“Latest indications are that the most intense rainfall may be expected across parts of southeast England and the southern portion of East Anglia during the afternoon, as brightening skies supply extra energy, leading to development of slow-moving thundery showers”.

“These will be gradually replaced by more persistent and often heavy rainfall overnight and during Sunday morning, as an area of low pressure develops and causes the frontal band to pivot close to South West England”.

The Met Office said some areas could be hit by up to 60mm of rain in the space of just a few hours.

The city is on the edge of the area the Met Office believes will be affected by the bad weather.

The south-east of England and East Anglia are likely to suffer the worst of the rain on Monday, a Met Office spokesman said, as the front bringing it stalls because of a lack of wind.

The Met Office has issued a yellow weather warning – meaning you should be aware of a risk of disruption and potentially flooding in some areas. There were also heavy rain in Exeter (33.2mm), Bournemouth (26.4mm) and Gogerddan in south west Wales (25.8mm). The yellow warning covers all of Devon until 6pm tomorrow.

Forecasters said heavy thundery downpours are sweeping across the country.

‘We could see another 20mm of rain, so for a lot of areas that is a third of a month’s rain.

He added: “There is the possibility of disruption”.

The rain will not move west into the North Sea until around midnight, he said.

However, the warm weather is unlikely to make a return this week with forecasters warning of more rain for southern Britain on Tuesday and Wednesday.