Colombo Weather in September
In September, Colombo averages a high of 30°C (87°F) and a low of 26°C (78°F), from 16 years of daily records (2009–2026).
30°C
Average high
87°F
26°C
Average low
78°F
32°C
Record high
90°F · September 16, 1980
22°C
Record low
72°F · September 15, 1979
What September Is Like in Colombo
- September 2025 was the warmest September in 16 years of records, 0.7°C (1.2°F) above the long-run average.
- 9 of the 10 warmest Septembers on record in Colombo have come since 2011.
- The September heat record, 32°C (90°F) on September 16, 1980, has stood for 46 years.
- The coldest September reading, 22°C (72°F) on September 15, 1979, has not been matched in 47 years.
At least 1 mm of rain falls on 53% of September days, and the month averages 310 mm in total.
Warmest: 2018 (30.9°C)Latest: 2025 (30.4°C)10-year averageLong-run average (30.3°C)
Look Up a Day in September
See the weather in Colombo on any September date, year by year.
Source: NOAA GHCN-Daily, Colombo (1978–2026). Averages cover 2009–2026. How we compute this