Colombo, Sri Lanka – 03 October 2026 – The Department of Meteorology (DMC) has issued its latest weather forecast for Sri Lanka, predicting widespread rains and thunderstorms across several provinces for Saturday, October 4th, 2026. The advisory, released at 2:00 PM today, October 3rd, urges the public to take necessary precautions against potential impacts from severe weather conditions.
Inland Weather Outlook for October 4th
According to the National Meteorological Department’s forecast division, most parts of the island nation are likely to experience rain or thundershowers at many places after 1:00 PM on October 4th. Of particular concern are the Central, Sabaragamuwa, Western, Southern, Uva, North Western, and North Central provinces, where fairly heavy rainfall exceeding 75 mm is anticipated in some areas.
During thundershowers, temporary strong winds and lightning strikes are a significant possibility. The DMC has specifically cautioned the public to take adequate pre-cautionary measures to minimize potential harm caused by these weather phenomena. Furthermore, misty conditions are expected in some areas of the Central, Sabaragamuwa, and Uva provinces during the early morning hours.
Marine Weather Forecast for the Next 24 Hours
The forecast also extends to the sea areas around the island for the next 24 hours, valid from 2:00 PM on October 3rd, 2026:
- Rainfall: Rain or thundershowers are likely to occur at several places in the sea areas off the coast extending from Mannar to Matara via Puttalam, Colombo, and Galle, particularly in the evening or night.
- Winds: Winds in the sea areas around the island will be south-westerly, with speeds expected to range between 20-30 kmph.
- Sea State: The sea areas around the island are expected to be generally normal.
However, during thundershowers, sea areas can experience temporarily strong gusty winds, reaching speeds of 60-70 kmph. These conditions are expected to make the sea areas very rough. Mariners and coastal communities are advised to remain vigilant.
Understanding Rainfall Categories
For public clarity, the Department of Meteorology categorizes rainfall amounts as follows:
- Light Rain: 00-12.5 mm
- Light to Moderate Rain: 12.5-25 mm
- Moderate Rain: 25-50 mm
- Fairly Heavy Rain: 50-100 mm
- Heavy Rain: 100-150 mm
- Very Heavy Rain: 150 mm or more
Residents across the affected provinces and those venturing into the sea are strongly encouraged to stay updated with the latest weather advisories from the Department of Meteorology and to exercise caution to ensure their safety and well-being.
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