For many, summer means spending more time outdoors – but is it still safe to go hiking during a heatwave? What are the potential health dangers of going on a hike in a heatwave? Remember to top up on sunscreenopen image in gallery (Alamy/PA) ( Alamy/PA )“When you’re out walking, you will be sweating, so remember to top up on sunscreen whenever you’re having those breaks,” recommends Twitchen. Stay hydratedopen image in gallery (Alamy/PA) ( Alamy/PA )“Take lots of water with you, more than what you would normally take,” advises Twitchen. Alternatively, if you are going on a longer hike, then you could pack big water containers or lots of smaller water bottles.”