Colombo weather in August
Temperature, sea and sunshine in August: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in August
Fair
Best time to visit: January – February
What is the weather like in Colombo in August?
In August, Colombo is hot: daytime highs average 29 °C, and even at night it stays warm at around 25 °C. The sea averages 27.6 °C – lovely and warm for swimming. Expect around 6 hours of sunshine a day. It is the rainy season: rain falls on about 29 days, totalling 219 mm. The air is often humid and muggy. All in all, August is a so-so month for a holiday in Colombo.
August compared
How the weather changes from July to September. Tap a month to open it.
| JulyJul | AugustAug | SeptemberSep | |
|---|---|---|---|
| Score | 50 | 51 | 49 |
| Day | 29° | 29° | 29° |
| Night | 25° | 25° | 25° |
| Sea | 28° | 28° | 28° |
| Sun | 6 h | 6 h | 6 h |
| Rain days | 29 | 29 | 28 |
More details for August
- Daylight
- 12 h 21 min06:05 – 18:26
- UV index
- 13 · extremeclear sky, noon (estimate)
- Muggy days
- 31 daysdew point 18 °C or more
- Wind
- 17 km/haverage daily peak
- Cloud cover
- 86 %on average
- Hot days
- 0 days30 °C or more
- Time zone
- UTC+5:30Asia/Colombo
How the score comes together
- Temperatureweight 50 %81 %
- Sunshineweight 20 %52 %
- Few rainy daysweight 30 %0 %
Each factor is rated from 0 to 100 % and weighted for the travel style “City break”.
What to pack in August
- Swimwear
- Sunscreen
- Sunglasses & sun hat
- Light, breathable clothes
- Insect repellent
- Rain jacket or umbrella
Colombo in August: quick answers
Is Colombo hot in August?
Yes. In August, Colombo is hot: daytime highs average 29 °C and nights stay around 25 °C.
Can you swim in Colombo in August?
Yes. In August the sea averages 27.6 °C – lovely and warm for swimming.
Does it rain much in Colombo in August?
It rains often – on about 29 days, adding up to 219 mm.
Colombo month by month
The whole year in ColomboAll destinations: Sri Lanka
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, GeoNames (CC BY 4.0)