The UK is bracing for a 'mini heatwave' this week, with temperatures forecasted to reach 20°C by Thursday, especially in the East and Southeast regions. Following a weekend of heavy rainfall, including 43mm in parts of the Scottish Highlands, the weather will shift to drier and sunnier conditions. Meteorologist Nick Finnis from NetWeather indicated that Thursday will be particularly bright, with only isolated light showers expected. The Metdesk team anticipates that areas like Norfolk, Suffolk, Essex, and Greater London will see the highest temperatures. However, some regions, including Northern Ireland and the Northwest of England, may still experience thundery weather due to lingering downpours. The Met Office has noted that temperatures will remain above average, with dry conditions expected to persist into next week. This rise in temperature poses potential challenges for the 16 million hay fever sufferers in the UK, prompting health professionals to recommend additional treatments alongside traditional antihistamines.