Adelaide residents have endured their 10th 40-degree day this summer, with the city reaching 44.7 degrees on Sunday afternoon, the city's sixth hottest day on record. Sunday's 44.7 degree maximum is 15 degrees above average and a new February record, beating the previous record of 44.3 degrees set in 2004. Elsewhere in South Australia on Sunday it exceeded 40 degrees in all districts for the second day running including Kangaroo Island as dry northerly winds developed ahead of a front. It got as hot as 46.5 degrees in Keith in the state's South East, its fourth 45-degree day this summer. Cummins on Lower Eyre Peninsula got to 46.2 degrees, its hottest day in at least seven years. South Australian residents including those in Adelaide will be eagerly awaiting the cooler change, particularly given they have put up with back-to-back 40-degree days. With the city reaching 43.4 degrees on Saturday it also makes it the hottest weekend on record. The previous hottest weekend in the city was in February 1899 when it reached 43.1 degrees on both Saturday the 11th and Sunday the 12th. The cooler change is due early this evening, although those in beach suburbs will experience some cooling later this afternoon. A southwesterly wind change should drop the temperature in the city to the low thirties from about 9pm. However, it will be another uncomfortable night for sleeping with the city only cooling below 25 degrees by about 3am. Last night was exceptionally warm, staying above 30 degrees all night. The change will be a mainly dry change, bringing only the odd thundery showers, mainly to the hills and ranges. However, the change will be strong enough for Monday to only reach the high twenties, at least 15 degrees cooler than Sunday and the coolest day in a week-and-a-half. Monday will almost certainly be the only day in the next week which fails to reach 30 degrees. It will heat up to the mid thirties as early as Wednesday and the temperature should peak at near 40 degrees next Saturday just ahead of another cooler change. Next Saturday could be Adelaide's 11th 40-degrees this summer which would equal the summer record, set in it 1897/1898.