For many people in the UK, hot weather feels like something to celebrate. Sunshine appears, parks fill up, and suddenly everyone is talking about BBQs, beer gardens, and making the most of it while it lasts.
But the connection between heat and mental health is something many people underestimate.
If you’ve ever found yourself feeling unusually irritable, overstimulated, exhausted, emotionally foggy, or mentally drained during hotter weather, you’re definitely not alone.
And it’s not simply about “not coping well”.
There are genuine physiological and psychological reasons why heat can affect how we feel, think, and function — particularly for people who are neurodivergent, experiencing burnout, living with mental health challenges, or taking certain medications.
Why heat and mental health are closely connected
When temperatures rise, our bodies work harder to regulate themselves.
Sleep is often disrupted. Hydration levels drop more quickly. Energy fluctuates. Concentration becomes harder. Patience shortens. Even decision-making can feel more effortful.
And when the nervous system is already carrying stress, processing high levels of sensory information, or operating close to capacity, that additional load can quickly tip things from manageable into overwhelming.
What the research is beginning to show
Research is increasingly recognising that heat doesn’t just affect physical comfort — it can also influence sensory processing, nervous system regulation, and overall mental wellbeing.
At a broader level, global health research is beginning to highlight links between climate, extreme heat, and mental health outcomes. The World Health Organisation has outlined how rising temperatures and climate-related heat exposure can contribute to increased psychological distress and can exacerbate existing mental health challenges, particularly for people already experiencing vulnerability.
Alongside this, more specific research has explored how autistic and non-autistic adults experience temperature differently. A recent study published via ScienceDirect found that autistic participants reported significantly greater discomfort in both warmer and colder environments, particularly when temperatures moved outside a comfortable or “neutral” range. This suggests that temperature change may be processed more intensely within the nervous system, and may more easily affect attention, sensory load, and emotional regulation in some individuals.
Taken together, this growing body of evidence points to something many people recognise anecdotally: heat is not just a physical experience, but a sensory and neurological one too.
Neurodiversity and sensory overload in the heat
For many neurodivergent people, warmer weather can amplify existing sensory sensitivities and nervous system load.
That might look like:
- feeling overwhelmed more quickly in busy or noisy environments
- struggling with disrupted routines during warmer weather
- finding certain clothing, heat, smells, or physical sensations harder to tolerate
- increased irritability or emotional dysregulation
- reduced focus and executive functioning
- needing more recovery time than usual
Sometimes people assume they’re “being dramatic” or “not managing very well”, when actually their nervous system is simply processing significantly more input and stress.
This is also why periods of heat can sometimes intensify the build-up of stress and anxiety many neurodivergent people are already navigating day to day. More on this can be explored in this blog on managing stress and anxiety as a neurodivergent individual and how overwhelm often develops gradually rather than all at once.
Medication and heat: something many people aren’t told about
Some medications used for mental health conditions or ADHD can also affect how the body responds to heat.
Depending on the medication, this may impact:
- hydration levels
- sweating
- body temperature regulation
- sleep quality
- appetite
- fatigue levels
This doesn’t mean medication is unsafe or should be stopped — but it does mean that during hotter weather, it may be important to pay closer attention to hydration, rest, overheating, and overall energy levels.
The UK government has published guidance on mental health medications and extreme weather, including signs to look out for and ways to stay safe in hotter temperatures. The CDC has also highlighted how some stimulant ADHD medications and psychotropic medications may interfere with temperature regulation and heat tolerance.
If there are concerns about medication and heat, it’s always best to speak to a GP or pharmacist rather than changing anything independently.
Sometimes wellbeing really is about the basics
During periods of stress, burnout, or environmental change, the basics often matter more than ever.
Things like:
- drinking enough water
- eating regularly
- protecting sleep where possible
- reducing sensory load
- spending time in cooler or quieter environments
- adjusting expectations around productivity
- resting before hitting exhaustion
None of these are revolutionary.
But they are foundational.
And often, the more overloaded people become, the more likely they are to stop doing the very things that help support them.
That’s why approaches based around small sustainable habits and simple wellbeing foundations can often be more effective than all-or-nothing approaches.
The NHS heatwave advice also includes practical guidance on hydration, cooling, and recognising signs of heat-related illness.
Adapting isn’t weakness
One of the biggest lessons many neurodivergent people learn over time is that pushing through at all costs usually comes with consequences eventually.
Hot weather can be one of those times where the body asks for things to slow down, simplify, and become a little more intentional.
That doesn’t mean avoiding life or wrapping people in cotton wool.
It simply means recognising that wellbeing is not separate from the environment people are functioning in.
The goal isn’t to function perfectly regardless of the conditions around us.
It’s to understand ourselves well enough to adapt with a little more compassion and intention.
Sometimes wellbeing support starts with simply noticing what affects us more than we realised.
And sometimes, having space to explore those patterns with the right support can make a real difference too. Coaching support can help build greater awareness of personal stressors, energy levels, nervous system needs, and the practical strategies that genuinely support wellbeing in everyday life.
If you’d like to explore working together, you can book a discovery call or get in touch via the contact page
