Hot in Dec
31°C average high
avg high · 22° at night
25°C+ on almost every day
Sri Lanka
Sri Lanka (Colombo) weather in December
Is it warm? Yes. December in Sri Lanka (Colombo) is hot: afternoons average 29°C and nights 23°C. Most days (80%) peak between 28°C and 31°C.
Hot · average high
29°C
25°C or more on almost every day.
- Average low23°overnight
- Sea29°average, 2023–2025
- Rainy days16180 mm in the month
- SkyMostly cloudy72% cloud · 8% clear days
How warm it really gets
Every December afternoon from 2011–2025: 465 days. Most (80%) peaked between 28° and 31°.
December, year by year
The average December high in each year. The warmest, 2025, averaged 30°C; the coolest, 2014, 28°C.
Compared with home
Average December highs. Expect rain on about 16 days (180 mm in a typical month).
- Sri Lanka (Colombo)29°
- Cork10°
- Dublin9°
- London9°
- Belfast8°
- Manchester8°
- Glasgow7°
Warmer in December, not much further
Flying times are estimates from Dublin; Sri Lanka (Colombo) is about 11h 45m.
Hot in Dec
30°C average high
avg high · 25° at night
25°C+ on almost every day
Hot in Dec
30°C average high
avg high · 26° at night
25°C+ on almost every day
Air: ERA5 reanalysis via Open-Meteo, 2011–2025. Sea: Copernicus Marine analysis via Open-Meteo, 2023–2025. Rainy day = 2 mm or more. Clear day = average cloud cover of 30% or less. These are averages of past weather, not a forecast. Methodology