The month in detail
What to expect in September
September falls in the wet season in Colombo. Showers are often brief but intense. With 51% of rainy days, always have indoor alternatives planned.
September ranks 7 out of 12 months in Colombo. Compared to August: +2°F daytime, 18 pts more rainy days.
This month's conditions
What it's like in September
UV index
9 · very high
protection essential
Feels like
very humid
24°
Sea
29°C
warm, ideal
Daylight
12.0h of daylight
Air quality
good
AQI 31
Compare
Is September the right month?
The best month in Colombo is January (5.9/10), 0.8 pt higher than September.
Book
Plan your trip
Hotels at their lowest outside peak season, highest on comfortable months. Shoulder seasons offer a good price/climate compromise.
Stay
Hotels & rentals · Colombo
Expedia →
Activities
Tours, tickets, experiences
See ↓
Flights
Multi-airline comparator
Kiwi →
🎟️ Activities & tours · Colombo
GetYourGuide selection · free cancellation
Practical info
What you need to know before you go
Three angles: the country (language, currency, safety, budget), the year-round climate, and the specifics of a tropical stay.
Country · Sri Lanka
🗣️LanguageCingalais
💶CurrencyRoupie sri-lankaise (Rs)
🚗DrivingLeft-hand
🛡️Safety ⓘVery safe · 1/5
💰Cost of living ⓘCheap · 2/5
🌡️ Climate
🌍Climate typeEquatorial tropical
📈Climate trend ⓘStable
🔥Hottest monthFebruary · 88°F
❄️Coolest monthAugust · 82°F
🌧️Rainiest month ⓘOctober · 60%
🏝️ Tropical stay
🌞Dry season ⓘMay → Sep
🌧️Wet season ⓘDec → Mar
🌀Cyclones ⓘNone (equator)
Explore
Other destinations in September
If September doesn't convince you for this destination, compare with others.
Location
Where is Colombo ?
Global position + regional geographic context.
🌍 World
🔍 Geographic context
Sri LankaEquatorial tropical climate with a 5.9 → 4.8 gap between best and worst month. 10 years of ERA5 data to choose by project.
6.93°N · 79.84°E
Questions
Frequently asked questions
What is the best time to visit Colombo?
January is the best month with 86°F highs, 73°F lows, 8.0h of sunshine and 16.0% rainy days.
How many hours of sunshine does Colombo get in January?
Colombo averages 8.0 sunshine hours per day in January. It is the sunniest month with a climate score of 5.8/10.
What is the rainiest month in Colombo?
May is the most unfavourable month with May has the lowest climate score of the year and the lowest climate score of the year.
What are the temperatures at night in Colombo in January?
In January, overnight lows reach 73°F, while afternoon highs average 86°F.
Is Colombo good in winter?
In winter (December-February), Colombo scores 5.6/10 on average — Acceptable conditions for cultural visits.. The best month overall remains January with a score of 5.8/10.
When should you avoid Colombo?
May is the most difficult month to visit Colombo, with May has the lowest climate score of the year. Climate conditions are at their lowest of the year during this period.
Can you swim in Colombo in September?
In September, the sea averages 85°F in Colombo: warm, ideal. Ideal conditions for swimming and snorkeling.
Do you need sun protection in Colombo in September?
The average UV index reaches 9 in September in Colombo (very high), with about 12.0h of daylight. Protection essential.