Tuolumne Meadows Campgrounds is closed for the season.

We did have snow flurries in Canada during the month of September. But nothing major. You should expect night-time temps in the 20s -- great sleeping weather.

Of course, your mileage may vary -- there can be major storms during late September.

Note that the altitude in the Canadian Rockies is much lower than in the High Sierra. So yes, the seasons are different, but it's not the Arctic.

Until January. Then it's the Arctic.