The sweltering weather has caused predicted car congestion close to Formby beach with an unofficial parking zone opened and tickets for illegally parked vehicles.
England is seeing the hottest day of the year this weekend as the skies finally cleared after weeks of wet and humid weather with the temperature reaching 25 C degrees in Sefton, and set to rise further into into the afternoon.
The official beach park is already full, and now closed for the day.
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But an unofficial car park has emerged on a patch of land on Victoria Road, at a cost of £10.
Vehicles left on nearby Gorse Way have been given penalty notices with a lot of pavement parking on other surrounding streets, some on double yellow lines.
Many parts of the UK could be in for a mini-heat wave - defined as a period of three days or more above a certain threshold.
The balmy weather, driven by a blast of warm air coming in from the Azores in the North Atlantic, has prompted health officials to issue warnings about the dangers of extreme heat.
The sunshine is due to last until so-called "Freedom Day" on Monday, the day when the last of the Covid-19 restrictions are due to be lifted.
The Met Office forecast for the northwest of England is a "fine, dry day with plenty of sunshine, but becoming a little breezier in the far north during the afternoon.
"Feeling very warm in the sunshine, and hot in places. Maximum temperature 28 °C.
"Tonight: Staying fine and dry with long clear periods.
"There is the likely potential for low cloud or fog to form overnight in places, especially further west.
"Feeling mild. Minimum temperature 12 °C."
Met Office meteorologist Simon Partridge said the weather may take people by surprise "because so far this summer has not been that great".
He added: "Temperatures have generally been below average for quite a while - it's the difference in temperature in such a short space of time that is the most noticeable.
"But it will affect most of the UK and that is a little bit more unusual - Scotland and Northern Ireland just got their warmest day of the year.
"Northern Ireland might get closer to its highest-ever temperature, which to be fair is only just above 30C."
But a mini-heat wave is definitely on the cards, the Met Office said, before things turn cooler and thundery from the middle of next week.
Warnings about the extreme heat have been issued by both medical authorities and vets, urging people to keep the vulnerable and animals safe.
PHE advised people to look out for those who may struggle to keep cool and hydrated, such as older people and those who live alone.
Emergency animal care provider Vets Now also warned rising temperatures could increase the risk of heat stroke in dogs.
