The chief medical officer has extended a heat alert in effect in Hungary since Monday until next Monday at midnight.
Young children, the elderly and those with cardiovascular diseases must take particular precautions, the national health and disaster management authorities said in a statement.
The heat alert comes with advice to drink plenty, avoid the sun between 11am and 3pm and to use skin protection.
The weather service said on Facebook that a cold front is expected to arrive late on Friday but its effect will be felt only in western Hungary.
Read alsoRecord-high temperatures in Hungary, some water shortages
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