It won’t be as warm for the weekend.
Late-day rain and even wet snow are on the way for Saturday.
The rain should arrive in Calgary close to 4 p.m. (two to four millimetres possible), then it will switch to snow as temperatures drop fast (one centimetre expected).

The weather will be brighter and drier on Sunday, but not warmer.
Warmer temperatures in the teens return on Monday.

Here is a photo from Ulla Kalny of Mount Yamnuska on Friday afternoon:

Stunning!