Temperatures are set to peak at 27C in Hull today - and will remain in the high twenties as East Yorkshire's heatwave continues well into next week.
Met Office forecasters say the best of Saturday's sunshine will be across lunchtime. It will be cloudy this evening but sunshine should break through again on Sunday afternoon. It will be slightly cooler on the coast.
A heat wave alert was issued for East Yorkshire yesterday as temperatures soared to 28C.
The level three alert is the second highest the Met Office can issue.
A spokeswoman said: "This very warm weather is set continue into next week.
"There are health concerns associated with this hot weather and we would urge people to keep up-to-date with the forecast.
"It will be slightly cooler on Sunday, but on Monday the temperature will rise again. There will be more cloud again on Tuesday."
The heatwave has seen a spike in 999 calls, according to Yorkshire Ambulance Service. Last weekend, operators were fielding four calls every minute at the busiest times. Now, the service is asking people to take sensible precautions to avoid suffering in the heat.
David Williams, acting director of operations said: "With such beautiful weather lots of people were understandably out and about and enjoying themselves but alongside our normal 999 demand and the increase in weather-related illnesses and injuries led to a significant rise in the number of calls that we had to deal with.
"As the hot weather brings genuine life-threatening issues for a number of people with long-term conditions, such as breathing difficulties for those with asthma, it is vital that we are able to deal with these calls quickly rather than responding to people with preventable illnesses or injuries.
"As always, our staff will be working hard to get to patients who require an emergency medical response as quickly as possible but we do ask that people only call 999 for an ambulance in a medical emergency when it is obvious that someone has a life-threatening illness or injury.
"The last thing we want to do is stop people enjoying the wonderful weather, but we must ask everyone to use common sense to avoid putting themselves and others at risk whilst leaving our valuable resources available to respond to those who need us most quickly."
The service advises:• Drinking plenty of water;• Using sun cream, wearing a hat and keeping cool by staying in the shade between 11am-3pm; • Looking out for those who are more at risk from the heat than others - for example, older people, babies and young children, and people with any pre-existing medical problems that can affect their breathing; • Avoiding drinking too much alcohol in the sunshine;• Contacting a doctor, pharmacist or NHS 111 if you are worried about your health;• Calling 999 for an ambulance only in a genuine emergency.
Public Health England has also issued advice about the hot weather.
Dr Angie Bone, Heatwave Plan lead for PHE, said: "While many people enjoy hot weather, high temperatures can be dangerous, especially for people who may be particularly vulnerable such as older people, young children and those with serious illnesses.
"Everyone can enjoy the sun safely by keeping out of the heat at the hottest time of the day, avoiding sunburn and staying hydrated with plenty of cool drinks.
"The elderly and those with long-term illnesses are particularly vulnerable to the effects of very hot weather, so it's important to look out for them and keep indoor areas as cool as possible."
The highest confirmed temperature of the year so far was 29.9C, recorded at Edenfel, County Tyrone in Northern Ireland, on Monday July 8.
• Five-day weather forecast: hulldailymail.co.uk
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