Clouds have moved in overnight, with showers and heavy cloud cover early in the morning in the east of the country. The south and west should remain dry.
By mid-morning Sunday, most of the country can expect sunshine, with the occasional shower across some parts of England and Wales, reaching Scotland by the evening.
The southeast should prepare for another scorcher, with peaks of 35C likely, while Glasgow and Belfast will hover around 20C.
By the evening, showers will begin to break out across the country, with thunderstorms expected in parts. The north of Scotland should stay dry.
Looking towards the beginning of next week, the heatwave is set to continue in the southeast, while thunderstorms intensify.
The Met Office has issued yellow weather warnings for Monday to Wednesday, with thunderstorms likely across several parts of the UK.
Despite the thundery showers, northwest Scotland, far eastern and southeastern England will likely have another pleasantly sunny day Monday, while the south should prepare for yet more sweltering weather as the heatwave stretches into next week.
The southeast can expect the record temperatures to last until midweek, while storms intensify from Tuesday onwards.
The Met Office has advised people to be aware of the risks associated with heatwaves, including dehydration, overheating and heatstroke.
People are advised to drink plenty of fluids and avoid excess alcohol, look out for people who may be more vulnerable to the heat, and wear sun cream and a hat when outdoors.
Coronavirus restrictions remain in place, so all public spaces should be used in line with government guidance around social distancing.
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