The name itself is an Anglicisation that likely preserves an older Irish term related to a fortified enclosure, and sitting somewhere within its boundaries is exactly that: a rath, the kind of circular earthwork that was once the most common form of settlement across early medieval Ireland. Raths, sometimes called ringforts, were typically built between roughly 500 and 1000 AD, their raised earthen banks enclosing a farmstead and offering a degree of protection for people and livestock alike. Tens of thousands once existed across the island; a significant number survive, though many have been ploughed out or built over across the centuries.

What makes the Weatherfort example quietly interesting is partly the coincidence of its location and its placename. Mayo is rich in these structures, scattered across its drumlin fields and boggy uplands, but a ringfort sitting in a townland whose very name appears to echo the idea of a fort or enclosure has a certain archaeological tidiness to it. Placename evidence of this kind is sometimes the oldest surviving record of a monument's presence, outlasting the physical remains themselves when the earthworks have been reduced to little more than a cropmark or a slight rise in a field.