Climate averages 1991–2020
Colombo weather
in April.
A hot, wet month: the 3rd warmest and the 5th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
April is a hot month in Colombo: daytime highs average 30.8°C and nights cool to about 25.0°C. By daytime temperature it is the 3rd warmest of the 12 months.
Expect about 167 mm of rain on roughly 25 days, which makes April a wet month (the 5th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 16 min on an average April day.
The nearest other city in this atlas is Dehiwala-Mount Lavinia (11 km away). In April its highs average 30.4°C, about as warm as Colombo, with 174 mm of rain.
Among the 12 cities listed in Sri Lanka, Colombo ranks joint 6th of 12 for the warmest April highs and 9th of 12 for the driest April (rainfall, lowest first). The mean April high of those 12 cities is 30.7°C; Colombo is 0.1°C warmer than that mean.
From April to May, average highs fall by 1.3°C to 29.5°C, and monthly rainfall rises from 167 mm to 279 mm.
The annual picture
April in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Colombo climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 30.4°C22.9°C | 22.9°C | 53 | 7.8 | 11.812 h |
| February | 31.5°C23.4°C | 23.4°C | 55 | 7.8 | 11.912 h |
| March | 31.6°C24.4°C | 24.4°C | 75 | 14.9 | 12.112 h |
| April, selected | 30.8°C25.0°C | 25.0°C | 167 | 24.8 | 12.312 h |
| May | 29.5°C25.4°C | 25.4°C | 279 | 28.9 | 12.412 h |
| June | 28.8°C25.1°C | 25.1°C | 242 | 26.7 | 12.513 h |
| July | 28.5°C24.8°C | 24.8°C | 183 | 24.4 | 12.512 h |
| August | 28.4°C24.6°C | 24.6°C | 168 | 23.6 | 12.312 h |
| September | 28.5°C24.5°C | 24.5°C | 223 | 24.5 | 12.212 h |
| October | 28.8°C24.1°C | 24.1°C | 327 | 26.0 | 12.012 h |
| November | 29.0°C23.6°C | 23.6°C | 307 | 23.7 | 11.812 h |
| December | 29.2°C23.2°C | 23.2°C | 164 | 15.6 | 11.712 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
April in nearby cities
- Dehiwala-Mount Lavinia in AprilSri Lanka · 11 kmHigh 30.4°C · Low 25.0°C · 174 mm rain
- Negombo in AprilSri Lanka · 30 kmHigh 30.7°C · Low 25.5°C · 163 mm rain
- Kandy in AprilSri Lanka · 95 kmHigh 29.1°C · Low 21.5°C · 171 mm rain
- Galle in AprilSri Lanka · 107 kmHigh 29.2°C · Low 25.4°C · 147 mm rain
- Matara in AprilSri Lanka · 133 kmHigh 29.9°C · Low 25.2°C · 182 mm rain
- Ambalantota in AprilSri Lanka · 158 kmHigh 31.3°C · Low 25.2°C · 110 mm rain
- Batticaloa in AprilSri Lanka · 221 kmHigh 31.8°C · Low 25.3°C · 59 mm rain
- Kalmunai in AprilSri Lanka · 225 kmHigh 30.8°C · Low 25.8°C · 70 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Colombo) is explained once on the Colombo year overview and on the Sources, method and limits page.