The forecast for the next month of Canada's summer has just landed, and Ontario is in for some scorching temperatures that will be hottest along parts of its southern border. The lower halves of Alberta and Saskatchewan — including around Edmonton and Regina — are in for a scorching few weeks, along with a sliver of northwestern Ontario near Thunder Bay and Sault Ste. Marie, and southern Ontario near Windsor. Environment Canada's latest extended forecast, too, shows a high probability of hotter-than-average conditions throughout Ontario between July and September, especially in the centre of the province. As far as the GTA, this far out, it's hard to tell, as summer storms tend to be unpredictable and quite all over the place.