In hot weather I sweat like crazy and a daily cleaning is mandatory, once the temps drop below 70 I hardly seem to sweat at all even after a good exertion. At 65 I can ride a bike down a rail trail for hours at a brisk pace and loaded and barely sweat, partly because I also don't get cold easily and will still be wearing shorts and a t-shirt till it gets into the 40s. At that point I can go a few days between showers with no real worries or noticeable smell. The one caveat, I carry sanitary wipes/wet wipes for bio-breaks, but I especially do that for summer touring as well.