Climate averages 1991–2020
Dehiwala-Mount Lavinia weather
in October.
A hot, very wet month: the 9th warmest and the 11th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
October is a hot month in Dehiwala-Mount Lavinia: daytime highs average 28.5°C and nights cool to about 24.2°C. By daytime temperature it is the 9th warmest of the 12 months.
Expect about 328 mm of rain on roughly 26 days, which makes October a very wet month (the 11th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 11 h 59 min on an average October day.
The nearest other city in this atlas is Colombo (11 km away). In October its highs average 28.8°C, about as warm as Dehiwala-Mount Lavinia, with 327 mm of rain.
Among the 12 cities listed in Sri Lanka, Dehiwala-Mount Lavinia ranks 9th of 12 for the warmest October highs and 12th of 12 for the driest October (rainfall, lowest first). The mean October high of those 12 cities is 29.1°C; Dehiwala-Mount Lavinia is 0.7°C cooler than that mean.
From October to November, average highs rise by 0.2°C to 28.7°C, and monthly rainfall rises from 328 mm to 330 mm.
The annual picture
October 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
Dehiwala-Mount Lavinia climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 29.9°C23.1°C | 23.1°C | 60 | 8.7 | 11.812 h |
| February | 30.8°C23.7°C | 23.7°C | 58 | 8.6 | 11.912 h |
| March | 31.0°C24.5°C | 24.5°C | 75 | 14.9 | 12.112 h |
| April | 30.4°C25.0°C | 25.0°C | 174 | 24.1 | 12.312 h |
| May | 29.2°C25.4°C | 25.4°C | 293 | 29.1 | 12.412 h |
| June | 28.6°C25.1°C | 25.1°C | 256 | 26.6 | 12.513 h |
| July | 28.2°C24.8°C | 24.8°C | 205 | 25.4 | 12.512 h |
| August | 28.1°C24.7°C | 24.7°C | 183 | 24.4 | 12.312 h |
| September | 28.2°C24.5°C | 24.5°C | 232 | 24.3 | 12.212 h |
| October, selected | 28.5°C24.2°C | 24.2°C | 328 | 26.1 | 12.012 h |
| November | 28.7°C23.7°C | 23.7°C | 330 | 23.8 | 11.812 h |
| December | 29.0°C23.3°C | 23.3°C | 174 | 16.5 | 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
October in nearby cities
- Colombo in OctoberSri Lanka · 11 kmHigh 28.8°C · Low 24.1°C · 327 mm rain
- Negombo in OctoberSri Lanka · 41 kmHigh 28.8°C · Low 24.5°C · 315 mm rain
- Galle in OctoberSri Lanka · 96 kmHigh 27.8°C · Low 24.5°C · 263 mm rain
- Kandy in OctoberSri Lanka · 98 kmHigh 26.9°C · Low 20.7°C · 257 mm rain
- Matara in OctoberSri Lanka · 123 kmHigh 28.4°C · Low 24.4°C · 250 mm rain
- Ambalantota in OctoberSri Lanka · 150 kmHigh 30.3°C · Low 24.7°C · 141 mm rain
- Batticaloa in OctoberSri Lanka · 223 kmHigh 31.0°C · Low 24.8°C · 152 mm rain
- Kalmunai in OctoberSri Lanka · 226 kmHigh 30.2°C · Low 25.2°C · 164 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 Dehiwala-Mount Lavinia) is explained once on the Dehiwala-Mount Lavinia year overview and on the Sources, method and limits page.