Brit of 50+ years here. Never once heard "hotting up" in respect of weather even on a TV weather report, though now I stick to radio and app for weather, as TV

Brit of 50+ years here. Never once heard "hotting up" in respect of weather even on a TV weather report, though now I stick to radio and app for weather, as TV weather dumbed down too far. Of competition, yes loads of times to the point of it being endemic. Then "heating up" or "warming up" would be used for both weather or competition. :) For hot weather I'd expect to hear "taps aff", "baking", "warm" (with a reasonable dose of default Brit sarcasm and Northern accent) or, if the red top media are involved, "heatwave" if the temperature rose briefly over 68F. Along with a few expressions that aren't so common any more like "cracking the flags" (warm enough to break paving flags) etc. Am I wrong too? ;) It may be regionally idiomatic, but I don't recall ever hearing it even during my years working in London.