The storms will extend from the escarpment to the coast.
SA Weather spokesman in Nelson Mandela Bay, Garth Sampson, said: “The weather over the Eastern Cape today still looks favourable for thunderstorm development over most of the Eastern Cape in the late afternoon including the coastline.
“Severe thunderstorms are possible in places but it is difficult to pinpoint an area so far in advance.
“The public are advised to look for updates on radio, TV or on the SAWS website (www.weathersa.co.za) regarding potential severe thunderstorms.”
The province is still reeling from storm gusts which on Monday killed tavern patron Dumane Bebe, 63, and injured 80 others, including 23 children.