From loading docks exposed to direct sun to indoor production areas that trap heat, summer conditions can quickly disrupt warehouse and manufacturing operations. Adding fans, water stations, or extra breaks helps, but maintaining adequate staffing is one of the most practical ways to protect workers and keep production moving.
Workforce instability during high-heat periods typically starts with rising absenteeism, fatigue, turnover, and lower output. These pressures get worse when understaffing increases overtime and leaves fewer people carrying the workload. So what can operations managers and HR directors do when high temperatures start threatening workforce continuity?
Heat Is Now a Workforce and Compliance Issue
Warehouse heat safety means protecting employees from indoor and outdoor conditions that can cause illness, fatigue, and injury. Those risks vary by facility. Loading docks may expose workers to direct sun, while warehouses and production floors can trap heat or generate it through machinery.
On April 10, 2026, OSHA revised its National Emphasis Program for heat hazards. The program focuses on 55 high-risk industries, including warehousing and manufacturing, and allows random inspections when local heat advisories or warnings are active.¹
As temperatures rise, workers are more likely to get hurt. The risk starts to increase around 85°F and accelerates above 90°F. At 105°F, injuries are about 15 percent more likely than at 80°F. At 110°F, they’re about 20 percent more likely.²
Heat safety can’t sit apart from staffing, scheduling, and daily operating decisions. Adequate coverage helps you manage breaks, absences, overtime, and task rotations before conditions become dangerous. A staffing partner that stays close to your workforce, not just at placement, gives you an earlier warning when heat is affecting your team and more options to act on it.
What Heat Does to an Already Stretched Operation
Heat stress happens when the body struggles to stay cool during hot working conditions. It can affect employees working outdoors or inside warehouses, loading areas, and manufacturing facilities.
Heat makes normal tasks harder and creates several workforce problems at once, including:
- More frequent breaks or recovery time
- Slower physical work
- Fatigue, dizziness, or muscle cramps
- Reduced concentration and slower reactions
- More mistakes around equipment or vehicles
- Higher absenteeism and lower output
- Greater pressure on employees covering vacant shifts
Unlike a single safety incident, heat can affect several parts of an operation at the same time. A facility may have enough workers under normal conditions but become understaffed when heat slows production or pulls employees off the schedule. You need enough coverage to rotate tasks, manage absences, and give workers time to recover safely.
When Understaffing Becomes a Safety Risk
You might be wondering whether asking employees to work longer shifts is really a safety concern. Overtime can help cover a call-out or keep production moving when the floor is short-staffed. But relying on longer hours too often creates new problems, especially during periods of sustained heat.
A US study of more than 10,000 workers found that jobs with overtime schedules had a 61 percent higher injury rate than jobs without overtime. Working at least 12 hours per day was also linked to a 37 percent higher injury rate.³ The study didn’t examine heat and overtime together, but both place added strain on workers.
You might notice employees moving more slowly, losing focus, or taking longer to react. Tasks that are usually routine can become harder when tired workers are lifting materials, operating forklifts, or working around moving equipment. The National Institute for Occupational Safety and Health (NIOSH) reports that fatigue can reduce attention and reaction time, and some researchers estimate it may play a role in nearly one in eight workplace injuries.⁴
Managers sometimes need to extend a shift or approve overtime to meet an urgent need. The concern starts when overtime becomes the standing answer to every absence. In a hot environment, repeated long hours leave workers with less time to rest and recover between shifts.
Adequate staffing doesn’t replace water, rest breaks, training, or a heat illness prevention plan. It gives you more options to cover absences, rotate demanding tasks, and protect recovery time — which makes it a practical risk-reduction tool, not just a way to fill open shifts.
Build the Staffing Buffer Before Temperatures Peak
Is it necessary to add staffing support before the hottest days arrive? Yes. Waiting until several employees call out leaves you with few options beyond overtime and extended shifts.
Sudden absences can happen any time, but heat-related staffing problems are easier to manage when you identify your hottest departments, hardest-to-cover shifts, and most vulnerable roles before summer conditions peak.
A staffing buffer also gives new workers time to complete training and adjust gradually to hot conditions. NIOSH recommends increasing heat exposure over seven to 14 days rather than expecting new workers to carry a full workload immediately.⁵
If your operations run hot and your staffing levels are already stretched, that’s a risk conversation worth having before conditions peak. Talk to Vision Companies about building the workforce buffer your floor needs this summer.
References:
- U.S. Department of Labor. “US Department of Labor Updates National Emphasis Program to Protect Workers from Indoor, Outdoor Heat Hazards | Occupational Safety and Health Administration.” Osha.Gov, 10 Apr. 2026, https://www.osha.gov/news/newsreleases/osha-national-news-release/20260410. Accessed 20 July 2026.
- Alahmad, Barrak, et al. “A Nationwide Analysis of Heat and Workplace Injuries in the United States.” Environmental Health, vol. 24, no. 1, BioMed Central, Oct. 2025, https://doi.org/10.1186/s12940-025-01231-1.
- Dembe, A. E., et al. “The Impact of Overtime and Long Work Hours on Occupational Injuries and Illnesses: New Evidence from the United States.” Occupational and Environmental Medicine, vol. 62, no. 9, Sept. 2005, pp. 588–97, https://doi.org/10.1136/oem.2004.016667.
- CDC. “Working Hours and Fatigue: Meeting the Needs of American Workers and Employers.” NIOSH Science Bulletin, 12 Apr. 2023, https://www.cdc.gov/niosh/bulletin/2023/fatigue.html. Accessed 20 July 2026.
- CDC. “Heat Stress in Construction.” NIOSH Science Bulletin, 21 May 2020, https://www.cdc.gov/niosh/bulletin/2020/heat-stress-construction.html. Accessed 20 July 2026.
