Get set for a warm stretch of hot weather in Adelaide Adelaide is set to endure one of its longest ever stretches of days over 30 degrees. ADELAIDE is set to bake for another seven days as the state faces its third-longest run of days over 30C in 127 years. Our longest consecutive run of days over 30C was 13 in 1934 and 16 in 2008. The Bureau of Meteorology this morning said the cause for the warmer weather is a high in the Tasman sea, which is directing a northeasterly flow over South Australia. Latest weather, forecasts Warmer northeasterly winds and a low pressure trough, which is very slow-moving from the west, is also resulting in a warm northerly flow of air into South Australia. But for those sick of the heat, Adelaide is looking at a cooler than usual autumn, according to the Bureau of Meteorology's seasonal outlook.