The hot weather which has baked the UK over the last few days is set to continue on Wednesday, with scattered thunderstorms also forecast to return.
The Met Office says the mercury is expected to push 30C (86F) across southern and western England and 25C (77F) in Belfast, with temperatures forecast to be slightly cooler in the east.
It comes after England reached it s hottest temperature of the year on Tuesday - 32.2C (89.96F) recorded at Heathrow Airport in west London.
READ MORE : Met Office issues warning for 11-hour thunderstorms
An amber extreme heat warning remains in place for central and southern England, Wales and Northern Ireland.
But Brits seeking a form of respite by using their electric fans have been issued a warning.
** Do you have any tips for staying cool in the heat? Tell us via the comments
According to some experts, keeping a fan on overnight may have several cons that you may want to be aware of to protect your health, reports the Mirror.
Sleeping with a fan may in fact end up circulating not just air but also pollen and dust too, which isn't ideal for those suffering from allergies or asthma, Sleep Advisor reports.
The Sleep Advisor said: "Take a close look at your fan.
"If it’s been collecting dust on the blades, those particles are flying through the air every time you turn it on."
Your skin may also suffer from the fan being on all night as it can dry it out. That while a fan also has the potential to dry up your nasal passages, resulting in your body producing excess mucous and you waking feeling all blocked up.
Sleep Advisor also warned the cool air could result in you waking up in the morning feeling stiff.
They explained: "This is because the concentrated cool air can make muscles tense up and cramp."
The Met Office warned the hot weather would likely put the most vulnerable at risk, while the wider population are likely to experience some adverse health effects including sunburn or heat exhaustion (dehydration, nausea, fatigue) and other heat-related illnesses.
