Heat Safety for Temporary Workers on Industrial Sites: Your Duty of Care This Summer
A temporary worker arriving on a hot warehouse or plant floor does not yet know the site, the pace, or the warning signs, and that is exactly when heat becomes dangerous.
By National Temping Recruitment 22 July 2026 7 minute read
Heat safety for temporary workers is a duty of care that too many employers assume the agency handles for them. When a warehouse, plant, or oil and gas site takes on agency staff during a heatwave, the responsibility for keeping them safe sits largely with the business that controls the site. Temporary workers are more exposed precisely because they are new: they have not acclimatised, may not recognise the early signs of heat stress, and are often reluctant to speak up on their first few shifts.
This matters across the industrial sectors we recruit for. A warehouse operative in a metal-clad unit, an operator beside a furnace, or a technician on a summer shutdown all face core temperatures that build quietly over a shift. Getting it right protects the individual, protects your output, and keeps you on the right side of the law.
Why temporary workers face higher heat risk
- They have not acclimatised to the site, so their bodies have not adjusted to the heat, the pace, or the physical demands of the role.
- They may not know where water, shade, or rest areas are, or who to tell when they start to feel unwell.
- New workers often want to prove themselves, so they push through early warning signs rather than stopping to cool down.
- Language, unfamiliar equipment, or a rushed induction can leave heat guidance unread or misunderstood on day one.
Who Is Responsible for a Temporary Worker in the Heat
A common misunderstanding is that the agency carries the safety burden once a worker is on site. In practice the responsibility is shared, but it tips heavily toward the host employer. Under the Health and Safety at Work etc. Act 1974, the business that controls the workplace owes a duty of care to everyone there, including agency staff. The HSE guidance on the health and safety of agency and temporary workers sets out how those duties are split between the agency and the host.
In plain terms, the host manages the risks on the floor: the temperature, the pace, access to water and rest, and the induction that tells a worker what to do when they feel unwell. The agency supplies workers fit for the role and passes on the safety information the host provides. A reputable partner briefs candidates honestly before they accept a shift, which is one reason a REC and APSCo accredited agency reduces your risk.
This shared duty is why communication before day one matters. When we place staff into hot environments through our warehouse recruitment service, we make sure candidates understand the physical nature of the work and the protective clothing involved, so nobody arrives unprepared.
Practical Heat Controls for Temporary Staff
There is no maximum legal working temperature in the UK, but the law requires employers to keep the workplace at a reasonable temperature and control the risks heat creates. The steps below matter most for temporary workers, who are most likely to overheat in their first week on a site they do not yet know.
1Induct every temporary worker on heat before their first shift
Show them where water and rest areas are, explain the signs of heat stress, and tell them who to speak to the moment they feel unwell. Do not assume the agency has covered it in detail.
2Make hydration easy and constant
Provide cool water close to the work area and encourage regular small drinks rather than waiting for thirst. On busy lines, a worker who has to walk far for water simply drinks less.
3Adjust the work, not just the worker
Rotate people out of the hottest tasks, add rest breaks in cooler areas, and move the heaviest work to the cooler parts of the day where the operation allows.
4Allow time to acclimatise
A new worker’s body needs several days to adapt to heat. Ease temporary staff into a full workload over their first shifts rather than expecting peak output from hour one.
PPE and the Hidden Heat It Traps
Protective equipment saves lives, but in hot weather it also traps heat and slows the body’s ability to cool itself. High-visibility clothing, overalls, gloves, and respirators all add a thermal load, and a worker in unfamiliar PPE feels it more sharply. Never remove necessary protection, but plan around it: choose breathable options where the risk assessment allows, add breaks for anyone in heavy kit, and watch for early signs of distress.
This balance matters most on manufacturing and processing sites, where machinery adds heat on top of the weather. Our manufacturing recruitment team places operators and line staff briefed on the protective equipment a role requires. The same principles apply outdoors, and our detailed guide to working in hot weather on construction sites covers the site-specific measures in more depth.
| Sector | Where heat risk builds for temporary staff |
|---|---|
| Warehouse and logistics | Metal-clad units hold heat, and physical picking or loading in high-vis clothing raises core temperature fast. |
| Manufacturing | Ovens, furnaces, and machinery add ambient heat on top of the weather, with little airflow around fixed workstations. |
| Construction | Outdoor work in direct sun, physical labour, and mandatory PPE combine to push heat exposure higher through the day. |
| Oil, gas, and processing | Sealed suits, confined spaces, and hot process equipment during summer shutdowns raise the risk for maintenance crews. |
A temporary worker who feels safe enough to say they are struggling in the heat is far safer than one who pushes through to make a good impression. Culture, not just cold water, keeps people well.
NTR employer support team
Spotting Heat Stress Before It Becomes an Emergency
Heat stress builds gradually, and the early signs are easy to miss on a busy floor. Watch for a worker slowing down, sweating heavily, becoming confused, complaining of a headache, or looking pale and unsteady. These signs mean the body is struggling to cool itself, so act at once: move the person to a cool area, give them water, and let them rest. The gov.uk guidance on staying safe in hot weather helps with spotting and responding to heat-related illness.
The key with temporary staff is to make clear that stopping to cool down is expected, not a failure. A supervisor who checks in during a heatwave, and names the signs during induction, removes the pressure to push through. This is why our temporary staff hire service supplies workers who arrive informed and confident to raise concerns.
Summer tip: add a short heat safety section to every temporary worker’s induction. Two minutes on where the water is, what heat stress feels like, and who to tell can prevent an incident that costs you a shift or far worse.
Frequently Asked Questions
Keep Your Summer Workforce Safe and Productive
Heat safety for temporary workers comes down to two things: recognising that the duty of care sits largely with you as the host employer, and preparing new staff before they set foot on the floor. Induct on heat, make hydration effortless, adjust the work around the hottest hours, and build a culture where stopping to cool down is expected. For help sourcing vetted temporary staff who arrive briefed and ready for industrial conditions, speak to our team through our contact page or on 0333 772 9824.
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