Heatwave conditions are expected to return to many parts of the United Kingdom next week, with temperatures potentially reaching 35 degrees Celsius (95 degrees Fahrenheit). This forecast comes after a period of cooler weather that brought maximum temperatures down to 20-24C for much of England and Wales, effectively ending the third heatwave of the year for most areas.
Two locations, Usk and Exeter, had managed to sustain heatwave criteria for 20 consecutive days, the longest stretch recorded this year. However, these local heatwaves are likely to conclude over the weekend as temperatures drop further and some rain is expected in parts of the UK.
This break in the heat may be short-lived. Forecasters anticipate high pressure building south of the UK next week, which could cause rain-bearing weather fronts to stall. Consequently, any precipitation is likely to be confined to northern and western regions, particularly north-west Scotland. Meanwhile, southern areas of the UK are expected to see temperatures climb again.
According to the Met Office, a formal heatwave declaration requires more than just one or two isolated locations reaching specific temperature thresholds. The definition of a heatwave means that while high temperatures are anticipated, the conditions may not meet the official criteria across a widespread area to be classified as such.
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The recent period of mainly dry weather is giving way to some rainfall this weekend, though the amount is expected to be limited. This will be followed by the potential for a fourth heatwave of the year, with a return to significantly warmer conditions, especially in the southern parts of the country. The build-up of high pressure is a key factor in this expected shift in weather patterns, concentrating warmer air over the UK while pushing wetter systems to the north and west.