Colombo weather in September
September in Colombo: sweltering, soaked, with clean air — a fair time to visit.
#8 of 12 months in Colombo · #532 of 604 destinations to visit in September · comfort 57/100 (tier D)
Updated June 2026 · climate normals from ERA5 reanalysis
Colombo climate normals — September
| Daytime high | 29°C / 83°F | 🔥 sweltering |
|---|---|---|
| Nighttime low | 25°C / 76°F | |
| Feels like (high) | 34°C / 93°F | |
| Rainfall | 278 mm / 10.9 in | ⛈ soaked |
| Rainy days | 29 days | |
| Humidity | 87% | 💦 very humid |
| Dew point | 24°C / 75°F | |
| Sunshine | 8.5 h/day | |
| Daylight | 12.2 h | |
| Wind | 16 km/h / 10 mph | |
| Air quality (US AQI) | 50 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Colombo in September — FAQ
- Is September a good time to visit Colombo?
- September in Colombo: sweltering, soaked, with clean air — a fair time to visit. It ranks #8 of 12 months for Colombo on SeasonMap's comfort score (57/100).
- What is the weather like in Colombo in September?
- In September, Colombo averages a daily high of 28.6°C and a low of 24.5°C, with about 277.6 mm of rain over roughly 28.8 rainy days.
- What is the air quality in Colombo in September?
- Colombo has a mean US Air Quality Index of about 50 in September.