The UK is experiencing a significant heatwave, with temperatures exceeding 30°C and health warnings issued by the UK Health and Security Agency. Although there are no legal temperature limits for working, employers are required to ensure a safe working environment, which includes maintaining comfortable temperatures and providing fresh air. Specific regulations apply to construction sites, mandating reasonable temperatures and protection from harsh weather. Heat stress poses serious health risks, including symptoms such as dizziness, fatigue, and potentially life-threatening conditions like heat stroke. The Health and Safety Executive emphasizes that workers should stay hydrated, recommending frequent small sips of water, approximately 250 ml every 15 minutes, to combat dehydration. Overall, while the heat presents challenges, both employers and employees must be proactive in managing health and safety during extreme weather conditions.