It has issued gale warnings for the Yangtze river delta region, which includes Shanghai.
China's National Meteorological Center issued a red alert for Zhejiang province on Friday days after the State Flood Control and Drought Relief Headquarters issued written caution to a total of seven provinces.
Heavy rains will fall on Taiwan, central and eastern Zhejiang, Shanghai, eastern Jiangsu, eastern Shandong and Liaodong peninsulas, through Sunday.
More than 300 flights to and from Taiwan have been cancelled and cruise liners have been asked to delay their arrival in Shanghai. Further east, Typhoon Krosa is spreading heavy rain across the Northern Mariana Islands and Guam.
Lekima strengthened into a typhoon Wednesday morning.
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Lekima passed by Japan's Ryukyu Islands on Thursday and continued northwest on Friday, cutting power to about 14,000 homes, broadcaster NHK reported.
On Friday, the island suspended classes and closed offices.
The notice reminded all districts to check underground spaces including garages, shopping malls, construction sites, and entrances and exits of rail stations to reinforce advertising billboards, air conditioners and decorations on high buildings, particularly in commercial and crowded places, to withstand strong winds.
The island's authorities issued landslide warnings after an natural disaster of magnitude 6 struck its northeastern coast on Thursday, hours before the typhoon approached, which was forecasted to bring rainfall of up to 900 mm (35 inches) in its northern mountains.
It is forecast to make landfall off the coast of Zhejiang Province (China) on 9 August afternoon with maximum sustained winds up to 190 km/h (Category 3).
The country has a four-stage colour-coded warning system, with red representing the most severe weather.