The United Kingdom is on the cusp of experiencing its hottest May day on record on Monday, as extreme heat conditions persist across the nation. Forecasters predict temperatures could climb as high as 34C, potentially shattering the previous record of 32.8C, which was set over 80 years ago.

This intense heatwave follows a weekend where temperatures already reached significant highs. On Sunday, 32.3C was recorded in Kew Gardens, south-west London, marking the highest temperature of the year so far. This peak occurred as eight regions in southern and eastern England officially entered heatwave conditions, having recorded three consecutive days at or above the designated threshold.

In response to the rising temperatures, amber heat health alerts are currently in effect for parts of the Midlands and eastern England, expected to continue until at least Wednesday. These alerts are designed to raise awareness and provide guidance on managing the health risks associated with prolonged hot weather.

Monday and Tuesday are anticipated to be the warmest days of the current spell, with temperatures in southern Britain expected to reach the mid-30s Celsius. Monday, in particular, is forecast to bring the most widespread heat, with all constituent nations of the UK set to experience their hottest weather of the year to date. Wales is also at risk of setting a new May heat record, with the possibility of exceeding the 30.6C recorded in Newport in 1944.

Beyond daytime highs, overnight temperatures are also under scrutiny. There is a possibility that Monday or Tuesday night could see minimum temperatures remain above the existing May record of 18.9C, set in Folkestone in 1947, indicating a sustained period of warmth. While localized thunderstorms may occur in central England and Wales on Tuesday, they are not expected to provide significant relief from the heat.

By Wednesday, a shift is expected for much of eastern and southeastern England, as cooler air from the North Sea offers a temporary respite, potentially causing a drop of five to 10 degrees Celsius. However, Wales and southwestern England are likely to remain warm, with temperatures still potentially reaching 30C, as they are less affected by the sea breeze.

The heat is projected to return by Thursday, with hot air resurging from France, pushing temperatures back towards the 30C mark. Most weather models indicate that a more substantial and widespread break from the heat will begin towards the end of next week and into the first week of June. This change is attributed to the jet stream shifting southwards, bringing low pressure systems, rain, stronger winds, and a general temperature decrease.

This prolonged period of hot weather is consistent with trends observed in a changing, hotter climate. Europe is identified as the world's fastest-warming continent, with heatwaves becoming increasingly frequent and intense. Reaching mid-30s Celsius in May is statistically unusual for the UK, where such temperatures were once uncommon even in mid-summer.