Hot, dry, dusty winds have been blowing across much of South Australia during Sunday due to a low pressure trough deepening ahead of a gusty, mainly dry cooler change.

Some of the state has had its hottest day since last summer and hottest for this early in the season in decades.

This has been the hottest November day in more than 70 years at Oodnadatta, reaching 47.4 degrees, just shy of the state record for November, 47.9 degrees at Tarcoola in 1993. Woomera's 45.2-degree maximum was also the hottest it has been in November in more than 70 years.

Sunday was the hottest November day in 14 years at Coober Pedy (45.0 degrees), six years for Marree (45.3 degrees), Roxby Downs (45.2) and Moomba (44.6) and five years for Port Augusta (45.2).

Woomera (45.2 degrees), Port Augusta (45.2), Whyalla (43.5), Roseworthy (41.6), Leigh Creek (41.5) Snowtown (41.5), Yunta (41.4), Port Pirie (41.2) and Murray Bridge (40.3), all had their first 40-degree day since last summer.

Adelaide reached 38.1 degrees, the city's second 38-degree day this month.

Temperature observations, satellite, radar, GFS synoptic pattern and lightning just before 4pm Sunday

Thankfully, these hot, dry, dusty winds are only brief. A front is due to bring a significant cooling later today in the south and tomorrow in the north, increasing humidity and reducing fire danger. This change has aleady cooled parts of Yorke and Eyre peninsulas by 10-13 degrees this afternoon. The change should reach Adelaide before sunset, likely cooling the city rapidly, to the mid twenties by tea time and below 20 degrees later in the evening.

Earlier in the day, fire danger had reached the Catastrophic category in the north of the state and Extreme in parts of the south. It was the most intense November fire weather in 11 years for Yunta and Coonawarra.