Southern parts of South Australia and western Victoria are being soaked by their heaviest April rain in several years with widespread 15-to-40 millimetres falling across the region overnight. Stenhouse Bay has had its heaviest April rain in at east 18 years, picking up 32mm since 9am yesterday. This is also the on southern Yorke Peninsula town's biggest rain since winter 2012. Nearby, Edithburgh and Minlaton gained a bit over 20mm each, their heaviest April rain in seven years. In SA's southeast, Robe and Coonawarra received 32 and 26mm respectively, their biggest April rain in 14 years. Just across the border it has been the heaviest April rain in seven years for Edenhope, Casterton and Kanagulk with 19mm, 22mm and 18mm respectively. A low pressure trough has connected with moisture from the Indian and Southern oceans to send a north-west cloud band across the region, delivering widespread rain at a crucial time of the year. Soil moisture is becoming primed for winter crops and dams are being filled, great news for many farmers. This trough will take the rain further east across SA and Victoria during the day. Rain has already started to clear west from Yorke Peninsula. Another round of decent rain will arrive as early as Thursday night and Friday when a front and cold pool of air crosses the region, although falls will generally be lighter than the most recent rain. It will however, keep the ground sodden for a few more days before a high pressure system dries things out next week. Farm machinery along with this weekend's footballers will find it tough going in the mud.