Parts of SA have had its hottest day since March as temperatures soared. Adelaide heated past 33 degrees today for the first time since March, reaching 34 degrees by the early afternoon. Elsewhere, temperatures have already climbed 12 degrees above average in Ceduna, 37 degrees, and 10 degrees above average in Parafield, 35 degrees. Today's heat is due to gusty northwesterlies ahead of trough, which are drawing a hot airmass from the nation's interior into the southern state. Looking ahead, the warmth isn't expected to last long. The trough will cross the city of churches this evening, bringing a gusty southerly change and rain, followed by a cooler airmass. Behind the change, Adelaide will only reach about 23 degrees tomorrow, more than 10 degrees colder than today.