Heavy falls (more than 100 mm) can be expected in some places particularly, in the Uva, Central, Southern and Eastern provinces, they said.
Showers will also occur along the coastal areas in the morning too.
Misty conditions can be expected in some places in the Western, Sabaragamuwa, Central and Southern provinces during the morning.
Temporary localized strong winds during thunder showers are expected and the public is requested to take adequate precautions to minimize damages caused by lightning.