I can’t tell you for sure what the weather is like at this moment but having just been there last month, I can attest to the fact that temperatures range quite a bit! With that being said, i am sure you will have a great trip! The beauty is truly breathtaking!
At REI, we believe time outside is fundamental to a life well lived.
That appears to be a nighttime temp, so I'm sure it's accurate. It gets pretty cold at night, but I hear it's incredible for hiking and other outdoor activities in the summer. I've been to Banff for skiing, so it was closer to 0 degrees overnight when I was there.