December
Best time
30°C / 23°C
12 rain days
hot, rainy
- outside peak hazard season
Best time to visit Colombo
Colombo, Sri Lanka — ranked month by month from data: temperature, rainfall, snow, and peak hazard seasons. The standouts: December.
About Colombo
Colombo is the largest city of Sri Lanka by population, serving as the country's executive and judicial capital. It is also the de facto commercial capital of Sri Lanka. The Colombo metropolitan area is estimated to have a population of 5.6 million, and 752,993 within the municipal limits.
— condensed from Wikipedia
Best months to visit
OK — shoulder months
February
OK
31°C / 22°C
6 rain days
hot
- very low rainfall (only 6 rain days)
- outside peak hazard season
- warm evenings without humidity overload
January
OK
31°C / 22°C
8 rain days
hot
- manageable rain (8 days)
- outside peak hazard season
- warm evenings without humidity overload
July
OK
29°C / 25°C
15 rain days
hot, rainy
- outside peak hazard season
August
OK
29°C / 25°C
15 rain days
hot, rainy
- outside peak hazard season
March
OK
32°C / 23°C
10 rain days
hot, rainy
- manageable rain (10 days)
- outside peak hazard season
September
OK
30°C / 25°C
16 rain days
hot, very wet
- outside peak hazard season
November
OK
30°C / 23°C
18 rain days
hot, very wet
- outside peak hazard season
April
OK
32°C / 24°C
15 rain days
hot, rainy
- outside peak hazard season
Months to skip
June
Skip
30°C / 25°C
19 rain days
hot, very wet
- extremely wet (19 rain days)
October
Skip
30°C / 24°C
21 rain days
hot, very wet
- extremely wet (21 rain days)
May
Skip
31°C / 25°C
21 rain days
hot, very wet
- very hot (31°C)
- extremely wet (21 rain days)
How we ranked these
Each month is scored on temperature comfort (18–27°C avg high is the sweet spot), rainfall (more rain days = lower score), snow days, and peak hazard seasons (hurricanes, monsoons, etc.). Green-tier months are within ideal range with no major issues. Yellow are workable but with trade-offs. Red has at least one significant problem — extreme heat or cold, heavy rain, or peak storm season.