Colombo Weather in December

NASA POWER reanalysis for the half-degree grid cell around Colombo, 1991-2020; a grid cell is an area average and can differ from a thermometer in town by several degrees

Average highs run from 26°C on December 1 to 27°C on December 31, and lows from 18°C to 20°C. Normal precipitation for the month is 205 mm over about 22 wet days.

December day by day

The normal high and low for each date, in °C.

Normal low
Normal high
Reanalysis extreme high
Reanalysis extreme low

December at a glance

Average high: 27°C
Average low: 19°C
Precipitation: 205 mm
Reanalysis high: 37°CDec 11, 2012
Reanalysis low: 12°CDec 15, 1995
Daylight: 13 h 36 min to 13 h 42 min
Cloud cover: 79%
Humidity: 86%
Dew point: 20°C
Wind: 4.3 km/h

Every day of the month

A wet day has at least 1 mm of precipitation in the reanalysis.

Date	Normal high	Normal low	Reanalysis high	Reanalysis low	Chance wet
Dec 1	26°C	18°C	32°C 2014	13°C 1994	71%
Dec 2	26°C	18°C	33°C 2014	15°C 1998	70%
Dec 3	26°C	18°C	35°C 2014	14°C 2005	69%
Dec 4	26°C	18°C	32°C 2012	13°C 2005	69%
Dec 5	26°C	18°C	33°C 2012	14°C 2016	68%
Dec 6	27°C	18°C	35°C 2012	15°C 2008	69%
Dec 7	27°C	18°C	37°C 2012	15°C 2008	70%
Dec 8	27°C	18°C	32°C 2014	14°C 2018	71%
Dec 9	27°C	18°C	31°C 2000	14°C 2018	71%
Dec 10	27°C	18°C	34°C 2012	15°C 2018	72%
Dec 11	27°C	18°C	37°C 2012	15°C 2005	72%
Dec 12	27°C	18°C	33°C 2018	14°C 2005	71%
Dec 13	27°C	18°C	32°C 1994	15°C 2010	71%
Dec 14	27°C	19°C	33°C 1994	13°C 2010	72%
Dec 15	27°C	19°C	33°C 2018	12°C 1995	72%
Dec 16	27°C	19°C	32°C 2004	15°C 1995	74%
Dec 17	27°C	19°C	33°C 2017	15°C 2000	75%
Dec 18	27°C	19°C	32°C 2006	15°C 2000	76%
Dec 19	27°C	19°C	31°C 2018	14°C 2000	76%
Dec 20	27°C	19°C	33°C 2002	16°C 2000	77%
Dec 21	27°C	19°C	33°C 2012	16°C 1993	76%
Dec 22	27°C	19°C	32°C 2011	16°C 2004	75%
Dec 23	28°C	19°C	33°C 1997	16°C 1993	75%
Dec 24	28°C	19°C	31°C 2015	16°C 2003	76%
Dec 25	28°C	20°C	35°C 2012	16°C 2003	77%
Dec 26	28°C	20°C	37°C 2012	15°C 2001	78%
Dec 27	28°C	20°C	36°C 2016	15°C 1992	79%
Dec 28	27°C	20°C	32°C 2007	15°C 1992	79%
Dec 29	27°C	20°C	32°C 2007	15°C 1991	80%
Dec 30	27°C	20°C	33°C 2013	15°C 1993	80%
Dec 31	27°C	20°C	37°C 2013	15°C 1993	79%

Chance of rain

Chance of a wet day

Sunrise and sunset

Times for 2026, local time (GMT-3).

December 1: sunrise 5:18 AM, sunset 6:54 PM
December 31: sunrise 5:29 AM, sunset 7:11 PM

Every day of December: sun and moon

Other months

Sources

Cloud, humidity, wind and sunshine, and temperature and precipitation: NASA POWER (MERRA-2, CERES and GEWEX SRB), 1991-2020. The data was obtained from the National Aeronautics and Space Administration (NASA) Langley Research Center's Prediction Of Worldwide Energy Resources (POWER) project funded through the NASA Earth Science Division: POWER Daily API v2, accessed 2026-09-24. Sun and moon: computed with the NOAA solar equations and Meeus.