After the heatwave of recent days the weather is expected to break, with thunderstorms and heavy rain forecast.
The Met Office have issued a 'Yellow Alert' valid from late today through until Wednesday night, with all but some northwestern areas of the UK come under a "much increased risk of seeing thunderstorms or longer spells of thundery rain, with some torrential downpours in places".
The Met Office said: "The peak risk transfers northeastwards with time and will probably be clear of most southern and western areas of Britain by the start of Wednesday.
"The public should be aware of the risk of localised disruption to travel, and more generally to summer holiday activities, due to (for example) surface water flooding.
"An area of low pressure is expected to increasingly interact with the plume of hot, humid air resident across parts of southern Britain. Whilst preceding days will have seen relatively isolated thunderstorms, the developing set-up on Tuesday and Wednesday, provides the ingredients for more widespread and energetic storms.
"Large rainfall totals, falling in short periods (perhaps exceeding 50 mm in three hours) and onto hard-baked ground, may lead to flooding locally, with hail and gusty winds an additional possibility.
"As is common in such situations, not everywhere will catch the heaviest of the storms, and some places may well escape altogether. The Alert intentionally covers a broad area at present, to cater for the uncertainties in the thundery focus, as signposted by various available computer model output. As such, further updates to the area are highly likely."
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