Summer is supposed to be the easy season: long evenings, holidays, more time outdoors. For many people it genuinely lifts their mood. But not everyone feels their best in the heat. Disrupted routines, poor sleep on hot nights, money pressures from holidays, body image worries and the feeling that everyone else is having more fun can all weigh on your mental health.
Research also shows that heat itself affects the mind. This guide looks at why summer can be harder than expected, and offers practical, evidence-based ways to protect your mental wellbeing through the warmer months.
How hot weather affects your mental health
It’s not just your imagination if you feel more irritable or anxious during a heat wave. A large study in JAMA Psychiatry, covering more than 3 million emergency room visits across the US, found that mental health-related visits rose on the hottest summer days. Increases were seen for stress, anxiety, mood disorders and substance use. A 2026 study in Nature Health found that long heat waves push mental health hospital admissions higher over the following days, especially among older adults.
Researchers think several things are going on:
- Poor sleep. Hot nights make it harder to fall and stay asleep, and broken sleep is one of the strongest triggers for low mood and anxiety. In a UK survey, more than half of people said they struggle to sleep in hot weather.
- Physical stress. When you overheat, your heart rate rises and your body’s stress response kicks in, which can feel a lot like anxiety.
- Dehydration, which can cause fatigue, headaches and difficulty concentrating.
- Medications. Some medicines used for mental health, including certain antidepressants, antipsychotics and lithium, can affect how your body handles heat or fluids. Don’t stop any medication, but ask your doctor or pharmacist how to stay safe in a heat wave.
Summer depression is real
Most people have heard of seasonal affective disorder (SAD) in winter. A smaller group experiences a summer pattern instead. Instead of oversleeping and craving carbs, people with summer-pattern depression are more likely to have trouble sleeping, a poor appetite, restlessness and agitation. If you notice your mood dipping at the same time each year, mention it to your doctor. It’s treatable.
Other common summer stressors include:
- Loss of structure when school, work or social routines change
- Pressure to travel, socialize and post a perfect summer online
- Body image concerns around swimwear and hot-weather clothing
- Extra costs from holidays, childcare and events
- Loneliness when friends are away
Eight practical ways to look after your mental health this summer
1. Protect your sleep
Sleep is the foundation. On hot nights:
- Close curtains during the day to keep rooms cooler, and open windows when it’s cooler outside.
- Use a fan, light cotton or linen bedding and loose sleepwear.
- Take a lukewarm (not cold) shower before bed to help your body cool down.
- Keep a consistent wake-up time, even on holidays.
- Limit alcohol and late caffeine, both of which disrupt sleep.
Struggling more broadly with sleep? Our article on omega-3s and insomnia also covers the habits that help most.
2. Get outdoors, at the right time of day
Time in nature is one of the best-researched mood boosters. Studies suggest that spending around two hours a week in green or blue spaces, such as parks, woods, lakes or the coast, is linked with better wellbeing. Morning daylight also helps set your body clock, which supports sleep and mood.
In summer, go early or late in the day to avoid the strongest heat and UV. Find shade, carry water, and wear sunscreen and a hat.
3. Keep moving, gently
Regular physical activity reduces symptoms of depression and anxiety, sometimes as much as talking therapy or medication for mild to moderate depression. You don’t need intense workouts. Walking, swimming, cycling, yoga or dancing all count. In hot weather, exercise in the cooler hours, slow down and drink more water. Our guide to the benefits of regular physical activity explains why movement matters so much.
4. Build a loose routine
Summer often means fewer fixed commitments. A little structure helps your mind feel settled: regular meal times, a set bedtime, a daily walk, and one or two planned activities each week. Keep it flexible, but don’t let every day blur into the next.
5. Make real connections
Strong relationships are among the most powerful protectors of mental health. Use longer evenings to see friends, call family, join a local group, volunteer or invite a neighbor for a walk. If friends are away, schedule a regular video call. Quality matters more than quantity; one honest conversation can do more than a dozen busy gatherings.
6. Take a break from comparison
Social media in summer can feel like a highlight reel of perfect beaches and beach bodies. If scrolling leaves you feeling worse, mute accounts that trigger comparison, set time limits on apps, or take a few days off entirely. Your summer doesn’t need to look like anyone else’s to be good.
7. Eat and drink for steady energy
Dehydration can make you tired, foggy and irritable. Keep a water bottle with you and eat water-rich foods like watermelon, cucumber and berries. Regular meals with protein, fiber and healthy fats help keep blood sugar and mood more stable. Our post on how to eat nutritious foods to improve your mood has more ideas, and our guide to summer foods to avoid covers hot-weather food safety.
8. Make time to reflect and slow down
Mindfulness, meditation, prayer, yoga or journaling can lower stress and help you notice your thoughts without getting swept up in them. Even five minutes a day helps. Try writing down three things that went well each evening, or start with our tips for getting started with meditation.
Use summer to set small, meaningful goals
Summer can be a good time to try something new without the pressure of the rest of the year. Choose one or two small goals that matter to you, such as reading a book a week, learning to swim, planting herbs, finishing a creative project or walking a certain trail. Achievable goals give a sense of progress and purpose. For more ideas on building a satisfying life, read our post on creating a life worth living.
Plan holidays that actually rest you
Time off can be restorative, but it can also be stressful. A few tips:
- Set a realistic budget so money worries don’t follow you home.
- Build in downtime rather than filling every hour.
- Set an out-of-office message and decide in advance whether you’ll check work email at all.
- Remember that a “staycation” with day trips, good food and rest can be just as refreshing as a big trip.
Check in on people who struggle in the heat
Heat waves are hardest on older adults, people living alone, people with long-term physical or mental health conditions, and anyone without air conditioning. A short phone call or visit during a heat wave can make a real difference. Check that they have water, a cool place to rest and any medication they need, and that they know how to get help if they feel unwell. Public libraries, shopping centers and community cooling centers can offer relief on the hottest days. Looking out for others also tends to lift our own mood, because helping is one of the most reliable ways to feel connected and useful.
Know the signs that you need more support
It’s normal to have off days. Reach out to a doctor or mental health professional if you notice:
- Low mood, anxiety or irritability lasting more than two weeks
- Big changes in sleep or appetite
- Losing interest in things you usually enjoy
- Withdrawing from friends and family
- Using alcohol or other substances to cope
- Stress that’s affecting work, relationships or daily life (see our article on the health impact of stress)
If you’re in the US and struggling, you can call or text 988 to reach the Suicide and Crisis Lifeline any time, day or night. In other countries, contact your local emergency number or a crisis line. If you or someone else is in immediate danger, call emergency services.
Common questions
Can hot weather make anxiety worse?
Yes. Heat raises your heart rate, disrupts sleep and can cause dehydration, all of which can make anxiety feel worse. Studies show mental health emergency visits rise on very hot days.
Is summer depression a real thing?
Yes. A summer pattern of seasonal affective disorder exists, often with insomnia, poor appetite and restlessness. Talk to a doctor if your mood dips at the same time each year.
How can I sleep better in hot weather?
Keep your bedroom shaded during the day, use a fan and light bedding, take a lukewarm shower before bed, keep a regular wake time and limit alcohol and late caffeine.
How much time outdoors helps mental health?
Research suggests around two hours a week in nature is linked with better wellbeing. In summer, go out in the cooler morning or evening hours.
Do mental health medications affect heat tolerance?
Some can, including certain antidepressants, antipsychotics and lithium. Don’t stop your medication; ask your doctor or pharmacist how to stay safe in hot weather.
This article is for general information and isn’t a substitute for professional mental health advice.
Explore more wellbeing articles in our mind and body section.
