Tonga Weather in December

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

Average highs run from 27°C on December 1 to 28°C on December 31, and lows from 18°C to 17°C. Normal precipitation for the month is 22 mm over about 3 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: 17°C
Precipitation: 22 mm
Reanalysis high: 29°CDec 31, 2020
Reanalysis low: 13°CDec 21, 2007
Daylight: 11 h 52 min to 11 h 50 min
Cloud cover: 36%
Humidity: 76%
Dew point: 17°C
Wind: 5.4 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	27°C	18°C	29°C 2020	13°C 2011	32%
Dec 2	27°C	18°C	29°C 2020	14°C 2011	31%
Dec 3	27°C	18°C	28°C 2020	15°C 2011	29%
Dec 4	27°C	18°C	29°C 2005	14°C 2006	28%
Dec 5	27°C	18°C	29°C 1991	14°C 2011	26%
Dec 6	27°C	18°C	29°C 1991	15°C 2000	24%
Dec 7	27°C	18°C	28°C 1997	14°C 2003	22%
Dec 8	27°C	18°C	28°C 2014	15°C 2003	21%
Dec 9	27°C	18°C	29°C 2019	15°C 2011	20%
Dec 10	27°C	18°C	29°C 2002	14°C 2011	18%
Dec 11	27°C	17°C	28°C 2001	15°C 2015	16%
Dec 12	27°C	17°C	29°C 2017	15°C 2011	14%
Dec 13	27°C	17°C	29°C 2005	15°C 2011	12%
Dec 14	27°C	17°C	29°C 2003	14°C 2013	11%
Dec 15	27°C	17°C	29°C 2018	14°C 2000	11%
Dec 16	27°C	17°C	29°C 2005	14°C 2015	10%
Dec 17	27°C	17°C	29°C 2009	13°C 2013	10%
Dec 18	27°C	17°C	29°C 2019	14°C 2013	9%
Dec 19	27°C	17°C	29°C 2019	14°C 2013	8%
Dec 20	27°C	17°C	29°C 2005	14°C 2013	7%
Dec 21	28°C	17°C	29°C 2005	13°C 2007	6%
Dec 22	28°C	17°C	29°C 2019	14°C 2007	6%
Dec 23	28°C	17°C	29°C 2016	13°C 2007	6%
Dec 24	28°C	17°C	29°C 2019	14°C 2007	5%
Dec 25	28°C	17°C	29°C 2019	13°C 2007	5%
Dec 26	28°C	17°C	29°C 2019	14°C 2006	6%
Dec 27	28°C	17°C	29°C 2019	14°C 2006	6%
Dec 28	28°C	17°C	29°C 2020	14°C 2006	6%
Dec 29	28°C	17°C	29°C 2020	14°C 2006	6%
Dec 30	28°C	17°C	29°C 2014	14°C 2002	6%
Dec 31	28°C	17°C	29°C 2020	13°C 2006	7%

Chance of rain

Chance of a wet day

Sunrise and sunset

Times for 2026, local time (GMT+1).

December 1: sunrise 6:10 AM, sunset 6:02 PM
December 31: sunrise 6:25 AM, sunset 6:15 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.