# SRI LANKA WEATHER FORECAST FOR 21 SEPTEMBER 2026

- Link: https://www.weather.lk/sri-lanka-weather-forecast-for-21-september-2026/
- Published: 2026-09-20T18:43:57+05:30
- Author: WeatherLK

Sri Lanka is expected to experience continued rainy weather on 21 September, particularly
across the southwestern parts of the island, as a low-pressure area develops over
the Bay of Bengal. The system has formed northeast of Sri Lanka near the Andaman
region and is not expected to have a direct impact on the island. However, winds
flowing toward the developing system are expected to maintain the prevailing wet
conditions over several areas.

Showers or thundershowers will occur at times in the Western, Sabaragamuwa and North-
Western provinces, as well as in the Galle, Matara, Kandy and Nuwara-Eliya districts.
Heavy rainfall exceeding 100 mm is possible at some locations in these areas. Several
spells of showers may also occur in the North-Central Province and Mannar district.

Meanwhile, showers or thundershowers are expected at several places in the Uva Province
and in the Batticaloa and Ampara districts after 2.00 p.m. Fairly strong winds of
around 30–40 kmph may occur at times over the western slopes of the Central hills,
North-Central and North-Western provinces, as well as in Trincomalee, Hambantota
and Matale districts.

The public is advised to take adequate precautions against temporary localized strong
winds and lightning during thundershowers.

![](https://meteo.gov.lk/gifs/analysis1.gif?t=1789909485168)

### **Sea Areas Around Sri Lanka**

The low-pressure area over the Andaman Sea is expected to intensify during the next
few days. As a result, wind and rainy conditions over the Bay of Bengal are expected
to increase. Naval and fishing communities operating in these sea areas are advised
to remain vigilant and follow future forecasts and bulletins issued by the Department
of Meteorology.

Showers or thundershowers will occur at times in the sea areas extending from Kankasanthurai
to Hambantota via Puttalam, Colombo and Galle. Showers or thundershowers may also
occur in several other sea areas during the evening or night.

South-westerly winds will prevail, with speeds of 30–40 kmph. Wind speeds may increase
up to 50–60 kmph at times in the sea areas from Matara to Pottuvil via Hambantota.
Winds may also reach 50 kmph at times from Puttalam to Kankasanthurai via Mannar.

Sea conditions will be rough at times from Matara to Pottuvil via Hambantota and
fairly rough from Puttalam to Kankasanthurai via Mannar. Wave heights may increase
to around 2.0–2.5 metres in the sea areas extending from Puttalam to Pottuvil via
Colombo, Galle and Matara. Temporarily strong gusty winds and very rough seas are
possible during thundershowers.

![](https://meteo.gov.lk/gifs/marine1.gif?t=1789909549160)