Drivers urged to check their cars as red weather warning issued
Consumer Editor
Content guide
Drivers are being reminded to prepare their vehicles for heatwave conditions in a bid to keep themselves and other road users safe.
The Met Office has issued a rare red weather warning for Wednesday 25th and Thursday 25th July, with extreme heat and humidity expected to have serious consequences for drivers.
Temperatures in parts of England and Wales are set to exceed 37°C in the shade, with some areas potentially reaching up to 40°C – resulting in a significant heatwave in parts of the UK.
Motorists are being warned by the RAC that the heat could directly affect both driver safety and vehicle reliability.
- Weather in the UK – forecast and data
- Summer driving tips – how to avoid a breakdown
- Extreme heat warning – should you be driving?
Fatigue, dehydration and reduced concentration are likely, even for normally healthy people, not just those most vulnerable.
Drivers are being urged to plan trips carefully, take regular breaks, and adapt their routines to avoid travelling in the hottest parts of the day.
The red warning covers areas from London to the West Country and up towards Birmingham.
For drivers, disruption could include:
- Increased likelihood of traffic and potential closures due to heat damage or incidents
- Higher breakdown rates, as extreme temperatures put extra strain on engines, batteries and tyres
- Failure of infrastructure, including power outages affecting fuel stations, traffic systems or communications
Travel disruption is also expected across rail and air networks, which could spill onto roads and worsen traffic conditions.
Dr Will Lang, chief meteorologist at the Met Office, said: “We are forecasting extreme temperatures in the next few days, particularly on Wednesday and Thursday, when it looks like we’ll be seeing maximum temperatures into the high 30s."


Roadside cover from £5.29 a month*
Cheaper than AA or we’ll beat it by 20%^
- Cheaper than AA Price Promise^
- We get to most breakdowns in 60 mins or less
- Our patrols fix 4/5 breakdowns
*At least 10% of new customers pay this for single-vehicle Roadside (Basic). ^T&Cs apply.
*At least 10% of new customers pay this for single-vehicle Roadside (Basic). ^T&Cs apply.
Emergency breakdown kit – what to carry in your car in a heatwave
- Plenty of water for the driver and all passengers
- Snacks that won’t melt or go off in the heat – in a coolbox if you have one
- Hats and umbrellas to shield from the sun
- Sunscreen
- Emergency medication if needed
- A fully charged mobile phone
- Download and login to your breakdown service’s app, such as myRAC, to reach help as quickly as possible (this can also help your provider with locating your vehicle)
- A means of keeping pets secure if you must leave your car – and sufficient food and water for them
Warnings for drivers during a heatwave
RAC road safety spokesperson Rod Dennis said: "Red extreme heat warnings are rare and we urge everyone to take them seriously this week.
“Drivers whose vehicles don't have effective air conditioning should strongly consider postponing any non-essential car journeys until the Met Office’s weather warnings are lifted and temperatures drop.
“If this isn’t possible, our best advice is to travel during cooler times of day. This is especially important for anyone travelling with vulnerable people, including young children and older adults, who are at greater risk from the intense heat. We'd also remind motorists never to leave pets inside a hot vehicle, as doing so can quickly become fatal.
“This week could end up being a record-breaking one for June - not just because of the heat, but also for the number of drivers breaking down. Our last busiest June was three years ago, but there’s every chance that could be eclipsed this week as temperatures soar. Today, we expect breakdown volumes to be around 20% higher than what’s normal for a Monday in late June.
- How to check your engine coolant
- Air-con regassing: everything you need to know
- Dashboard warning lights: what they mean & what to do"
“We ask anyone who breaks down to be patient while breakdown providers prioritise the most urgent roadside jobs. The heatwave will affect services right across the UK and while all patrols will be working incredibly hard to assist drivers, longer waits are more likely. Staying safe in the heat is paramount, so we strongly recommend packing an emergency breakdown kit (see below) and waiting in the shade wherever possible.
“There are simple steps motorists can take to reduce the risk of a breakdown in the first place, however. It begins with a few basic checks under the bonnet before setting out. Make sure oil levels are sufficient and top up if needed. Coolant should also sit between the ‘min’ and ‘max’ markers - if it isn't, top it up yourself when the engine is cold and have it inspected by an RAC mobile mechanic or reputable garage as soon as possible.
"At these kinds of temperatures, road surfaces will soften, with darker patches of tarmac often the clearest indicator. Drivers may therefore see councils deploying gritting vehicles - a sight normally reserved for the winter - as applying a fine layer of granite dust can help maintain traction on melting roads. Motorists also shouldn’t be concerned if they spot water beneath their vehicle, as this is typically just condensation from the air conditioning system."


Get your car serviced or repaired at home
RAC Mobile Mechanics can come to you, saving you the hassle of going to a garage.
RAC’s top tips to keeping your car cool in a heatwave
- Don’t leave home without an emergency breakdown kit - see below
- Park in the shade. This is a simple solution that's often overlooked by drivers. But keeping your car out of direct sunlight is one of the best ways to keep the interior cool in the summer
- Cover the seats with a blanket or jacket. If your vehicle has leather seats then the summer sun will transform the surface of the seat into a hotplate. Keep them cool by covering them up, especially if you have to park in direct sunlight
- Learn how to use your car's air conditioning system. Do you really understand how your vehicle’s air con or climate control system works? Check the owner’s manual to fully understand how it operates and what setting(s) you need to use to cool the car’s interior quickly and effectively in the summer
- Carry water and soft drinks at all times. Keep a spare bottle of water and one or two soft drinks in your car at all times. Dehydration can impact your concentration and awareness levels, presenting a danger to drivers in hot weather conditions
- Keep a cool bag/box in your car. This will keep drinks and snacks cool in a heatwave and ensure you can properly hydrate and have a refreshing, cool snack


Roadside cover from £5.29 a month*
Cheaper than AA or we’ll beat it by 20%^
- Cheaper than AA Price Promise^
- We get to most breakdowns in 60 mins or less
- Our patrols fix 4/5 breakdowns
*At least 10% of new customers pay this for single-vehicle Roadside (Basic). ^T&Cs apply.
*At least 10% of new customers pay this for single-vehicle Roadside (Basic). ^T&Cs apply.
You might also like

Five surprising things your car does in summer
Liquid dripping from your car, strange noises from the engine, and more. Find out 5 things your car does in summer and whether they're normal.

Cabin and pollen filters – get your car ready for the summer
Drivers should be getting their air conditioning in full working order. This guide looks at everything you need to know about cabin and pollen filters.

When do the clocks change?
Twice a year the clocks in the UK change, moving an hour forward and then one hour back. Learn how this affects drivers - both in the UK and in Europe.

The quickest way to cool your car down
Find out the fastest way to cool down your car on the hottest days of the year – follow our no-sweat guide.

Air-con regassing: everything you need to know
Is your car's air-con not working as it should? You can repair your vehicle's air-con with a simple regas. Read our guide to find out more.
Popular in News
1
EV car batteries last longer than expected, according to new study
2
Vehicle breakdowns where poor roads were to blame rose 15% last year
3
Vaping in cars with children could be banned
4
Graduated driving licences set to be introduced in Northern Ireland
5
Quarter of drivers say they’ve suffered vehicle crime
6
More than 2,500 motorists caught drink-driving three or more times in the last 11 years
7
Government extends home EV charger grant to 2027
8
Four-in-five drivers concerned about dazzling headlights as darker evenings arrive
9
Council pothole claims rise by 90% in three years
10




