I don't go by Environment Canada (Fed govt. weather forecaster) weather forecasts, except for the.... right now, this time, this day temps/weather...and even then, they seem to be wrong a lot of the time.
I have found more success to check out what the weather is like in a city 500 miles west of us...Saskatoon.
Good chance what their weather is...is what our weather will be in a day and a half.
Or if I find my checking out the weather/ temp in Toon town (Saskatoon's 'pet' name) not accurate..... then it's the last resort....I revert to my old tried and true method...I stick my head outside.
This method is always spot on.