and of course, the year — so far.

But that mark probably won't last long.

That's because the National Weather Service said temperatures in Phoenix are expected to hit at least 110 degrees Tuesday through Thursday, with a good chance of surpassing that number.

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The Weather Service has issued an excessive heat warning from Tuesday through Thursday for lower desert areas in central and western Arizona, including the Phoenix metro area. Mid- to late-June typically can bring on temperatures that reach or exceed 110 degrees. The city's all-time record of 122 was hit on June 26, 1990.

In 2017, the third week of June saw record-setting highs for three consecutive days, including 119 on June 20, the fourth hottest temperature ever recorded in the city.

The summer monsoon's humidity can often help mitigate the extreme triple digits back below 110, but higher temperatures are common in July as well. Last year's hottest high temperature was 116 degrees, record on July 24. 

The National Weather Service advises residents and visitors to hydrate well on extreme-heat days, before becoming thirsty.

In addition, people are advised to reduce their time in the sun, make sure children or pets are not let alone in vehicles and to postpone outdoor activities.

This article originally appeared on Arizona Republic: Temperatures reach 109 degrees in Phoenix; heat advisory planned Tuesday

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