How Safety Leaders Can Reduce Heat Stress Risks

Every year, thousands of workers experience heat stress on the job — and workers are most at risk early in the summer. In fact, OSHA says that between 50% and 70% of outdoor fatalities occur in the first few days of working in warm or hot environments because the body needs to build a tolerance to the heat gradually over time.

Picture this. It’s the first truly hot day your team has worked through in a while. The jobsite is active, but the pace of work is noticeably slower. By mid‑morning, a few workers mention they’re thirsty. Someone adjusts their PPE to get more airflow. A couple of team members ask if they can take a break earlier than planned.

At the same time, the work still needs to move. Schedules matter. But you know heat changes how people work — their focus is scattered, their stamina is lacking and their decision‑making is altered. Your priority is clear. Keeping your team safe means recognizing the early signs of heat stress and putting the right controls in place so work can continue without pushing people past their limits.

Operations leaders should also take the lead in helping acclimate workers. Scheduling, supervision and realistic expectations all play a role. When acclimating crews is planned rather than assumed, your team is better prepared to work safely under demanding conditions.

What type of PPE helps in hot conditions?

Lightweight, breathable and moisture wicking protective workwear helps reduce heat buildup and discomfort. Heavy or non ventilated layers can increase strain, making it harder for workers to stay focused and compliant with required PPE.

When gear supports comfort, your team is more likely to wear it consistently throughout the shift. That consistency matters, especially when conditions make shortcuts tempting.

How can supervisors spot early heat stress symptoms?

Early signs of heat stress can be subtle. Fatigued, slowed movements or reduced focus may appear before more obvious symptoms. Training supervisors to notice these changes allows for quicker, simpler interventions.

Routine check ins can help encourage workers to step away to cool down and hydrate. When expectations are clear, addressing heat stress becomes a straightforward safety control rather than a disruption.

How does a strong safety culture reduce heat stress risks?

A strong safety culture provides clear guidance for hydration, rest cycles and response protocols. When these expectations are understood and reinforced consistently, your team knows what to do without hesitation.

Heat exposure doesn’t require constant attention, but it does require consistency. Treating heat safety as a standard part of operations helps maintain control and keeps your focus where it belongs — on protecting your team while work gets done.

Looking for ways to keep your team safe?

Learn more about PPE designed to support comfort in hot work environments.

Why is heat stress most dangerous right when the weather changes?

Heat stress is most dangerous when workers are not yet acclimated to heat exposure. Acclimation happens when the body gradually adapts to working in hot conditions, improving temperature regulation and reducing physical strain.

When temperatures spike, work on outdoor jobsites suddenly becomes much more physically demanding. Without gradual adjustment, even experienced workers can feel the effects sooner than expected. That’s why acclimation needs to be treated as part of operational safety planning, not something left to individual tolerance.

How much water should your team drink during hot workdays?

Your team should drink small amounts of water regularly, typically every 15 to 20 minutes, rather than waiting until thirst sets in. Frequent hydration helps regulate body temperature, maintain focus and reduce fatigue during physically demanding work.

Remember, accessibility matters. When water is easy to reach and built into the flow of work, hydration becomes routine instead of another reminder competing for attention during a busy shift.

Why are breaks important during hot work?

Regular breaks give the body time to cool down before heat strain builds. Shaded or air conditioned areas help lower core temperature and reduce physical stress caused by prolonged exposure.

These breaks also create natural moments to check in. A brief pause allows you and your supervisors to observe changes in pace, posture or attention that might otherwise go unnoticed.

How should your team acclimate to heat exposure?

It’s easier for workers to acclimate when heat exposure increases gradually over several days. Safety supervisors should consider lighter workloads or additional rest periods as crews adjust.