Sri Lanka is poised for a significant shift in its weather patterns, with the Department of Meteorology (DMC) forecasting the development of favourable atmospheric conditions leading to widespread afternoon thundershowers across most parts of the island from October 1st. The latest general weather forecast, valid for the next 36 hours, was issued by the National Meteorological Centre’s Forecasting Division on 29th September 2026
Anticipated Rainfall and Affected Regions
According to the DMC’s update, regions including the Uva, Eastern, and Central provinces, along with the Polonnaruwa and Mullaitivu districts, are highly likely to experience rain or thundershowers at many places after 1:00 PM. Residents in these areas should prepare for potentially intense rainfall, as some locations could receive “fairly heavy rain” exceeding 50 mm.
Coastal areas of the Western Province, as well as the Galle and Matara districts, are expected to experience light rain during the morning hours. This localized rainfall will precede the more widespread afternoon activity.
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Morning Fog and Public Safety Advisory
Early morning commuters and residents in parts of the Sabaragamuwa and Central provinces should be aware of misty conditions. The DMC anticipates foggy weather in certain areas during the early hours.
Crucially, the public is strongly advised to take necessary precautions to mitigate potential damage from strong winds and lightning strikes that typically accompany thundershowers. These temporary but potent weather phenomena can pose significant risks, and preparedness is essential for safety.
The Department of Meteorology classifies rainfall amounts as follows: Light (00-12.5 mm), Light to moderate (12.5-25 mm), Moderate (25-50 mm), Fairly Heavy (50-100 mm), Heavy (100-150 mm), and Very Heavy (150 mm or more).
Residents are encouraged to stay updated with the latest weather advisories from the Department of Meteorology and to take appropriate measures to ensure their safety and minimize potential disruption during the anticipated weather changes.
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