For the South, generally cloudy conditions are expected, with chances of light morning rainfall in parts of Edo, Cross River, Delta, Bayelsa, Akwa Ibom and Rivers states.
NiMet said thunderstorms accompanied by moderate rainfall were expected across the entire southern region later on Wednesday.
The agency advised residents in areas expecting thunderstorms to exercise caution, warning that strong winds could precede rainfall.
It urged residents to secure loose objects that could be blown away by strong winds or cause injuries.
NiMet also warned that prolonged rainfall, particularly in coastal areas of the South, could trigger flash flooding.
The agency advised motorists to avoid driving or wading through floodwaters and to avoid driving during heavy rainfall.
It further advised residents to disconnect electrical appliances from sockets and stay away from tall trees because of the risk of falling branches.
Airline operators were also urged to obtain airport-specific weather information from NiMet to support operational planning.
The agency encouraged members of the public to monitor its regular weather updates and consult its official channels for further information.
