The Meteorology Department says showers or thundershowers may occur at a few places in Colombo, Kalutara, Ratnapura, Galle and Matara districts in the evening or night.
A few showers are likely in Ampara, Batticaloa and Hambantota districts during the morning.
Mainly dry weather will prevail in the other areas of the island, it said.
Misty conditions can be expected at some places in Western, Sabaragamuwa and Uva provinces and in Galle and Matara districts during the morning.