One month of rain will hit the UK tomorrow before a heatwave arrives, forecasters have predicted.

A yellow weather warning has been issued by the Met Office for rain tomorrow which covers the south west of England and all of Wales.

Downpours are 'expected to become widespread and heavy at times' throughout Friday.

The Met Office has been traveling on roads and railways during the afternoon and evening rush hour could be treacherous for commuters.

However it is hoped that a heatwave could arrive time for the August Bank Holiday due to ripples of a tropical typhoon which is developing over Asia.

People in the rain along the River Cam in Cambridge

It is hoped for a heatwave is on the way

The Met Office said it would 'dominate the weather across the British Isles' towards the end of the month, with 'longer spells of dry weather' and 'temperatures above average for August'.

Channel 4 weatherman Liam Dutton shared a graphic on Twitter showing the storm developing Asia, along with the caption: "A look at how to get in touch with the UK in around 10 days."

But until then, the weather is expected to continue, with forecasters predicting rain, high winds, and coastal gales for Friday.

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A woman is seen sunbathing at St James's Park

Weather experts also predict a washout this weekend, with up to 1.6in (40mm) of rain in some areas and more thunderstorms across the UK.

The average rainfall in England is only 2.72in (69mm).

Met Office Meteorologist Emma Smith said: "There's a chance the weather could be quite disruptive, just like the one just gone.

The weather warning in place tomorrow

"On Friday we could see some rain and rain over the weekend." There should be some sun and showers on Saturday, but with a risk of thunder across the country.

"The warnings we have for Saturday are for 30 to 40mm of rain in the North and Wales.

"By Tuesday and Wednesday next week we should see things settle down and western England and Wales should see some better weather.

Members of the public walk through torrential rain on Westminster Bridge

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"High pressure is in the south of the south and is likely to be affected by weather conditions particularly in South East.

"Wednesday morning, an area of ​​low pressure in the South West with high winds and outbreaks of rain across the country.

Warmer weather could be on the way

"The heaviest rain will be in northern England.

When will it warm up again?

The forecast from the Met Office looks miserable from now until next week, with heavy rain, thunderstorms, strong winds and chilly nights all expected.

Britons hoping for the return of summer-like weather.