In England, a flood watch is in place for the Tidal Thames Riverside from Putney Bridge to Teddington Weir, and river levels are expected to be high as a result of spring tides.
In Scotland, a flood warning has been issued for the Churchill Barriers, with a combination of high tides and strong wind creating a high risk of breaking waves and dangerous conditions.
Road closures in the area are likely around high tide.
Later in the week, it looks like the UK will split along weather lines as the south continues to bask in summer sunshine while the north battles heavy downpours and cooler temperatures.
This week’s heat wave will end abruptly over the weekend when storms and heavy rains begin, however early next week warm temperatures and sunshine will return to the south of the country.
However, in the north the rains seem to be more frequent with a northwest wind that lowers the temperature below normal for the time of year.
According to the Met Office, the weekend will be: “Central parts cloudy with spurts of rain, becoming increasingly heavy with a risk of thunder.
“It will probably stay dry and hot in the far south with some sun. Sun and showers to the northwest.
Rain appears likely across the country on Sunday, but the south is forecast to remain dry Monday and Tuesday as rain spreads to the northwest.
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“Over the weekend, the most likely scenario is for clear, sunny periods with occasional showers.
“Rains may be more frequent in the north and west initially, then north and east later, and could be locally heavy.
“Temperatures near or slightly below normal under a north-northwesterly breeze.”