Mainly fair weather will prevail over most parts of the island.

Condition of Rain:
Mainly fair weather will prevail over the sea areas around the island.
Winds:
Winds will be north-westerly or south westerly and the wind speed will be (20-40) kmph. 
State of Sea:
The sea areas off the coast extending from Kankasanturai to Trincomalee via Mullaitivu and from Colombo to Hambantota via Galle and Matara will be fairly rough at times. 

Source – DOM