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People are being encouraged to look out for the vulnerable and elderly as temperatures are predicted to hit highs of 33C (91F) in parts of the UK - warmer than Athens and Ibiza, BBC News reports.

Met Office forecaster Greg Dewhurst said it could possibly be "the hottest day of the year so far" on Monday.

Monday's heat-health alerts will remain in place until Friday.

The east and south of England will see an amber level three alert, with the rest of England on a level two alert.

Heatwaves are becoming more likely and more extreme because of climate change.

As temperatures rise, parents are being advised to limit their children's exposure to sun.

Mr Dewhurst said central, southern and eastern parts of England could "possibly see maximum highs of 33C", but for most it will be dry and sunny - and "well into the high 20s from the morning".

"So it's very possible tomorrow will be the hottest day of the year so far, it will certainly be on par with the existing record, maybe more."

The forecaster also warned temperatures could remain high overnight going into Tuesday - "remaining in the low 20s in cities, so many may experience an uncomfortable night".

The UK's highest temperature so far this year was 32.7C - recorded at London's Heathrow Airport on 17 June.

Dr Agostinho Sousa from the UK Health Security Agency (UKHSA) has urged people stay hydrated and try to find shade when the rays are strongest between 11:00 and 15:00 BST.

The agency said the elderly, people with underlying health conditions and those who live alone are particularly at risk.

It suggests people shade or cover windows exposed to direct sunlight, check fans and fridges are working properly, and that medicines are correctly stored.