When temperatures rise, many people feel uncomfortable. But for neurodivergent employees, hot weather can become far more than an inconvenience, it can significantly affect concentration, well-being, productivity, and physical health.
As UK summers become warmer and heatwaves become more frequent, understanding how heat affects neurodivergent employees is becoming an important part of creating inclusive workplaces.
Heat and the Neurodivergent Nervous System
One of the characteristics of autism is hyper- or hypo-reactivity to sensory input. Many individuals with ADHD also experience sensory processing differences. This means the nervous system may respond much more intensely, or sometimes less noticeably, to environmental stimuli, including temperature.
For many neurodivergent people, heat isn’t simply “feeling warm.” It can feel overwhelming, painful, or impossible to ignore. Bright sunlight, humidity, sweating, warm clothing, poor ventilation, or crowded spaces can all combine to create sensory overload. Instead of gradually becoming uncomfortable, the body may experience an immediate and intense stress response.
Why Heat Can Be Harder to Notice
Another important factor is interoception, the ability to recognise and interpret signals coming from inside the body. Many autistic and ADHD individuals experience differences in interoception. This means someone may not realise they are becoming dangerously hot until they are already approaching heat exhaustion.
Rather than noticing subtle signs like thirst or increasing body temperature, they may only recognise something is wrong once they experience:
- Dizziness
- Nausea
- Headaches
- Extreme fatigue
- Irritability
- Shutdown or overwhelm
How the Brain Affects Heat Regulation
Body temperature is regulated by the hypothalamus, the brain’s internal thermostat. It relies on neurotransmitters such as dopamine and noradrenaline to coordinate cooling responses like sweating, thirst, and seeking a cooler environment.
As autism and ADHD are associated with differences in these neurotransmitter systems, researchers believe some neurodivergent people may regulate and respond to heat differently. This may mean they experience heat stress and fatigue more quickly or find it harder to cool down once overheated.
These individuals also experience interoception differences, meaning they may not realise they are becoming dangerously hot until they are already experiencing significant physical distress. In addition, executive functioning differences can make responding more difficult, as remembering to drink water, take breaks, or actively cool down isn’t always straightforward.
These differences can increase the risk of sensory overload, dehydration, exhaustion, and, for some autistic people, shutdown during periods of hot weather.
What Employers Can Do
Small adjustments can make a significant difference. Employers can employees by:
- Allowing flexible dress codes with lightweight clothing
- Providing access to fans or cooler workspaces
- Encouraging regular hydration breaks
- Offering flexible working or homeworking during extreme heat
- Reducing unnecessary sensory demands where possible
- Providing quiet, cool recovery spaces
- Recognising that someone may not realise they are overheating until they need immediate support
These adjustments often benefit everyone, not just neurodivergent employees.
Why This Matters
Research into neurodiversity and thermoregulation is still emerging. However, the experiences reported by neurodivergent communities are consistent with growing evidence that sensory processing, interoception, autonomic nervous system function, and executive functioning can all influence how heat is experienced. Understanding these differences becomes increasingly important for creating workplaces where everyone can work safely, comfortably, and at their best.
