Temperatures will soar and fire danger ratings could reach catastrophic levels across South Australia on Wednesday. 

Heat that has been building over Western Australia will make its way east over the next couple of days ahead of a low pressure trough and cold front, peaking on Wednesday. 

Temperatures in Adelaide are forecast to reach the low 40's, over 10 degrees above- average. Should the mercury exceed 43 degrees at Adelaide's Kent Town it would be the hottest November day on record at the site, beating the 43.0 degrees reached in 2009. 

Gusty northerly winds in conjunction with the heat and dry conditions have also lead to elevated fire danger ratings across the state. Catastrophic Fire Danger Ratings have been issued for Lower Eyre Peninsula, Yorke Peninsula, Mid North and Mount Lofty Ranges on Wednesday, with total fire bans in effect in each district. 

Both temperatures and fire danger ratings will drop as a southwesterly change pushes across the state from late Wednesday.