Climbing during a heatwave: What to Keep in Mind

Summer can be a great time to climb outdoors: long days, dry rock, and more time outside with friends. But when temperatures rise, climbing and bouldering become more demanding, not just physically, but also in terms of safety, skin care, friction, and planning. Hot weather can turn a fun session into a frustrating or even risky experience if you are not prepared.

Here are the most important things to keep in mind when climbing or bouldering in the heat.

1. Choose the Right Time of Day

The easiest way to deal with heat is to avoid the hottest hours. Early mornings and late afternoons are usually the best options. Midday sun can make the rock hot, reduce friction, and increase the risk of dehydration or heat exhaustion.

If possible, plan your session around shade. East-facing crags are often better later in the day, while west-facing walls may be more comfortable in the morning. North-facing areas, caves, forests, and higher-altitude spots can also offer cooler conditions.

2. Prioritise Shade

Shade is your best friend in summer climbing. Direct sun heats both your body and the rock, making holds feel slippery and your shoes less precise. Boulder problems that feel manageable in cooler weather can suddenly feel impossible when the rock is warm.

Before heading out, check maps, guidebooks, or local climbing forums to understand when your chosen area is shaded. If there is no shade, consider choosing another sector or saving the project for another season.

3. Hydrate Before, During, and After

Hydration starts before you arrive at the crag. Drink water throughout the day and bring more than you think you will need. In hot conditions, sweating causes you to lose both fluids and salts, so electrolytes can be helpful during longer sessions.

A good habit is to take small sips regularly rather than waiting until you feel thirsty. Thirst can be a late signal that you are already behind on hydration.

4. Watch for Signs of Heat Stress

Heat can affect your judgment, coordination, and strength. Pay attention to warning signs such as dizziness, nausea, headache, unusual fatigue, muscle cramps, confusion, or a rapid heartbeat.

If you or your climbing partner notice these symptoms, stop climbing immediately. Move to shade, cool down, drink fluids, and avoid continuing the session until you feel fully recovered. No send is worth risking your health.

5. Adjust Your Expectations

Hot weather is not ideal for peak performance. Friction is worse, skin gets softer, and your body tires faster. Instead of expecting personal bests, use summer sessions for volume, technique, movement practice, or easier mileage.

This mindset shift can make the experience much more enjoyable. You may not send your hardest project in the heat, but you can still improve.

6. Take Care of Your Skin

Heat and humidity can make your skin sweatier and softer, which reduces grip and increases wear. Liquid chalk can help dry your hands before attempts, and regular chalking between burns becomes even more important.

After climbing, clean your hands and use skin care products if your tips are worn. If you are climbing multiple days in a row, consider taping during warm-ups to save skin for harder attempts.

7. Dress for the Conditions

Wear lightweight, breathable clothing for the approach and while resting. A hat, sunglasses, and sunscreen are essential if you will be exposed to the sun. Reapply sunscreen regularly, especially if you are sweating.

For bouldering, also think about your feet. Climbing shoes can become uncomfortable in hot weather, especially if your feet swell. Take your shoes off between attempts and let your feet cool down.

8. Rest More Than Usual

In hot conditions, your body works harder to regulate temperature. Longer rests between attempts can help you recover and reduce overheating. Rest in the shade whenever possible, and use breaks to drink water, cool your skin, and reassess how you feel.

A small towel, portable fan, or damp cloth can also make a big difference during hot sessions.

9. Be Smart with Gear

Heat can affect your equipment and comfort. Keep climbing shoes, chalk, food, and water out of direct sunlight. Metal gear can become hot to touch, and chalk may clump in humid conditions, so store it properly.

For bouldering, crash pads can also get very hot if left in the sun. Place them in shade when resting, and be mindful of how hot the landing zone becomes.

10. Know When to Stop

Sometimes the smartest decision is to call it a day. If the rock is too hot, your skin is failing, or the heat feels overwhelming, there is no shame in heading home, switching to an indoor session, or going for a swim instead.

Climbing is a long-term game. Protecting your body, skin, and motivation matters more than forcing one more attempt in bad conditions.

Final Thoughts

Climbing and bouldering in the heat require a different strategy. Choose shaded areas, start early or late, hydrate well, protect your skin, and lower your expectations. With the right preparation, summer climbing can still be fun, productive, and safe.

The key is simple: climb smart, stay cool, and listen to your body.