What to pack for Colombo in September
- light, breathable clothing
- sun protection (hat, SPF 50)
- a compact umbrella or rain shell — rain is frequent
- expect humid, sticky conditions
Humidity averages 87%; max daily wind around 19 km/h.
How September compares
Best months in Colombo: January–February & June–October. See the full best time to visit Colombo guide.
Colombo in September: the details
In September, Colombo sees average daytime highs of 28°C (83°F) and overnight lows of 25°C (76°F). Rainfall totals roughly 345 mm across 29.2 rainy days, and the sun shines about 8.5 hours per day with 12 hours of daylight mid-month. Relative humidity averages 87%.
In context: September is the 11th-warmest month and the 4th-wettest in Colombo. The sunniest month is February (11.1 h/day).
| Metric | September average |
|---|---|
| Daytime high | 28°C / 83°F |
| Overnight low | 25°C / 76°F |
| Rainfall | 345 mm over 29.2 rainy days |
| Sunshine | 8.5 h/day (12 h daylight) |
| Humidity | 87% |
| Travel score | 5.3 / 10 |
These figures are climate normals computed from the ERA5 weather reanalysis (2019–2024) for Colombo, Sri Lanka (6.94, 79.85) — see our methodology. Actual conditions vary year to year.
Not set on Colombo? Browse the best places to visit in September ranked by travel score.
Frequently asked questions
How hot is Colombo in September?
Daytime highs in Colombo in September average 28°C (83°F); nights drop to about 25°C.
Does it rain in Colombo in September?
Expect around 29.2 rainy days and 345 mm of rainfall in September.
Is September a good time to visit Colombo?
September is a fair shoulder-season month in Colombo — decent conditions with some trade-offs. Overall travel score: 5.3/10. The best months are January–February & June–October.
Where should you go next month?
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