A firefighter has died while battling an enormous wildfire in northern California, authorities said late on Monday.

Temperatures on Thursday reached 35.1 degrees Celsius at Wisley, in Surrey, southern England, officially making it the hottest day of the year so far.

In the week to Sunday at least 65 people died of heat stroke while 22,647 people were hospitalised, the Fire and Disaster Management Agency said.

Officials said last week that the heatwave in Japan had killed at least 15 people and forced the hospitalisation of over 12,000 others in the first two weeks of July.

In Sweden, where temperatures are the highest for a century, farmers are even sending their animals to slaughter.

Temperatures have risen since Monday night and the cooling winds from the Arabian Sea have stopped.

Different parts of the country experienced hot conditions on Saturday with southerly fresh to strong winds causing blowing dust and low visibility, which dropped to below 3km in some areas.

The weather office said northwesterly fresh to strong winds are expected to affect the country from Friday night until Tuesday.

Two people were found dead in Romania as snow and sub-zero temperatures across much of Europe saw flights cancelled, road and rail transport disrupted and schools closed on Tuesday.

The Qatar Met department issued several posts on its social media channels on Wednesday, advising people to be cautious and providing regular updates on the emerging situation.

Other places that recorded high temperatures on Tuesday were Abu Samra - 37C (up by 6C from Monday’s 31C), Jumayliyah - 37C (up by 7C from Monday’s 30C).

HMC's Dr Rafael Consunji explained that electrical burns and fires are more likely to happen with the incorrect use of electrical appliances for heating, while scald burns most often happen when bathing or cooking with hot liquids.