State Emergency Services (SES) chief officer Chris Beattie says daily maximums have been forecast to escalate throughout the weekend.
The SES has issued an indefinite extreme heat warning and extra crews are on alert.
If today's temperatures reach 40C, Adelaide is set to experience it's hottest January in since 1908.
The Bureau of Meteorology revised its forecasts for Adelaide to allow for cooling to about 30C on Monday, but the city is facing at least five days during next week with temperatures above 40C.
The city sweltered through a heatwave earlier in January when the mercury was higher than 40C for five consecutive days.
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