Emergency services will be on high alert on Friday as South Australia's Country Fire Service (CFS) warns it cannot remember a Christmas Day that has had such bad fire conditions forecast.

High temperatures are expected across South Australia for Friday with very strong winds sweeping through during the afternoon.

CFS state coordinator Leigh Miller, who has been in the CFS for 29 years, said the forecast weather meant there would likely be fire bans and fire weather warnings issued, potentially in 10 districts.

"I can't remember any [Christmas] day like this since I've been in CFS," Mr Miller said.

"It is going to be a hot day, it's going to be windy day and even if there aren't any fire bans it will still be a significant fire day with those types of conditions, so people need to think about their plans for Christmas.

"They also need to think about their bushfire survival plan, make sure they are up to date because there's going to be a change of circumstances for their family on that day."

He warned if total fire bans were issued, the use of solid-fuel cookers would be banned and people who were planning on using them should have an alternative for cooking the Christmas meal.

"You can still use a gas or electric barbecue – just make sure there is someone in attendance at all times," he said.

The official fire bans and fire danger ratings for Christmas Day will be announced after 4:00pm on Thursday.

This afternoon the CFS issued total fire bans with a danger rating of severe for Christmas Eve in the West Coast, Eastern Eyre Peninsula and Lower South East districts.

Temperatures up to 40C expected across SA

The Bureau of Meteorology said Christmas Day would see the state reach temperatures of high 30s or low 40s with northerly winds.

Sorry, this video has expired An increased fire risk predicted for Christmas Day due to high temperatures and strong winds

Acting regional director John Nairn said Adelaide was heading for a top of 37 degrees Celsius, with a change expected late in the afternoon.

He said the east and south-east of the state would face particularly bad fire weather conditions.

"It's going to be in the east where we are going to see the higher winds during the day, in those northerly winds," he said.

"So that's probably where we're going to see, particularly the south-east, where we're going to see the higher fire dangers.

"Despite the cooler temperatures arriving with the change later in the day, the strength of its strong south to southwest winds will still pose a fire weather threat."

Emergency service personnel will be on high alert throughout the day, with additional crews on standby.