It will be a wonderful weekend for Perth, but a big change is just around the corner. With the mercury set to hit the high 20's on both Saturday and Sunday, it will be a wonderful time to head outdoors. By Sunday evening, a cold front will be preparing to pass over, bringing with a few showers as winds tend onshore. Showers and the rumble of thunder will accompany much of Monday as the front sweeps over. In its wake it will leave much cooler conditions. Daytime temperatures will struggle to reach the low 20’s under cloudy skies. A second system passing close behind will bring another blast of cold air, with further showers and brisk winds on Tuesday. By Wednesday the rain will have passed, but the pool of cold air will linger. Mornings will drop into the single figures, making it difficult for the early-risers. With a current forecast of 18 degrees, Wednesday also could be the coldest April day since 2010. So before the weather turns, make the most of the sunshine and warmth this weekend.