The warmest air in nearly six months will return to the Desert Southwest to kick off the week.
A large ridge of high pressure will dominate the Southwest leading to a hot, dry air mass.
![](https://media.weathernationtv.com/app/uploads/2019/04/Capture-3-728x408.jpg)
Temperatures are expected to soar into the 80s on Sunday. In fact, Phoenix may go for a run at 90 degrees. This is just the beginning of the warm up.
![](https://media.weathernationtv.com/app/uploads/2019/04/Capture2-1-728x408.jpg)
Phoenix hasn't touched 90 degrees since October 28, 2018 and the last 100 degree day occurred last September 29. However, Phoenix may nudge the century mark on Monday and Tuesday.
![](https://media.weathernationtv.com/app/uploads/2019/04/Capture7-1-728x408.jpg)
High temperatures are expected to climb well into the 90s for southwestern Arizona and southeastern California on Monday. Las Vegas may even clip 90 degrees.
![](https://media.weathernationtv.com/app/uploads/2019/04/Capture4-1-728x408.jpg)
Phoenix will likely see high temperatures near 100 degrees both on Monday and Tuesday before cooling off through the week.
![](https://media.weathernationtv.com/app/uploads/2019/04/Capture6-1-728x408.jpg)
The heat doesn't stick around long for the Desert Southwest but it's the first glimpse of the extreme heat that may lurk around the corner.
![](https://media.weathernationtv.com/app/uploads/2019/04/Capture8-1-728x408.jpg)
For WeatherNation: Meteorologist Nick Merianos