Perth has been incredibly dry so far this winter, but rain is coming on Tuesday and Thursday. The western capital has only picked up 10mm or more on two occasions so far during winter due to a dominance of high pressure. The high pressure systems have weakened most approaching fronts, leading to the second driest June in over 130 years of records. The last front to move through only brought 5mm by Thursday morning, however rain is on its way. A strong cold front is building in the west and will arrive on Tuesday, bringing a hearty fall of 5-10mm to Perth and surrounding areas. The southwest corner looks like it will do quite well with 10-20mm. Wednesday will then be dry. On Thursday another front will reach the southwest with the chance that a low pressure system will develop with it. If it is just a front then falls should be near 5mm in Perth. However, if a low forms as some models are suggesting, then it could bring 10-15mm on the southwest tip and areas of 5-10mm falls as far inland as the Great Southern. There is even the chance of good falls for the very dry Central Wheat Belt. As these systems approach make sure you keep an eye on weatherzone.com.au for updated forecasts.