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Climate · Colombo

Colombo in September

Hot and wet, as the days hold steady.

Typical weather, averaged over 30 years

September in Colombo is hot: highs near 86°F, lows near 76°F. Rain falls on almost every day, and daylight holds at about 12 hours 9 minutes.September in Colombo is hot: highs near 30°C, lows near 24°C. Rain falls on almost every day, and daylight holds at about 12 hours 9 minutes.

High
86°F30°Caverage
Low
76°F24°Caverage
Wet days
7a week · 97% of days
Daylight
12h 09mon average

Is September a good time to visit Colombo?

Yes. September is one of Colombo's most comfortable months (August to September, or December to February).

How we judge it: every month is scored on how close its typical high comes to the range from 70°F to 80°F, how mild its nights are, and how rarely it rains. The best months are the run of months that scores best.How we judge it: every month is scored on how close its typical high comes to the range from 21°C to 27°C, how mild its nights are, and how rarely it rains. The best months are the run of months that scores best.

How September sits in the year

week by week

Temperature

Highs near 86°F in September, against 86°F to 92°F through the year.Highs near 30°C in September, against 30°C to 33°C through the year.

Chance of a wet day

97% of days in September, against 35% to 98% through the year.

Cloud cover

75% cover in September, against 62% to 77% through the year.

Daylight

12h 09m in September, against 11h 44m to 12h 31m through the year.

Week by week, lightly smoothed, with September shaded. The olive line marks the most comfortable months. Hover or tap a week for its figures.

Either side

  1. August86°30°low 76°low 24°7 wet days a weekRain on almost every day.
  2. September86°30°low 76°low 24°7 wet days a weekRain on almost every day.
  3. October87°31°low 76°low 24°7 wet days a weekRain on almost every day.

Where Colombo sits, in September

Asia/Colombo
this place
typical high in September 40°F4°C95°F35°C
Sunrise, mid-September
6:01 AMsets 6:11 PM
Above the sea
10 mlow-lying
Latitude
6.9°Nnorthern hemisphere
Nearest of ours
Galle108 km south

The land around Colombo, shaded by its typical high in September, the planning map's own layer. Hover the map for the figure at that spot; tap it on a phone. Clock times are local, for the 15th.

Elsewhere in Sri Lanka in September

high · low · wet days
See September on the planning mapThe whole year in Colombo

Typical weather, averaged over 30 years (1995–2024), from the 11 km grid square nearest Colombo. Temperatures are adjusted against 66 weather stations: daytime highs read about 3.1°F cold in the source data and are raised to match.Temperatures are adjusted against 66 weather stations: daytime highs read about 1.7°C cold in the source data and are raised to match. Daylight is calculated from latitude. Charts are lightly smoothed week to week; the figures in the table are not. Source: Copernicus ERA5-Land reanalysis; cloud cover from NASA's MERRA-2 reanalysis, on a coarser grid of about 50 km. Contains modified Copernicus Climate Change Service information 2026; neither the European Commission nor ECMWF is responsible for any use of it. These are averages, not a forecast.

Daylight is calculated from latitude. Charts are lightly smoothed week to week; the figures in the table are not.

Source: Copernicus ERA5-Land reanalysis; cloud cover from NASA's MERRA-2 reanalysis, on a coarser grid of about 50 km. Contains modified Copernicus Climate Change Service information 2026; neither the European Commission nor ECMWF is responsible for any use of it. These are averages, not a forecast.