The agency predicted thunderstorms over parts of Sokoto, Zamfara, Kebbi, Katsina, Kano, Jigawa, Yobe, Borno, Taraba and Adamawa states later in the day.
It forecast a cloudy atmosphere with sunshine intervals over the North Central region in the morning hours.
The agency anticipated thunderstorms over parts of the Federal Capital Territory, Kogi, Kwara, Niger and Plateau states.
“Cloudy atmosphere is expected over the inland states of the South and the coastal areas, with chances of thunderstorms over Oyo, Ogun and Lagos states in the morning hours.
“In the afternoon and evening hours, thunderstorms are anticipated over the entire region,” it said.
According to NiMet, in areas where thunderstorms are expected, strong winds are likely to precede the rains, and as such, trees, electric poles, unsecured objects and weak buildings may be felled.
“So the public is advised to be cautious. Stay in-door especially during heavy rainfall to avoid being struck by lightning.
“All airline operators are advised to avail themselves of weather reports periodically from NiMet for effective planning in their operations.
“Moderate to heavy rainfall could lead to flash floods. The public is advised to take necessary caution.
“Disaster risk managers, agencies and individuals should be proactive, to avert loss of lives and property during rainy season,” it added.