How warm is it in Sydney in December?

Daytime highs averaged 24.9 °C, night-time lows 19.2 °C. The highest value of the past 10 years was 37.6 °C (19 Dec 2019), the lowest 14.2 °C (16 Dec 2022).

How often does it rain in Sydney in December?

On average there were 10.6 rain days (at least 1 mm) with 68.2 mm of precipitation in total. In 1 of 10 years there was no rain day at all.

How warm is the sea in Sydney in December?

The sea temperature averaged 21.2 °C (open-sea point approx. 10 km from the town).

Holiday Weather Rewind

Destinations Method & data

Loading weather data…

We are fetching the daily values for every year. The first time, this takes a few seconds.

Sydney weather in December: temperature & rain

Photo: Diliff · CC BY-SA 3.0

🇦🇺 Weather in Sydney in December

This is what the weather in Sydney (New South Wales, Australia) was like in December over the years 2016–2025.

Key facts at a glance

Prevailing weather: Partly cloudy

Avg. daytime high

24.9 °C

22.5 °C – 26.1 °C

Avg. night-time low

19.2 °C

17.3 °C – 20.1 °C

Avg. rain days in period

10.6

34 % of days · ≥ 1.0 mm

Avg. precipitation in period

68.2 mm

2.0 mm – 124 mm

Avg. cloud cover

58 %

This data source has no sunshine hours – average cloud cover is shown instead.

Avg. sea temperature

21.2 °C

Sea temperature available for 8 of 10 years.

Extremes: Highest temperature 37.6 °C (19 Dec 2019) · Lowest temperature 14.2 °C (16 Dec 2022) · Avg. daily peak wind 22 km/h

Weather mix of all days

72Sunny
84Partly cloudy
48Cloudy
69Light rain
37Rain

Summary

On average 24.9 °C during the day and 19.2 °C at night.
On average 10.6 rain days (Rain day = at least 1.0 mm of precipitation) with 68.2 mm of precipitation in total.
In 1 of 10 years there was not a single rain day.
The sea averaged 21.2 °C.
Prevailing weather: Partly cloudy.
Warmest year: 2017 (avg. 26.1 °C), coolest: 2022 (avg. 22.5 °C).
Wettest year: 2023 (124 mm), driest: 2019 (2.0 mm).
Extremes: 37.6 °C on 19 Dec 2019 and 14.2 °C on 16 Dec 2022.

Overall values from all 10 years. How is this calculated?

Temperatures per year

Average over your travel period

Precipitation & rain days

Year by year

2025
Avg. max25.7°Avg. min19.0°
Rain days
11 Rain days
Precipitation
50.9 mm
Avg. cloud cover
58 % cloudy
Sea temperature
21.7 °C
Max 37.3 °C · Min 15.1 °C
2024
Avg. max25.8°Avg. min20.0°
Rain days
8 Rain days
Precipitation
33.1 mm
Avg. cloud cover
45 % cloudy
Sea temperature
21.4 °C
Max 31.8 °C · Min 17.5 °C
2023
Avg. max25.6°Avg. min20.1°
Rain days
14 Rain days
Precipitation
124 mm
Avg. cloud cover
57 % cloudy
Sea temperature
–
Max 35.9 °C · Min 18.4 °C
2022
Avg. max22.5°Avg. min17.3°
Rain days
8 Rain days
Precipitation
30.5 mm
Avg. cloud cover
54 % cloudy
Sea temperature
20.5 °C
Max 29.0 °C · Min 14.2 °C
2021
Avg. max23.4°Avg. min19.0°
Rain days
16 Rain days
Precipitation
89.8 mm
Avg. cloud cover
66 % cloudy
Sea temperature
22.7 °C
Max 30.0 °C · Min 16.0 °C
2020
Avg. max23.8°Avg. min18.9°
Rain days
19 Rain days
Precipitation
109 mm
Avg. cloud cover
75 % cloudy
Sea temperature
20.9 °C
Max 31.6 °C · Min 16.4 °C
2019
Avg. max25.7°Avg. min18.7°
Rain days
0 Rain days
Precipitation
2.0 mm
Avg. cloud cover
52 % cloudy
Sea temperature
20.7 °C
Max 37.6 °C · Min 15.2 °C
2018
Avg. max24.9°Avg. min19.3°
Rain days
11 Rain days
Precipitation
118 mm
Avg. cloud cover
48 % cloudy
Sea temperature
20.7 °C
Max 29.9 °C · Min 16.3 °C
2017
Avg. max26.1°Avg. min19.9°
Rain days
13 Rain days
Precipitation
56.7 mm
Avg. cloud cover
60 % cloudy
Sea temperature
21.2 °C
Max 34.3 °C · Min 17.7 °C
2016
Avg. max26.0°Avg. min19.8°
Rain days
6 Rain days
Precipitation
67.9 mm
Avg. cloud cover
63 % cloudy
Sea temperature
–
Max 33.6 °C · Min 17.4 °C

Frequently asked questions

How warm is it in Sydney in December?: Daytime highs averaged 24.9 °C, night-time lows 19.2 °C. The highest value of the past 10 years was 37.6 °C (19 Dec 2019), the lowest 14.2 °C (16 Dec 2022).
How often does it rain in Sydney in December?: On average there were 10.6 rain days (at least 1 mm) with 68.2 mm of precipitation in total. In 1 of 10 years there was no rain day at all.
How warm is the sea in Sydney in December?: The sea temperature averaged 21.2 °C (open-sea point approx. 10 km from the town).

Check your exact travel dates

Choose your travel period – we show the weather for exactly those days.

Data sources

Weather data: Data obtained from the NASA Langley Research Center (LaRC) POWER Project funded through the NASA Earth Science/Applied Science Program
Reanalysis (weather model constrained by observations) on a coarse grid of about 50 km. Values represent a large area and can differ from local conditions, especially on islands, coasts and in mountains. Snow depth is the model value for the grid cell, not the depth on the slopes. No sunshine duration.
Reanalysis (weather model constrained by observations)
Reanalysis values represent a grid cell (approx. 25–50 km) and may differ from local measurements on coasts, islands and in mountains.
Sea temperature: MUR SST data were provided by JPL under support by NASA MEaSUREs program; accessed via NOAA CoastWatch ERDDAP
Daily multi-scale ultra-high resolution (≈ 1 km) analysis of satellite measurements (infrared, microwave) and in-situ data. Represents the foundation temperature below the daily warm surface layer. (Satellite and in-situ analysis); Sea measuring point approx. 10 km from the location (-33.870, 151.320)
Place search: Natural Earth (public domain) · GeoNames (CC BY 4.0) / OpenStreetMap (ODbL)