It’s been a very long time since we saw a forecast here, so I’m happy to be bringing this one to you, even if the Southwest doesn’t always have the most dynamic weather.

At 953PM, MT, Tucson was reporting clear skies and a temperature of 47 degrees. A cut off low sits over the southwestern US, allowing for the pocket of chilly air in the region, and evidenced by an elevated cold front visible on satellite over western Nevada.
The cut off low projects to be quite impactful for the middle of the country late next week, but for the remainder of the weekend into Monday, it will sag back over the ocean as it drifts to the south southwest. Moderately chilly temperatures with generally clear skies will continue in Tucson.
Tomorrow – Mostly sunny, High 73, Low 40
Monday – Fair skies, High 75, Low 40

TWC: Tomorrow – Mainly sunny. High 74, Low 42
Monday – Except for a few afternoon clouds, mainly sunny High 76, Low 45

AW: Tomorrow – Plenty of sun High 73, Low 42
Monday – Partly sunny and warm High 75, Low 45

NWS: Tomorrow – Sunny, High 73, Low 47
Monday – Mostly sunny, High 75, Low 41

WB: Tomorrow – Mostly sunny, High 72, Low 40
Monday – Partly cloudy, High 73, Low 44

WN: Tomorrow – Sunny, High 73, Low 37
Monday – Mostly sunny, High 75, Low 41

FIO: Tomorrow – Clear throughout the day. High 73, Low 38
Monday – Partly cloudy throughout the day. High 76, Low 38

Here is the satellite of the southwest tonight. Note the wispy cold front in western Nevada.