Deadly rains that pummelled China's capital in recent days were the heaviest since records began 140 years ago, the city's weather service said on Wednesday.

"The maximum (amount) of rainfall recorded during this storm, which was 744.8 millimeters, occurred at the Wangjiayuan Reservoir in Changping," the Beijing Meteorological Service said.

It was the "heaviest rainfall in 140 years", when Beijing records began, it added.

The largest volume previously recorded was 609 millimeters in 1891, the service added.

Storm Doksuri, a former super typhoon, swept northwards over China after hitting southern Fujian province last week, following its battering of the Philippines.

Heavy rains began pounding the typically dry capital and surrounding areas Saturday.

The amount recorded in just 40 hours neared the average rainfall for the entire month of July.

State media warned last week that 130 million people would be affected by the extremely heavy rainfall across northern China.

Swathes of suburban Beijing and surrounding areas remain badly hit by the rains, with state media reporting 974,400 people have been evacuated in the capital and neighboring Hebei province.

However authorities in the capital lifted the red alert for flooding on Wednesday morning "as the water flow in major rivers has gone below the warning mark", Xinhua reported.