It's going to be a great last official weekend of summer. Highs will be in the 80s up north, and 90s down south, with abundant sunshine. There is a Red Flag Warning for the Wasatch Back and southwest Wyoming for dangerous fire conditions. The wind will pick up, and the humidity will drop, so just be careful if you're camping and having a fire.
A weak front will move through late on Sunday, which will bring a few clouds, cooler temps, and a stray thunderstorm over the Uintas. Next week, a northwest flow will be very persistent. This will keep Utah dry, with seasonable temperatures in the 70s and 80s for highs. This pattern will hold for nearly the rest of September, making for beautiful late summer and early fall conditions. The first day of fall is next Saturday.
Have a great weekend~!