Doesn't work on IOS as I checked on my iPhone 7 plus.
It works here in Malaysia.
Works for me in Canada: https://drive.google.com/file/d/0B_T5OZNPoDWAdEZxV0gycUNUcXc/view?usp=drivesdk
However, since it's night time there's not much traffic.
But Maps has another new feature in Beta. If you try to get directions to some place with Public Transit, then there will be a new icon with the weather and temperature. If you click on it, then you'll have the weather from where you go.
If Apple iOS and Windows Phone map applications don't do this, they might as well follow suit.