Working in Hot Weather: Keeping Your Team Safe and Hydrated

Why Hot Weather Is a Workplace Issue

When temperatures climb, work gets harder. Concentration drops, tempers fray, and the body has to work overtime just to keep cool. For people doing physical jobs, wearing protective equipment, or working outdoors in direct sun, a hot spell is not just uncomfortable, it is a genuine health risk. Heat exhaustion can develop quickly, and in serious cases it can progress to heat stroke, which is a medical emergency.

Employers sometimes assume there is nothing they can do about the weather. In reality, there is a great deal you can do, and the law expects you to do it.

What the Law Says About Temperature at Work

The Workplace (Health, Safety and Welfare) Regulations 1992 require the temperature inside workplaces to be reasonable. There is no maximum workplace temperature set in law, largely because what is reasonable depends on the work being done. A foundry and an office cannot sensibly share one limit. What matters is that you assess the risk and take sensible steps to control it, which is the general duty under the Health and Safety at Work etc. Act 1974 and the Management of Health and Safety at Work Regulations 1999.

For outdoor workers there is the added hazard of ultraviolet exposure. Sunburn today is painful; repeated exposure over a working life raises the risk of skin cancer.

Recognising Heat Stress Before It Becomes Serious

The early signs of heat stress are easy to miss, especially when everyone is busy. Watch for:

• Headaches, dizziness or light-headedness
• Heavy sweating followed, worryingly, by an absence of sweating
• Cramps in the arms, legs or stomach
• Nausea, unusual tiredness or confusion
• Fast, shallow breathing or a rapid pulse

If someone shows signs of heat exhaustion, move them somewhere cool, give them water, loosen tight clothing and let them rest. If they become confused, stop sweating, or lose consciousness, treat it as heat stroke and call 999. Brief your first aiders on this before the next hot spell, not during it.

Hydration: The Simplest Control of All

People routinely underestimate how much fluid they lose during hot weather, particularly in physical jobs. By the time someone feels thirsty they are already becoming dehydrated. Good practice is straightforward:

• Provide easy access to cool drinking water close to where people actually work, not just in the kitchen three floors away
• Encourage small, regular drinks rather than occasional large ones
• Remind teams that tea and coffee are no substitute for water, and that alcohol the night before makes dehydration worse
• For heavy physical work in serious heat, build in scheduled drink breaks rather than leaving it to chance

Drinking water is not a perk, it is a legal requirement. The Workplace Regulations require an adequate supply of wholesome drinking water for everyone at work.

Practical Adjustments That Make a Real Difference

Beyond hydration, a mix of small changes usually beats one big one:

• Rethink the schedule. Move heavy or outdoor tasks to early morning or later in the day, and save lighter duties for the hottest hours.
• Increase rest breaks. Short, frequent breaks in the shade or a cool room help the body recover.
• Improve airflow. Fans, opened windows, blinds on sun-facing glazing and portable air conditioning all help indoors.
• Relax dress codes sensibly. Where safety allows, lighter clothing keeps people cooler. Never compromise on necessary protective equipment, but do consider whether lighter-weight alternatives exist.
• Provide shade and sunscreen for outdoor teams. Encourage long sleeves in lightweight fabrics, hats with brims, and high-factor sunscreen on exposed skin.
• Look out for vulnerable workers. New and expectant mothers, older workers, people with certain health conditions and those on some medications feel heat effects sooner.

Make It Part of How You Manage, Not a Panic Response

The businesses that cope best with heatwaves are the ones that planned for them in spring. A short hot weather procedure, a supervisor briefing, and a stock of water and sunscreen cost very little. Waiting until the forecast hits 30 degrees usually means reacting a day too late.

If you would like help building weather-related risks into your risk assessments, or a fresh pair of eyes on your working arrangements, Integral Safety's health and safety consultancy supports businesses across the East Midlands with practical, proportionate advice. Get in touch for a friendly conversation.