Weather in Sri Lanka for September 2025
In general, the average temperature in Sri Lanka at the beginning of September is 27.6 °C. As the month progressed, temperatures tended to moderately rise, reaching an average of 28.4 °C by the end of September.
Sri Lanka experiences heavy rainfall in September, with over 20 rainy days and an average total precipitation 611.9 mm.
Is September a good time to visit Sri Lanka? check out the best time to travel to Sri Lanka page.
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Sri Lanka in September average weather
| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  27° | 2  27° | 3 27° | 4 28° | 5 28° | 6 28° | 7 28° |
| 8 28° | 9 28° | 10 27° | 11 27° | 12  28° | 13  29° | 14  28° |
| 15 28° | 16  29° | 17 29° | 18 29° | 19 29° | 20 27° | 21 28° |
| 22 28° | 23 28° | 24 29° | 25 28° | 26 29° | 27 28° | 28 28° |
| 29 29° | 30 28° |
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Temperatures trend during September in Sri Lanka
September weather day by day
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. | Moderate or heavy rain shower | 27° /24° | 33.9 mm | 6 | |
| 2 Sept. | Torrential rain shower | 27° /24° | 41.4 mm | 6 | |
| 3 Sept. | Torrential rain shower | 27° /24° | 48.3 mm | 6 | |
| 4 Sept. | Moderate or heavy rain shower | 28° /24° | 27.1 mm | 6 | |
| 5 Sept. | Torrential rain shower | 28° /25° | 38.6 mm | 6 | |
| 6 Sept. | Moderate or heavy rain shower | 28° /25° | 34.3 mm | 6 | |
| 7 Sept. | Moderate or heavy rain shower | 28° /24° | 34.2 mm | 6 | |
| 8 Sept. | Moderate or heavy rain shower | 28° /24° | 28.3 mm | 6 | |
| 9 Sept. | Moderate or heavy rain shower | 28° /24° | 35.3 mm | 6 | |
| 10 Sept. | Moderate or heavy rain shower | 27° /24° | 28 mm | 6 | |
| 11 Sept. | Torrential rain shower | 27° /24° | 31.4 mm | 6 | |
| 12 Sept. | Cloudy | 28° /24° | 3.6 mm | 6 | |
| 13 Sept. | Overcast | 29° /25° | 5.2 mm | 7 | |
| 14 Sept. | Partly cloudy | 28° /24° | 9.9 mm | 7 | |
| 15 Sept. | Cloudy | 28° /25° | 8.3 mm | 6 | |
| 16 Sept. | Patchy rain possible | 29° /25° | 10.3 mm | 6 | |
| 17 Sept. | Light rain shower | 29° /25° | 12.1 mm | 6 | |
| 18 Sept. | Light rain shower | 29° /24° | 10.9 mm | 6 | |
| 19 Sept. | Light rain shower | 29° /24° | 10.4 mm | 6 | |
| 20 Sept. | Moderate or heavy rain shower | 27° /24° | 21.7 mm | 6 | |
| 21 Sept. | Light rain shower | 28° /24° | 9.6 mm | 6 | |
| 22 Sept. | Light rain shower | 28° /24° | 8.9 mm | 6 | |
| 23 Sept. | Light rain shower | 28° /25° | 8.9 mm | 6 | |
| 24 Sept. | Patchy rain possible | 29° /25° | 16.7 mm | 6 | |
| 25 Sept. | Light rain shower | 28° /25° | 16.7 mm | 6 | |
| 26 Sept. | Light rain shower | 29° /24° | 14.1 mm | 6 | |
| 27 Sept. | Light rain shower | 28° /25° | 21.7 mm | 6 | |
| 28 Sept. | Light rain shower | 28° /24° | 15.3 mm | 6 | |
| 29 Sept. | Light rain shower | 29° /24° | 14.4 mm | 7 | |
| 30 Sept. | Light rain shower | 28° /24° | 12.3 mm | 6 | |
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Guide for Sri Lanka in September
In September, Sri Lanka experiences varying weather conditions at the beginning and end of the month.
At the start of September, the weather in Sri Lanka is generally warm and humid, with temperatures ranging from 27° to 30° in the coastal areas and slightly cooler temperatures in the central highlands.
The coastal regions may also experience occasional short bursts of rain, particularly in the evenings, due to the inter-monsoon period.
Towards the end of September, the weather in Sri Lanka begins to transition as the southwest monsoon season approaches. During this time, the country experiences increased rainfall, particularly in the southwestern regions, with temperatures ranging from 25° to 28°.
The central highlands also receive a fair amount of rainfall, making it a great time to witness the lush greenery and vibrant landscapes.
Overall, September in Sri Lanka offers a mix of warm temperatures, occasional rain showers, and lush greenery, making it an ideal time to explore the diverse landscapes and cultural attractions that the country has to offer.
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Sri Lanka in September - FAQ
What to pack to Sri Lanka in September?
As you prepare for your trip to Sri Lanka in September, it's important to consider the typical weather patterns for the time of year. Below is a carefully tailored packing list to ensure that your time in Sri Lanka, during September, is comfortable and enjoyable, regardless of the weather conditions.
- Clothing
- Lightweight Clothing: T-shirts, blouses, shorts, skirts
- Rain Gear: Lightweight, waterproof clothing
- Footwear
- Waterproof Shoes
- Accessories
- Sunglasses: For sun protection
- Sun Hats: Wide-brimmed hats for sun protection in warm weather
- Umbrellas/Raincoats: For rainy days
- Personal Items
- Sunscreen: High SPF for sunny destinations
- Lip Balm with SPF: To protect against chapped lips
September rainfall patterns in Sri Lanka
UV exposure in Sri Lanka during September
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