It said: “The rains will increase in intensity from moderate to heavy rains between round 1200 and midnight.
“Areas around Jalingo, Yola and Mambila Plateau may experience some morning thunderstorms.
“Day and night temperature in the region is expected to be in the range of 25-31 degree Celsius and 17-23 degree Celsius respectively.”
The agency added that light rains is expected in the morning hours over Lagos, Port Harcourt, Calabar, Eket, Enugu and other southern cities with drizzle in a few places.
It said that the rains would graduate to heavy rains over most parts of the southern states in the evening hours, adding that the heavy rains expected to be all-day affair might still be light over Lagos.
NiMet predicted that day and night temperature in the southern region will be in the range of 28-30 degree Celsius and 21-24 degree Celsius respectively.