As the UK braces for soaring temperatures of up to 35°C this week, workplace advisory body Acas is calling on employers to take steps to help staff stay safe, comfortable and productive in the heat.
The body has published guidance to help organisations manage the practical and wellbeing challenges posed by extreme weather, with a focus on maintaining both morale and output.
“The sizzling weather may be ideal for the beach but staff getting into work during one of the hottest weeks of the year may not feel the same way,” said Acas Chief Executive Niall Mackenzie.
“Some employees with certain health conditions or disabilities may be adversely affected by the extreme heat. The heat can also impact public transport too which can affect employees commuting into work,” he said.
Sleep and Concentration Take a Hit
An Acas poll found that 47% of respondents said poor sleep during hot weather negatively affected their work. A further 22% cited overheated offices as their biggest challenge, while 21% struggled to stay focused during a heatwave.
For those already grappling with post-pandemic hybrid schedules or trying to manage heavy workloads before summer breaks, the added strain of extreme heat can tip the balance.
Five key ways employers can support staff:
- Monitor temperature and comfort
Although there is no legal maximum working temperature, employers must ensure workplace conditions are “reasonable” under Health and Safety Executive (HSE) rules. Staff should be encouraged to raise concerns and employers can refer to HSE guidance on thermal comfort to assess and respond. - Cool down the work environment
Simple adjustments such as using fans or air conditioning, drawing blinds to block out direct sunlight, and limiting the use of heat-generating equipment can help. Outdoor workers should be provided with sun protection and suitable clothing. - Encourage hydration and breaks
Employers are legally required to provide drinking water at work. Staff should be reminded to drink regularly and, where possible, given extra breaks to hydrate and cool down. Offering cold refreshments or chilled water stations can be a morale booster. - Consider flexible dress codes
While there’s no legal requirement to relax uniforms, Acas suggests that allowing staff to dress more casually – such as not requiring ties or full suits – can be a pragmatic response in extreme heat. Clear communication is key to balancing comfort with professionalism. - Prepare for travel disruption
High temperatures can affect public transport, and can delay commutes. Acas recommends employers show flexibility by, for example, adjusting start times or allowing remote work where feasible.
Prioritising Vulnerable Workers
Staff with health conditions or disabilities may be at greater risk during hot spells. Employers have a legal duty to make reasonable adjustments, which might include providing fans or air coolers, moving workstations, or allowing more frequent breaks.
Acas encourages managers to talk to staff individually about what support they need, referring to its advice on reasonable adjustments and extreme temperatures in the workplace.
With more hot spells likely in future, employers are encouraged to treat extreme weather planning as part of their broader wellbeing strategy, not just a seasonal afterthought. A proactive and inclusive approach can help keep staff safe, engaged and productive, whatever the weather.