Summer Hill Walking Tips: How Warm Weather Changes the Hills

Summer is when most people decide to get on the hills. The days are long, the forecast looks settled, and after a winter indoors the temptation to just go is strong. And it’s a brilliant time to be out there.

But here’s the thing most people get wrong. They assume summer is the safe season. Winter is the dangerous one, summer is the easy one, and you can leave the careful planning for when there’s snow on the ground.

Summer hill walking has its own set of risks, and they catch people out precisely because nobody expects them. These summer hill walking tips are about the things that change when the weather warms up, so your first walk of the season is a great day out rather than a hard lesson. I’ve spent fifteen years on the UK hills in every season, and I’ve seen far more people come unstuck on a hot July afternoon than on a cold one.

Why Summer Is More Dangerous Than You Think

So, why does the easy season catch people out? Because the dangers in summer are quiet ones. They build slowly and they don’t look like dangers until you’re already in trouble.

The big one is dehydration and heat. On a cold day your body tells you loudly that you need to layer up. On a hot day, the warning signs are easy to ignore until you’re already struggling. Walking uphill in direct sun with a heavy rucksack is hard work, and you lose fluid faster than you think. Headache, dizziness, and feeling sick are the early signs of heat exhaustion. Push through them and it can tip into heatstroke, which is a genuine emergency. The signs there are different and more serious. A racing pulse, confusion, and skin that goes red and dry because the body has stopped sweating.

The second thing people underestimate is summer thunderstorms. The UK gets unsettled, thundery spells in summer, and the worst place to be when lightning is around is a high, exposed ridge or summit. These storms often build through the afternoon after a warm, still morning, so a sky that looks perfect at 9am can turn nasty by 2pm.

If you ever do get caught out by a storm, get down off the ridge or summit straight away and lose height. Put some distance between yourself and anything metal, walking poles and a metal-framed rucksack included. Then crouch down low on top of your rucksack or a sleeping mat to insulate yourself from the ground, making yourself as small as you can. Don’t shelter under a lone tree, in a shallow cave, or under a rock overhang. Lightning can jump across those gaps to reach the ground, and that’s a genuinely dangerous place to be.

Then there’s the simple problem of overconfidence. Because summer feels benign, people head out in trainers with a single small bottle of water and no waterproof, on routes they’d never attempt so lightly in spring. The hill hasn’t got any smaller. It still deserves respect.

In short, summer doesn’t punish you with cold. It punishes you with heat, exposure, and the false sense that nothing can go wrong. Treat it with the same care you’d give any other season and you’ll be fine.

Kit Adjustments for Warm Weather

A lot of summer kit advice is really about swapping winter weight for summer protection. You’re not carrying less, you’re carrying different things.

Water is the big change. Carry more than feels necessary. As a rough guide, two litres is a sensible starting point for a half-day walk in warm weather, and more if it’s properly hot or you’re out all day. As a rule of thumb, plan for around a litre for every two hours of walking, and bump it up in the heat. If your route passes a reliable refill point, plan around it, but never assume a stream will be running in a dry summer, and if that stream is safe to drink!

It’s worth adding something with electrolytes too, especially on hot days. Plain water replaces the fluid you sweat out but not the salts, and a cheap sachet of rehydration powder weighs nothing.

One word of caution the other way, because it surprises people. You can drink too much. Forcing down litre after litre of plain water flushes out your body’s salts and can cause a dangerous condition called hyponatremia, which in serious cases leads to confusion and seizures. The simple fix is to drink to thirst rather than constantly, and use the colour of your wee as a guide. Pale straw is about right. Too dark means drink more, completely clear means ease off.

I once had a student under remote supervision who had told me he had drunk over 6 litres of water after his mum warned him so much to drink loads, he was fine but unfortunatly was ill enough to have to have a trip to the hospital.

Sun protection is kit, not an afterthought. Pack:

1. A sun hat with a brim, or a cap with a neck cover.
2. Sunglasses. Glare on a long day is tiring, and on snow patches it’s worse.
3. High-factor suncream, reapplied through the day. The sun is stronger at altitude and the wind hides how much you’re burning.

Now, the bit people skip. Take warm and waterproof layers anyway. I know it feels daft shoving a fleece and a waterproof in your bag on a baking morning. But the layering system still applies in summer. Get caught by a thunderstorm or stuck out longer than planned, and the temperature on an exposed summit can drop fast, even in July. A lightweight waterproof and a packable warm layer cost you almost nothing in weight and turn a miserable situation into a manageable one. If you want the full breakdown of how layering works across the seasons, our spring hill walking tips guide covers the system in more detail.

Don’t forget walking boots over trainers for anything rough or steep, and check for ticks when you get home if you’ve been through long grass or bracken. Ticks are far more active in summer and can carry Lyme disease, so a quick check is well worth the habit.

How Summer Changes Navigation

People assume navigation gets easier in summer because visibility is better. Often it does. But summer changes a few things that can trip you up if you’re not ready for them.

First, summer growth hides paths. Bracken, heather, and long grass can swallow a faint path completely by July. A route that was obvious on a bare spring hillside can disappear under waist-high vegetation, and you end up trusting your navigation rather than just following a worn line on the ground.

Just a feew weeks ago I had to go ‘rescue’ a group who were getting completely lost in the bracen and coule not find the footpath they were ment to be on. After I found them, even with my 20+ years of navigation it was hard work to navigate them through the woodland and back to a more well trodden footpath. only a couple of months prior I had walked that path completely fine with a group of students.

Second, phone batteries hate heat. A phone left in a hot pocket or sitting in direct sun can drain fast or shut down entirely. If your navigation plan is “I’ll just use the app”, a dead phone in the middle of a long summer day leaves you with nothing.

This is exactly why I teach map and compass as your foundation, with the phone as a backup rather than the other way round. A map doesn’t run out of battery and it doesn’t overheat. If you’re not yet confident reading the ground in front of you, that’s a skill worth building before you rely on it out there.

And don’t write off mist just because it’s summer. Warm, humid air can still bring low cloud rolling in, and being suddenly socked in on unfamiliar ground is disorientating whatever the month. The ability to navigate when you can’t see far is a summer skill too, not just a winter one.

Never Feel Lost Again: The Free UK Navigation & Safety Pack

Stop relying solely on a fragile phone battery. Download the exact tools a professional outdoor instructor uses to stay safe in the British hills.

Enter your email below to get instant access to:

• NEW: The Hike Planning & Safety Checklist: A comprehensive pre-walk checklist to ensure you never leave a critical item behind or rely purely on a smartphone.
• The Emergency Protocol Guide: A highly structured, zero panic system detailing exactly what to do if lost on Dartmoor/Scottish hills, including when and how to call Mountain Rescue.
• The OS Map & Navigation Cheat Sheet: A quick reference guide to decoding complex map symbols and plotting grid references when your mind goes blank.
• The Route Card Template: The exact, logic-driven framework I use to plan foolproof expeditions and identify safe escape routes before leaving the house.
• The Timing Crib Card: Never misjudge daylight again. Master the mathematics of measuring pacing distance and timings for steep ground.

Email Address*

Planning for Long Daylight Hours

The best thing about summer is the daylight. In high summer the sun might not set until ten in the evening, which opens up longer routes and takes the time pressure off.

But long days come with their own traps.

Don’t let the late sunset make you lazy with timings. Just because the sun doesn’t set until ten doesn’t mean you want to be high on a hill at half nine. Plan your walk around a sensible finish time, not the last possible minute of light. Tired, hungry, and racing fading light is how avoidable mistakes happen.

Start early to beat the heat and the storms. This is the single best summer habit. An early start means you do the hard climbing in the cool of the morning, you’re off the high, exposed ground before any afternoon thunderstorms build, and you’ve got the whole day in hand if anything slows you down.

Here’s how I’d plan a summer walk:

1. Check a proper mountain forecast the night before and again that morning. The Met Office mountain forecasts and MWIS both tell you about wind, cloud, and the chance of thunderstorms, in the kind of altitude-specific detail a standard phone app won’t give you.
2. Pick your start time to get the climbing done early.
3. Build in extra water stops and a sensible turnaround time.
4. Tell someone your route and when you expect to be back.

If you’re planning a bigger summer route, especially somewhere new, our guide to planning a safe walk in Snowdonia walks through the whole planning process step by step, and the principles apply wherever you’re heading.

The hills in summer are genuinely wonderful. Long light, warm rock, and routes you can take your time over. You just need to respect that the easy season has teeth of its own. Get your water, your sun protection, your backup layers, and your timings right, and you’ve got the makings of a brilliant day.

So, what’s your first summer route going to be? Have a think about where you fancy heading, then plan it properly before you go. Ask any questions in the comments below.

Want to feel properly prepared before you set off? The free Digital Prep & Planning Course walks you through planning a safe walk from start to finish, including kit, weather, and route choice. It’s the perfect place to start before your first summer walk.

If you want to go further and learn the navigation skills that make any hill day feel calm rather than nerve-wracking, that’s exactly what the Bondringo Mountain Navigation Course is built for. Map reading, compass work, route planning, and what to do when things don’t go to plan. All online, all self-paced, and built around real UK conditions.

Frequently Asked Questions