Negombo
September
Weather in Negombo for September 2026
Your guide to Negombo weather in September - trends and predictions
So far, September 2026 in Negombo is slightly warmer than the historical average by 0.9 °C.
The forecast for the next days in Negombo predicts temperatures to be around 28 °C, close to the historical average.
In general, the average temperature in Negombo at the beginning of September is 29.9 °C. As the month progressed, temperatures tended to noticeably cool down, reaching an average of 27.7 °C by the end of September.
Negombo experiences heavy rainfall in September, with over 20 rainy days and an average total precipitation 292.8 mm.
Temperatures
Rain 🌧️
0
Dry days
30
Rainy days
0
Snow days
28°/25°
Temperatures
21 km/h
Avg max wind
84 %
Avg humidity
Negombo Weather September
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Temperatures trend during September in Negombo
See the weather trend as well as the moving average line
September weather in Negombo day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. |  Light rain shower | 29° /24° | 2.6 mm | 5 | |
| 2 Sept. | Patchy rain possible | 30° /24° | 1.5 mm | 6 | |
| 3 Sept. | Patchy rain possible | 30° /24° | 3.5 mm | 6 | |
| 4 Sept. | Patchy rain possible | 30° /24° | 3.1 mm | 6 | |
| 5 Sept. | Patchy rain possible | 30° /23° | 3.7 mm | 5 | |
| 6 Sept. | Patchy rain possible | 30° /24° | 1.4 mm | 4 | |
| 7 Sept. | Light rain shower | 30° /24° | 3 mm | 5 | |
| 8 Sept. |  Light drizzle | 29° /24° | 1.6 mm | 6 | |
| 9 Sept. | Patchy light drizzle | 30° /24° | 3.7 mm | 7 | |
| 10 Sept. | Light rain shower | 29° /25° | 4.6 mm | 4 | |
| 11 Sept. | Light rain shower | 30° /24° | 3.8 mm | 5 | |
| 12 Sept. | Light rain shower | 31° /24° | 7.4 mm | 5 | |
| 13 Sept. | Patchy rain possible | 29° /24° | 11.4 mm | 4 | |
| 14 Sept. | Patchy rain possible | 30° /24° | 14.2 mm | 4 | |
| 15 Sept. | Light rain shower | 29° /24° | 14.4 mm | 4 | |
| 16 Sept. | Light rain shower | 29° /24° | 17.3 mm | 4 | |
| 17 Sept. | Light rain shower | 30° /24° | 16.8 mm | 6 | |
| 18 Sept. | Light rain shower | 29° /24° | 14.3 mm | 5 | |
| 19 Sept. | Light rain shower | 29° /24° | 17.6 mm | 5 | |
| 20 Sept. | Light rain shower | 29° /24° | 29.3 mm | 4 | |
| 21 Sept. | Patchy light drizzle | 29° /24° | 12 mm | 5 | |
| 22 Sept. | Light rain shower | 29° /24° | 11.2 mm | 5 | |
| 23 Sept. | Light rain shower | 29° /24° | 14 mm | 4 | |
| 24 Sept. | Light rain shower | 28° /24° | 24.4 mm | 5 | |
| 25 Sept. | Light rain shower | 28° /24° | 14.8 mm | 4 | |
| 26 Sept. | Light rain shower | 26° /25° | 22.8 mm | 6 | |
| 27 Sept. | Patchy rain possible | 28° /28° | 0.8 mm | 12.7 | |
| 28 Sept. | Patchy rain possible | 28° /27° | 3.7 mm | 11.6 | |
| 29 Sept. | Patchy rain possible | 28° /27° | 9.2 mm | 12.1 | |
| 30 Sept. | Patchy rain possible | 28° /27° | 6.7 mm | 12.2 | |
| Next | |||||
Important Notice
Our weather forecast for Negombo in September is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Negombo forecast closer to your planned date for the most up-to-date weather information.
Change Month
Negombo in September - FAQ
What are the expected maximum and minimum temperatures in Negombo during September?
During September, expect a variety of temperatures with highs around 28° and lows near 25°, suitable for diverse activities and preferences.
How much rainfall should be expected in Negombo during September?
Significant rainfall exceeding 292.8 mm is expected in Negombo during September, occurring over more than 30 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Negombo during September?
The average wind speed in Negombo during September is 21 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Negombo
Explore the daily rainfall trends and prepare for Negombos September weather 💧
Typically, Negombo has 30 rainy days in September with a total of 292.8 mm of rainfall.
UV exposure in Negombo during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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