Calderdale woke to the hottest temperatures of the year, with the heatwave set to last for the rest of the week.
Many have been enjoying the soaring temperatures in parks and around town centres.
But the soaring temperatures could pose a risk to health, increasing the risk of dehydration, heat exhaustion and heat stroke.
Children, young babies and the elderly are particularly vulnerable.
Public Health England has issued advice on how people can stay safe in the high temperatures:
• Try to stay out of the sun between 11am and 3pm.
• Protect against sunburn and use on sunscreen of at least SPF15 with UVA protection.
• Wear sunglasses with UV protection to prevent damage to your eyes.
• Wear light, loose-fitting clothing and a hat to keep cool.
• Quench a thirst and drink plenty of cold fluids. If you feel dizzy or develop a headache try and rehydrate, using rehydration sachets from a pharmacy if necessary.
• Do not do too much exercise - use the hot weather as an excuse to take a day off.
• Never leave anyone or an animal in a closed, parked car.
• Keep your house airy - close curtains when the sun is shining and open windows during cooler parts of the day and at night. Turning off non-essential lights and electrical items will also help lower the temperature.
• Muslims observing Ramadan should take extra care and drink plenty of water between fasts.
• St John Ambulance advises anyone who feels unwell during the hot weather to get somewhere cool and rehydrated as soon as possible, and see a doctor if this does not help.