Temperatures are set to soar again in Perth after a slight reprieve. Over the past few weeks Perth has sweltered with most days rising into the 30's. Yesterday was Perth's coolest day in almost two weeks, reaching 29 degrees. Many residents have noticed that the weekends have been the hottest part of the week over the past month. Last weekend saw the mercury climb to 38 degrees on both days. It's been four weeks since a day on the weekend failed to reach 30 degrees. This weekend is set to be just as hot with a current forecast of 38 and 39 degrees. Many people will take to the beaches or stay indoors with air conditioning to stay cool. The reason why heat continues to peak on the weekend is that troughs continue to cross Perth one week apart on either late Sunday or during Monday. From Monday temperatures will gradually be lower each day as the airmass cools and then a trough crosses on Tuesday or Wednesday bringing the risk of showers and storms. Heat is then likely to build again into the next weekend, which once again looks hot.