The cooler temperatures and rain will affect morning commutes across Southern New England, including Boston, where umbrellas will be necessary. While rainfall rates may be heavy in some areas, flooding risks are minimal. Higher humidity levels will make the air feel muggy, particularly along the coast. The stalled frontal boundary will persist, bringing additional chances for rain throughout the week, including potential widespread showers on Thursday. Residents should prepare for soggy conditions leading into the Labor Day weekend.