Sri Lanka Weather Forecast: Heavy Rain and Strong Winds Expected as South-West Monsoon Strengthens
The South-West monsoon is gradually becoming established over Sri Lanka, bringing widespread showers, thunderstorms and strong winds to several parts of the island, according to the latest weather forecast issued at 5.30 a.m. on 23 May 2026.
The Department of Meteorology stated that showers or thundershowers will occur at times in the Western, Sabaragamuwa and North-Western provinces and in the districts of Galle, Matara, Kandy and Nuwara-Eliya. Heavy rainfall of around 100 mm is likely at some places, especially in the Western and Sabaragamuwa provinces and in Galle and Matara districts, raising the risk of localized flooding and temporary disruptions.
A few showers are also expected in the Anuradhapura district, while isolated evening or afternoon thundershowers may develop in parts of Uva province and in the Ampara and Batticaloa districts after 1.00 p.m.
In addition to the rainy conditions, fairly strong winds ranging between 30-40 kmph are expected over the western slopes of the central hills and across the Northern, North-central, North-western and Southern provinces, including the Trincomalee district. The public has been advised to take necessary precautions against strong winds, lightning and temporary localized weather hazards during thunderstorms.
Sea conditions around the island are also expected to remain unsettled over the next 24 hours. Showers or thundershowers will occur at several places in the sea areas extending from Puttalam to Hambantota via Colombo and Galle. South-westerly winds are expected to strengthen, with speeds reaching 50-60 kmph at times in the sea areas from Puttalam to Pottuvil via Colombo, Galle and Hambantota.
The Department of Meteorology warned that these sea areas could become rough, with wave heights increasing between 2.0 and 3.0 meters. Fishermen and naval communities are advised to remain vigilant, while the general public is urged to stay updated with future weather forecasts and advisories.