Winds will be South-westerly and speed will be 30-40 kmph. (It can strengthen up to 70km/h during thundershowers)
Southwest monsoonal winds can strengthen up to 50-60 kmph at times over sea areas around the island particularly over the sea area extending from Puttalam to Trincomalee via Kankasanthurai and Matara to Pottuvil via Hambantota .
Therefore theses sea areas will be rough at times and may be very rough during thundershowers.