Australia Day events are being cancelled in Adelaide as the city braces for another spell of hot weather, a week after the Tour Down Under had to be altered to accommodate extreme temperatures.

Friday's forecast of 38 degrees Celsius has prompted several local councils to reschedule family and children's events, while wineries participating in the Adelaide Hills Crush Festival have cancelled about a third of 50 planned events.

The wine region celebration runs throughout the long weekend but will be suppressed by an even hotter 42C forecast for both Saturday and Sunday.

Kevin Knight, the Mayor of City of Tea Tree Gully, told ABC Radio Adelaide that its Australia Day ceremony would still be held on Friday, but a children's slip and slide event had to be rescheduled for today.

The City of Charles Sturt Council postponed Friday's Movies Under The Stars event, while the City of West Torrens cancelled its All Together Now festival.

An Australia Day Family Picnic scheduled by the City of Salisbury has also been scrapped.

People will be doing their best to keep cool on Australia Day but are warned to be sun smart as well. ( flickr: Nina Matthews )

Bureau of Meteorology senior forecaster Tom Boeck said the hot weather was on track to arrive as expected.

"The good news is there is a change expected to be developing Sunday night," he said.

"It's a significant change in terms of dropping the temperature. We're looking at a maximum of just 24C on Monday, which will be a nice change."

People planning on attending events have been advised to keep checking if they're going ahead.

Australia Day cricket to be a scorcher

The hot weather has not changed the minds of tens of thousands of people expected to attend the one-day international cricket match between Australia and England at Adelaide Oval.

"It's going to be hot, but it's summer sport and I'm sure people coming along will equip themselves accordingly," the Stadium Management Authority's Darren Chandler said.

"Everyone's got to be smart about it and find shade where they can. There's plenty of concourse areas people can retreat to in between overs."

Australia will be looking to reclaim some honour after losing three ODI games in a row to England. ( AAP: Dave Hunt )

He said all the grandstands had been installed with fans, while St John Ambulance Service and Red Frogs volunteers would be in the crowd.

"They are out and about in the crowd giving out free water, sunscreen, and are looking for people who might be in distress," Mr Chandler said.

"Our staff are trained in that area as well.

"This is a day-night game as well, so half the game will be under lights."

As for the cricketers themselves, Mr Chandler said they were elite athletes who trained for such conditions and had appropriate breaks during hot weather.

"I'm not sure a cricket match [at this level] has ever been cancelled because of the heat," he said.