Saturday is Halloween day, and it will, unfornuately, be the coolest day of the next five days. An upper trough will swing through southern Alberta, and draw down some cool air from the north. Temperatures will be below average, and at trick or treating time, you can expect a temperautre of 5 or 6 degrees. Cool, but not bitterly cold. Much warmer weather returns for the rest of the week, as an upper ridge builds in, boosting temperatures to the teens.
Friday night: Partly cloudy, low -4 Saturday: Mainly sunny, high 6 Sunday: Sunny, high 15 Monday: Sunny, high 14 Tuesday: Partly cloudy, high 13 Wednesday: Partly cloudy, slight chance of a shower, high 11