Colombo weather in September
Colombo in September averages 28°C (82°F), 270 mm of rain and 6.3 hours of sun a day. It is one of the wetter months of the year here.
Of the twelve months in Colombo, September is the sixth coldest and the fourth wettest.
- Average temp
- 28°C (82°F)
25–30°C · 78–87°F
- Rainfall
- 270 mm
A wet month
- Sunshine
- 6.3 h
hours per day
What is Colombo like in September?
Daytime
Days are warm, typically in the mid-20s°C or above.
Rain
Expect frequent rain — this is a wet month.
Evening
Evenings stay warm.
What should I pack for Colombo in September?
High-factor sun cream
With daytime highs around 30°C, burn time is short even in shade.
Sunglasses and a brimmed hat
Midday glare is the part people underpack for, not the heat itself.
Loose cotton or linen
Synthetics stop working once you are sweating through them all day.
A refillable water bottle
Daily highs this warm need roughly double the water a temperate day does.
A proper waterproof, not a folding umbrella
270 mm in the month usually arrives as heavy bursts that an umbrella will not cover.
A dry bag for phone and documents
Worth it for one downpour caught between the taxi and the door.
September compared with August and October
September in Colombo is about the same temperature as August and 149 mm wetter than it, which averages 28°C (82°F).
September in Colombo is about the same temperature as October and 79 mm drier than it, which averages 28°C (82°F).
Daylight in Colombo in September
On 15 September the sun is up for 12 hours 9 minutes in Colombo, rising about 06:00 and setting about 18:10 local time.
September ends 11 minutes shorter than it begins, so the last week of the month is a different length of day from the first.
Where to stay in Colombo
Dates are a starting point for September.
Travel guides for Colombo
What to read before you book.
Colombo weather by month
TemperatureRainfall
How September compares with the rest of the year
September is highlighted. Every other month links to its own page.
| Month | Average | Rainfall |
|---|---|---|
| January | 27°C / 81°F | 83 mm |
| February | 28°C / 82°F | 76 mm |
| March | 28°C / 83°F | 103 mm |
| April | 29°C / 83°F | 251 mm |
| May | 29°C / 84°F | 314 mm |
| June | 28°C / 83°F | 202 mm |
| July | 28°C / 82°F | 128 mm |
| August | 28°C / 82°F | 122 mm |
| September | 28°C / 82°F | 270 mm |
| October | 28°C / 82°F | 349 mm |
| November | 27°C / 81°F | 343 mm |
| December | 27°C / 81°F | 176 mm |
Check another month
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FAQs about Colombo in September
September climate averages for Colombo, 1991–2020.
Colombo averages 28°C (82°F) in September, ranging from about 25°C (78°F) at night to 30°C (87°F) in the afternoon. That is a 1991–2020 average, so an individual week can run either side of it.
Yes, a lot. September brings about 270 mm, which makes it one of the wetter months here — expect heavy bursts rather than all-day drizzle.
They are about the same. September averages 28°C (82°F) and October 28°C (82°F), so temperature alone will not decide between them.
September is about as warm as August, and 149 mm wetter.
It is outside the easiest window. The most comfortable stretch here is December to March; September sits outside it, which usually means more heat, more rain, or both — worth it if you would rather have the place to yourself.
About 6.3 hours of sun a day on the 1991–2020 average.
This page does not show today's weather. It is a 1991–2020 climate normal from Meteostat — a long-run average of what September is usually like, which is what you want when booking months ahead. For today or the coming week, check a live forecast.
About 12 hours 9 minutes of daylight in mid-September, against 12 hours 31 minutes in June and 11 hours 44 minutes in December.
On 15 September, sunrise is about 06:00 and sunset about 18:10 local time. Both shift across the month — the month ends 11 minutes shorter than it starts.
