Fall started Sunday, but brought more record temperatures to the valley. Wednesday’s high temperature of 113 made it the last 110 degree day on record and broke the record high of 108 set in 1989.

And the heat isn’t expected to subside anytime soon, according to the National Weather Service in Phoenix. Temperatures are expected to reach 110 degrees next weekend.

As residents wait to see what next week will bring, here’s everything you need to know about what the weather normally looks like and when things typically start to cool down in metro Phoenix.

When will it cool down in metro Phoenix?

From a brand nicknamed “Valley of the Sun,” Arizona’s weather starts to warm as early as late May and continues well into September or October.

The National Weather Service predicts that the average date for Phoenix to drop below 100 degrees is September 29.

The normal high for September 1 is 104 degrees, but that drops to 96 degrees by the end of the month. In October, the average temperature drops from 95 degrees at the beginning of the month to 83 degrees by Halloween. By the end of November, normal temperatures will be 70 degrees.

Here’s the weather you can expect in metro Phoenix

A behind-the-scenes look at how the Phoenix Zoo protects its animals from heat

Zookeepers Stevie Merner and Ryan Vittetoe talk about keeping the great one-horned rhino and the hornbill, a tropical bird, cool during the summer.

After the hottest summer on record, last week’s highs in the 90s were a welcome, if temporary, reprieve. But the National Weather Service is predicting daily highs of more than 110 degrees through Sunday during an unexpected fall heat wave.

“We have a really abnormally strong high-pressure system overhead,” said Katherine Berislavich, meteorologist for the National Weather Service Phoenix. “It is currently centered just east over Colorado, but the center of that system will migrate westward and overhead again late this week and into the weekend.”

A high-pressure system, also called a heat dome, is created when air descends from the atmosphere and is compressed toward the ground. As the air descends, it becomes hotter, suffocating the clouds and increasing sun exposure.

Berislavich expects the highest temperatures from the high-pressure system to reach Phoenix on Friday and Saturday.

Next week it will cool off a bit, but will still reach triple digit temperatures. The start of the week will remain around 110 degrees, but should decrease as the week progresses.

Average temperatures for Phoenix

As metro Phoenix slowly moves into fall, here are the average high and low temperatures you can expect for the rest of the year, according to US Climate Data.

• September: Average high temperature of 100 degrees, average low temperature of 77 degrees.
• October: Average high temperature of 89 degrees, average low temperature of 65 degrees.
• November: Average high temperature of 76 degrees, average low temperature of 53 degrees.
• December: Average high temperature of 66 degrees, average low temperature of 45 degrees.