Much of southern Australia can look forward to a balmy weekend and mostly sunny skies, with some places likely to see their warmest April weekend in almost a decade. A series of high pressure systems and a lack of significant cold fronts has allowed warmth to build over the past few days. This warmth is likely to peak over South Australia and Victoria over the weekend ahead of a weak trough, with temperatures likely to be up to 10 degrees above average for April. In SA, Adelaide can look forward to an average maximum of 29 degrees this weekend, which would be its warmest weekend in a month and its warmest April weekend in almost a decade. Port Augusta can also look forward to a balmy weekend, with an average high of 31 degrees. In Victoria it will not be as warm as SA, however the state can still look forward to a cozy weekend. Melbourne should see an average maximum of 27 degrees, its warmest April weekend in three years. Hamilton in the state's southwest will see an average high of 28 degrees, its warmest April weekend in eight years. Looking further ahead, the warm conditions are likely to persist into the new week in SA, as a slow-moving high moves through the Bight. In Victoria, it will be briefly cooler on Monday in the wake of the trough before heat builds again from Tuesday, with a significant cool change not likely until later next week.