Sydney Weather in December

1991-2020 means of the daily record at Sydney Airport Amo (GHCN ASN00066037), 9 km from Sydney

Average highs run from 27°C on December 1 to 28°C on December 31, and lows from 18°C to 20°C. Normal precipitation for the month is 67 mm over about 11 wet days.

December day by day

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

Normal low
Normal high
Record high
Record low

December at a glance

Average high: 26°C
Average low: 18°C
Precipitation: 67 mm
Record high: 44°CDec 9, 2023
Record low: 8°CDec 7, 1943
Daylight: 14 h 14 min to 14 h 22 min
Cloud cover: 61%
Humidity: 73%
Dew point: 16°C
Wind: 14.8 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	Record high	Record low	Chance wet
Dec 1	27°C	18°C	42°C 2004	12°C 1991	40%
Dec 2	26°C	17°C	40°C 1957	11°C 1942	39%
Dec 3	26°C	17°C	38°C 1976	12°C 1955	40%
Dec 4	26°C	18°C	38°C 1939	10°C 1942	40%
Dec 5	25°C	18°C	41°C 1979	10°C 1955	39%
Dec 6	26°C	18°C	39°C 2025	10°C 1939	39%
Dec 7	26°C	18°C	40°C 2005	8°C 1943	39%
Dec 8	26°C	18°C	38°C 1950	11°C 1966	38%
Dec 9	26°C	18°C	44°C 2023	12°C 1943	37%
Dec 10	26°C	18°C	38°C 1977	10°C 1964	36%
Dec 11	26°C	18°C	37°C 2015	12°C 1941	37%
Dec 12	25°C	18°C	41°C 1975	10°C 1962	37%
Dec 13	27°C	18°C	39°C 2016	11°C 1964	35%
Dec 14	27°C	19°C	40°C 2023	10°C 1959	36%
Dec 15	26°C	18°C	38°C 1972	11°C 1944	35%
Dec 16	27°C	19°C	40°C 1979	10°C 1946	35%
Dec 17	26°C	19°C	39°C 1945	12°C 1964	35%
Dec 18	27°C	19°C	43°C 1990	12°C 1976	36%
Dec 19	28°C	19°C	43°C 2025	13°C 1963	36%
Dec 20	27°C	19°C	42°C 1957	13°C 1948	37%
Dec 21	27°C	19°C	43°C 1994	12°C 1967	36%
Dec 22	27°C	19°C	39°C 2000	13°C 1949	34%
Dec 23	27°C	19°C	42°C 1972	13°C 1987	34%
Dec 24	27°C	19°C	42°C 2017	13°C 1985	33%
Dec 25	27°C	19°C	39°C 1957	14°C 1944	33%
Dec 26	27°C	19°C	39°C 1957	12°C 1968	32%
Dec 27	26°C	18°C	40°C 2024	12°C 1967	33%
Dec 28	26°C	18°C	38°C 1942	13°C 1945	33%
Dec 29	26°C	19°C	38°C 2016	13°C 2004	34%
Dec 30	27°C	19°C	37°C 1956	12°C 1970	34%
Dec 31	28°C	20°C	40°C 2019	13°C 1970	34%

Chance of rain

Chance of a wet day

Sunrise and sunset

Times for 2026, local time (GMT+11).

December 1: sunrise 5:37 AM, sunset 7:51 PM
December 31: sunrise 5:47 AM, sunset 8:09 PM

Every day of December: sun and moon

Other months

Sources

Records: NOAA GHCN-Daily, station ASN00066037, every year on file, quality-flagged values removed. Cloud, humidity, wind and sunshine: 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 2026-09-26. Sun and moon: computed with the NOAA solar equations and Meeus.