Climate averages 1991–2020
Ambalantota weather
in December.
A hot, wet month: the coolest and the 11th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
December is a hot month in Ambalantota: daytime highs average 28.9°C and nights cool to about 23.6°C. By daytime temperature it is the coolest month of the year.
Expect about 153 mm of rain on roughly 17 days, which makes December a wet month (the 11th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 11 h 46 min on an average December day.
The nearest other city in this atlas is Matara (57 km away). In December its highs average 28.6°C, about as warm as Ambalantota, with 199 mm of rain.
Among the 12 cities listed in Sri Lanka, Ambalantota ranks 4th of 12 for the warmest December highs and 3rd of 12 for the driest December (rainfall, lowest first). The mean December high of those 12 cities is 27.8°C; Ambalantota is 1.1°C warmer than that mean.
From December to January, average highs rise by 0.7°C to 29.6°C, and monthly rainfall falls from 153 mm to 56 mm.
The annual picture
December 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
Ambalantota climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 29.6°C23.2°C | 23.2°C | 56 | 8.6 | 11.812 h |
| February | 30.7°C23.6°C | 23.6°C | 42 | 7.9 | 11.912 h |
| March | 31.7°C24.4°C | 24.4°C | 58 | 11.2 | 12.112 h |
| April | 31.3°C25.2°C | 25.2°C | 110 | 18.7 | 12.312 h |
| May | 31.0°C25.9°C | 25.9°C | 101 | 18.7 | 12.412 h |
| June | 31.0°C25.8°C | 25.8°C | 60 | 14.9 | 12.512 h |
| July | 31.2°C25.6°C | 25.6°C | 45 | 13.2 | 12.412 h |
| August | 31.2°C25.3°C | 25.3°C | 52 | 13.0 | 12.312 h |
| September | 30.9°C25.1°C | 25.1°C | 87 | 16.6 | 12.212 h |
| October | 30.3°C24.7°C | 24.7°C | 141 | 20.3 | 12.012 h |
| November | 29.2°C24.1°C | 24.1°C | 231 | 23.0 | 11.812 h |
| December, selected | 28.9°C23.6°C | 23.6°C | 153 | 16.9 | 11.812 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
December in nearby cities
- Matara in DecemberSri Lanka · 57 kmHigh 28.6°C · Low 23.7°C · 199 mm rain
- Galle in DecemberSri Lanka · 90 kmHigh 28.0°C · Low 23.9°C · 148 mm rain
- Kandy in DecemberSri Lanka · 137 kmHigh 25.5°C · Low 19.8°C · 214 mm rain
- Dehiwala-Mount Lavinia in DecemberSri Lanka · 150 kmHigh 29.0°C · Low 23.3°C · 174 mm rain
- Colombo in DecemberSri Lanka · 158 kmHigh 29.2°C · Low 23.2°C · 164 mm rain
- Kalmunai in DecemberSri Lanka · 169 kmHigh 27.2°C · Low 24.2°C · 310 mm rain
- Negombo in DecemberSri Lanka · 178 kmHigh 29.1°C · Low 23.5°C · 137 mm rain
- Batticaloa in DecemberSri Lanka · 192 kmHigh 27.3°C · Low 23.5°C · 302 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 Ambalantota) is explained once on the Ambalantota year overview and on the Sources, method and limits page.