Western Australia has baked in some of the hottest October weather on record as maximums today soared into the high thirties. A deep west coast trough helped wrench some tropical heat south on a conveyor belt of northeasterly winds. With clear skies and sea breeze defeating northeasterly winds, Perth hit a sweltering 37 degrees. That's 15 above average and one of the hottest October days since records began at the current site in 1994. At the airport, also 37 degrees, it will go down as the hottest October day in 48 years. Temperatures right across the south and particularly southwest ranged between 10 and 17 degrees above average. Some other notable October records that fell are: - Lancelin (Lower West), 39 degrees, a 44 year record. - Jarrahwood (Southwest), 34 degrees, a 34 year record. The unusual October 'heatwave' will be fairly short lived. A southwesterly change is knocking at the door of Perth and will break through during the late afternoon and early evening. The change will drop temperatures, although it will also lift humidity. The latter here could make for a rather uncomfortable nights sleep. A cooler, but humid Sunday will lead into a cooler week ahead.