Gampaha District (Negombo)
September
Weather in Gampaha District for September 2026
Your guide to Gampaha District weather in September - trends and predictions
So far, September 2026 in Gampaha District is slightly warmer than the historical average by 1.3 °C.
Expect cooler weather in the next days in Gampaha District with the forecast suggesting a temperature of 27.9 °C, lower than the historical average.
In general, the average temperature in Gampaha District at the beginning of September is 29.9 °C. As the month progressed, temperatures tended to moderately fall, reaching an average of 28 °C by the end of September.
Gampaha District 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
Gampaha District Weather September
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Temperatures trend during September in Gampaha District
See the weather trend as well as the moving average line
September weather in Gampaha District 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 | 28° /27° | 8.8 mm | 9.8 | |
| 15 Sept. | Light rain shower | 28° /27° | 11.4 mm | 11 | |
| 16 Sept. | Light rain shower | 28° /26° | 13.3 mm | 1.9 | |
| 17 Sept. | Light rain shower | 27° /25° | 18 mm | 6.5 | |
| 18 Sept. | Patchy rain possible | 28° /27° | 8.8 mm | 7 | |
| 19 Sept. | Light rain shower | 28° /27° | 15.8 mm | 6 | |
| 20 Sept. | Light rain shower | 28° /27° | 22.1 mm | 6 | |
| 21 Sept. | Light rain shower | 28° /27° | 17.6 mm | 6 | |
| 22 Sept. | Light rain shower | 28° /27° | 15.5 mm | 6 | |
| 23 Sept. | Light rain shower | 28° /27° | 11.8 mm | 6 | |
| 24 Sept. | Light rain shower | 28° /28° | 5.9 mm | 6 | |
| 25 Sept. | Patchy rain possible | 28° /28° | 3.4 mm | 6 | |
| 26 Sept. |  Thundery outbreaks possible | 28° /28° | 5.1 mm | 6 | |
| 27 Sept. | Light rain shower | 28° /28° | 8.9 mm | 6 | |
| 28 Sept. | Thundery outbreaks possible | 28° /25° | 8.3 mm | 6 | |
| 29 Sept. | Light rain shower | 28° /25° | 3.4 mm | 6 | |
| 30 Sept. | Light rain shower | 28° /25° | 5.8 mm | 6 | |
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Important Notice
Our weather forecast for Gampaha District 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 Gampaha District forecast closer to your planned date for the most up-to-date weather information.
Change Month
Gampaha District in September - FAQ
What are the expected maximum and minimum temperatures in Gampaha District 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 Gampaha District during September?
Significant rainfall exceeding 292.8 mm is expected in Gampaha District during September, occurring over more than 30 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Gampaha District during September?
The average wind speed in Gampaha District during September is 21 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Gampaha District
Explore the daily rainfall trends and prepare for Gampaha Districts September weather 💧
Typically, Gampaha District has 30 rainy days in September with a total of 292.8 mm of rainfall.
UV exposure in Gampaha District during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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