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How to drive safely in hot weather

Despite the fact we get a summer every year in the UK, warm weather can still feel like something of an alien concept on these rain-swept isles. That's especially true on the roads – you might be confident driving in drizzle or braving the cold, but summer throws up some unique challenges that can catch unwary drivers out.

High temperatures can be deceptive for motorists – surely without the threat of snow and ice, the roads are safer right? That might be partially true, but there are hot-weather hazards like blinding sunshine and endless tree sap that can make seeing out tricky, along with the constant challenge of keeping everyone cool when you could cook an egg on the pavement.

Is it safe to drive in hot weather?

In short, yes, it's generally safe to drive in hot weather and you shouldn't let high temperatures put you off using the roads. Hot and sunny conditions are a great opportunity to head out and explore the UK's many scenic locations, and a little preparation will make sure you don't get hot under the collar while behind the wheel.

Check your tyres

Closeup of car tyre in hot weather

You shouldn't need to do any more mechanical safety checks during the summer than you would on your car at any other time of year. However, one thing to be mindful of is your tyres.

Hot ambient temperatures can see tyre pressures increase, which might push your tyres above their happy operating window. Having too much pressure in your tyres can lead to reduced grip and excess wear, so make sure to check them using a pressure gauge or a pump at a petrol station.

Cycling from cold winter to hot summer weather will also put thermal stress on the tyre rubber, which can increase the risk of a failure over time. If you spot any small cracks starting to form on the tyre's surface, it's probably time to consider changing it for a fresh one.

Make sure you can see

A key ingredient in safe driving is the ability to see properly. While you won't find your view blocked by snow, ice or condensation during the summer, there are still factors that can impact visibility from the driver's seat.

Check your windscreen

Large chip in a car's windscreen

Bright sunshine leaves nowhere for chips, scratches and streaks on your windscreen to hide. The glaring light means they'll show up more obviously than ever and, if they're really bad, it can dangerously obscure your vision. Plus, minor windscreen damage can easily turn into a major crack if you hit a pothole or bump, so it's significantly safer to get your windscreen repaired or replaced as soon as you notice a problem. Many insurers include windscreen coverage in their policies, so you might find a hefty discount from your provider for claiming to get a damaged screen put right.

Keep your screenwash topped up

Rain might feel like a constant companion in the UK, but it's much less frequent in the summer. That's usually when you notice its absence, because now there's nothing periodically cleaning your windscreen of grime and dead insects – and that means relying on your screenwash much more in the summer than you might in the winter.

Be wary of tree sap

Car parked under a tree

One reason you might go through so much screenwash in the summer is because trees give off lots of sap during hotter months. Sap sticks like glue to your car's glass and bodywork, and can very quickly make it hard to see the road properly if you don't clean it off. It's a good idea to avoid parking your car underneath trees if you can avoid it during the summer, as this'll reduce the amount of sap it's exposed to – otherwise, you might want to get on first-name terms with your local car wash.

Keep a pair of sunglasses handy

Driver wears sunglasses while driving in sunshine

This is a great idea. Not only will you have protection for your eyes as soon as the sun starts glaring, but also means you can look like a cool cucumber at a moment's notice!

Jokes aside, bright sunshine can make it hard to look directly at the road or other cars as reflections flash off them. Sunglasses – even cheap, plasticky ones if you don't want to shell out for the posh Ray Bans – are an easy way to keep your eyes safely on the road, so leave a pair in your glovebox for when the sun breaks through the clouds.

Use sunshades

A baby looks placid in a car seat while a sunshade blocks out the sun's rays

Chances are, your car already has a pair of sun visors mounted at the top of the windscreen. These can be folded down to help block out bright sunshine, and most can also be folded to the side if you're travelling at an angle from the sun.

You can also purchase removable sunshades for your side windows. These may use rubber suction cups to mount inside a window, or may drape over both sides of the window, and are made of a dense mesh that drastically reduces the amount of light that makes it into the car. These are especially great for children in the back seats because they keep cabin temperatures down and block glare from any screens they're using.

Keep everyone cool

Now you can see clearly, we still need to battle the other challenge in hot weather – the heat itself. This is much more important for passengers, as they'll expire in hot weather long before your car does.

Use your air con

Car air conditioning control knob

Air conditioning (A/C) is the first line of defence against hot weather and the majority of modern cars come with it as standard. This uses a system a little like your refrigerator to cool the ambient air before pumping it into the cabin. Basic or manual A/C usually just lets you set the system to cool the car, while more advanced climate control setups automatically regulate the A/C to keep the cabin at a set temperature. It's a good idea to turn your car's A/C on briefly on a monthly basis – even during colder months – to keep the system running smoothly. You don't want to get to a heatwave and find out your air con is no longer working!

Open your windows if you don't have air con

If your car doesn't come with air conditioning, you'll need to use your windows instead to cool the cabin. Opening just one window can be effective to reduce interior temperatures but this tactic becomes more effective when you open two or more windows. This encourages air to flow through your car as you drive, carrying the hot cabin air away and drawing in fresher, cooler air.

Air con vs windows – which is more efficient?

Person giving a thumbs up through an open car window

Some drivers prefer having their windows down, others swear by their air con. Both options bring a small penalty in fuel consumption, but which option is better if you need to keep cool while running on fumes?

As a general rule, opening your windows is the more efficient option if you're driving at town speeds – up to around 30mph. At this speed, the extra aerodynamic drag caused by the open window is small enough that it'll have a minimal impact on economy.

As speeds rise, however, air conditioning becomes the more efficient option. Your car's engine has to spin a pump for your A/C to work, which leads to a small increase in fuel consumption. That small increase is outweighed, however, by the aerodynamic drag that an open window causes at motorway speeds, so is the more efficient option on faster roads.

Have a plan in case of emergency

Man looks concerned while checking under his car's bonnet while on the phone

Summer driving is generally risk free but, like any time of year, there's always a tiny chance you could find yourself stranded if your car breaks down. Without the protection of your car's sunshades and air conditioning, you might have to face hot conditions for a while if you're waiting for a recovery truck. Making a few simple plans in case of emergency can help keep you safe should something go wrong.

Keeping a few bottles of water in your car is a good first step to battling the elements if you're stuck somewhere hot for an extended period. It's also a good idea to keep a portable phone charger on you if you need to call in a tow – batteries don't tend to last as long in the heat so having some extra electrons to hand can save you a headache down the line.

Keep cool in a nearly new car

Check out Motorpoint's huge selection of used cars, all with low mileage, warranty cover and big savings against the brand-new list price. For more seasonal driving advice, take a look at our guides to driving in icy conditions and what to do when aquaplaning. To really make the most of the hot weather, see our picks for the best convertible cars you can buy.

Driving in hot weather FAQs