In August, gutters aren't a thought, but September rains make them an issue. If your gutters aren't draining quickly and drip long after the drizzle fizzles, water may well be collecting in a low spot caused by sagging. If that's the case, grab a helper and snap a chalk line along the gutter using both ends of its top edge as your guiding points. (You should have a slope of 1 inch for every 16 feet of gutter). Look for spots where the gutter's edge falls below the chalk line, then refasten the spikes, straps or brackets that hold it in place to get it back in line.