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When the UK experiences a heatwave, it can cause more than just discomfort; it can raise real concerns for those working indoors or outside in soaring temperatures. But what exactly are your rights when it gets too hot to work? Here’s what UK law says, what employers should do, and what you can do if you’re struggling in the heat.

Is There a Maximum Legal Working Temperature in the UK?

Surprisingly, there’s no legal maximum working temperature set by UK law. While regulations state that workplace temperatures should be “reasonable”, the law doesn’t define what “too hot” actually means.

The Health and Safety Executive (HSE), the body that enforces workplace health and safety, says that employers have a duty to maintain a comfortable and safe environment, but leaves it open to interpretation based on the type of work and environment.

What Does “Reasonable” Mean?

The term “reasonable” depends on several factors:

  • The type of work being done (e.g. office work vs. manual labour)
  • The environment (indoors, outdoors, kitchens, warehouses)
  • The level of physical effort required
  • The use of uniforms or protective clothing

While office workers might start to struggle once indoor temperatures rise above 30°C, for manual workers or those outside, the threshold for concern might be lower due to added physical strain.

Employer Responsibilities in Hot Weather

Even though there’s no set maximum temperature, employers must still follow health and safety laws, including:

  • Conducting risk assessments that include temperature-related risks
  • Taking steps to reduce heat-related risks, such as:
    • Providing fans or portable air conditioning
    • Offering extra breaks and access to water
    • Adjusting dress codes where possible
    • Allowing flexible hours to avoid working during the hottest part of the day
    • For outdoor workers, providing shaded areas or rotating tasks

If these measures aren’t taken, employers could be putting staff at risk of heat exhaustion or heatstroke, which are serious health conditions.

What If You Feel Unwell Due to the Heat?

If you’re feeling ill or unable to work due to the heat, speak to your manager or HR team straight away. Signs of heat-related illness include:

  • Dizziness
  • Headaches
  • Excessive sweating
  • Nausea or vomiting
  • Confusion or difficulty concentrating

You should not be forced to carry on working in conditions that are affecting your health. Employers are legally required to take your concerns seriously.

What Can Employees Do?

If you think your workplace is too hot to work safely:

  1. Raise it informally: Speak to your manager about adjusting working conditions or hours.
  2. Check your policies: Your employer may already have a heat policy in place.
  3. Talk to your health & safety rep: If you’re in a union, they can support you.
  4. Make a formal complaint: If informal steps fail, follow your company’s grievance procedure.
  5. Contact the HSE or ACAS: If nothing changes and you feel unsafe, you can report concerns.

What About Outdoor Workers?

Outdoor workers are particularly vulnerable. Employers should:

  • Schedule strenuous tasks for cooler times
  • Ensure access to drinking water
  • Provide sun protection (e.g. hats, sunscreen)
  • Educate workers on the signs of heat-related illness

Tips for Staying Cool at Work

Whether your workplace is an office, warehouse, or building site, here are some practical ways to cope with the heat:

  • Stay hydrated – drink water regularly
  • Wear light, breathable clothing if possible
  • Take regular short breaks
  • Avoid caffeine or heavy meals
  • Use fans or open windows to improve airflow
  • Speak up if you’re feeling unwell

Final Thoughts

Heatwaves in the UK are becoming more frequent, and both employers and employees must understand their responsibilities and rights. While there’s no official legal limit for workplace temperature, employers still have a duty of care to keep conditions safe and reasonable.

If you’re too hot to work, don’t suffer in silence. Raise your concerns, know your rights, and prioritise your health. No job is worth risking your well-being over.

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