Colombo weather in September
September is a fair month to visit Colombo: highs of 28°C (82°F) and about 162 mm (6.4 in) of rain on average. Nights average 25°C (76°F) and cloud cover 73% (NASA POWER, 2001–2025 averages). The sea averages 29°C (84°F). It is the 6th wettest month of the year and the 3rd coolest. Compared with August, it is about as warm and wetter; October brings highs of 28°C (82°F) and 292 mm (11.5 in) of rain.
Is September a good time to visit Colombo?
fair month Weather score 58/100.
September is a fair month in Colombo. The weather is usually best in Jul–Aug, Jan–Mar.
Does it rain a lot in Colombo in September?
Yes, it is one of the rainy months: about 162 mm (6.4 in) falls in an average September. It is the 6th wettest month of the year.
How warm is Colombo in September?
Days average 28°C (82°F) and nights 25°C (76°F).
Colombo weather by month
| Month | High | Low | Rain | Cloud | Sea | Weather |
|---|---|---|---|---|---|---|
| January | 29°C (84°F) | 22°C (72°F) | 76 mm | 55% | 29°C (84°F) | best |
| February | 30°C (86°F) | 23°C (73°F) | 71 mm | 51% | 29°C (85°F) | best |
| March | 31°C (87°F) | 24°C (76°F) | 115 mm | 54% | 30°C (86°F) | best |
| April | 30°C (86°F) | 25°C (78°F) | 226 mm | 64% | 31°C (88°F) | fair |
| May | 29°C (84°F) | 26°C (78°F) | 224 mm | 73% | 31°C (87°F) | fair |
| June | 28°C (83°F) | 25°C (77°F) | 143 mm | 75% | 29°C (84°F) | fair |
| July | 28°C (82°F) | 25°C (76°F) | 99 mm | 75% | 29°C (84°F) | best |
| August | 28°C (82°F) | 25°C (76°F) | 113 mm | 73% | 29°C (84°F) | best |
| September | 28°C (82°F) | 25°C (76°F) | 162 mm | 73% | 29°C (84°F) | fair |
| October | 28°C (82°F) | 24°C (76°F) | 292 mm | 74% | 29°C (84°F) | least pleasant |
| November | 28°C (83°F) | 24°C (75°F) | 305 mm | 77% | 29°C (85°F) | least pleasant |
| December | 28°C (83°F) | 23°C (73°F) | 175 mm | 69% | 29°C (84°F) | fair |
Sources: 2001–2025 monthly averages from NASA POWER (MERRA-2 reanalysis), sea temperature from Open-Meteo Marine. Page updated . How we rate months