Adelaide weather in December
Temperature, sea and sunshine in December: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in December
Excellent
Best time to visit: October – April
What is the weather like in Adelaide in December?
In December, Adelaide is warm: daytime highs average 26 °C, and nights cool down to about 15 °C. The sea averages 19.9 °C – bracing, so a wetsuit helps for longer swims. With around 10 hours of sunshine a day, there is plenty of sun. Rain is rare: about 4 days bring 22 mm in total. On about 7 days the thermometer climbs to 30 °C or more. All in all, December is an excellent month for a holiday in Adelaide.
December compared
How the weather changes from November to January. Tap a month to open it.
| NovemberNov | DecemberDec | JanuaryJan | |
|---|---|---|---|
| Score | 98 | 100 | 91 |
| Day | 24° | 26° | 28° |
| Night | 13° | 15° | 17° |
| Sea | 18° | 20° | 22° |
| Sun | 10 h | 10 h | 11 h |
| Rain days | 5 | 4 | 3 |
More details for December
- Daylight
- 14 h 29 min05:56 – 20:25
- UV index
- 11 · extremeclear sky, noon (estimate)All months
- Muggy days
- 0 daysdew point 18 °C or moreAll months
- Wind
- 24 km/haverage daily peakAll months
- Cloud cover
- 41 %on averageAll months
- Hot days
- 7 days30 °C or moreAll months
- Time zone
- UTC+10:30Australia/Adelaide
How the score comes together
- Temperatureweight 50 %100 %
- Sunshineweight 20 %100 %
- Few rainy daysweight 30 %99 %
Each factor is rated from 0 to 100 % and weighted for the travel style “City break”.
What to pack in December
- Wetsuit for longer swims
- Sunscreen
- Sunglasses & sun hat
- Light, breathable clothes
- A jumper for the evenings
Adelaide in December: quick answers
Is Adelaide hot in December?
Warm rather than hot: in December, daytime highs in Adelaide average 26 °C and nights cool to about 15 °C. On about 7 days the thermometer climbs to 30 °C or more.
Can you swim in Adelaide in December?
Only if you don't mind cold water: in December the sea averages just 19.9 °C. Comfortable swimming is possible from January to March.
Does it rain much in Adelaide in December?
Rain is rare: about 4 days bring 22 mm in total.
Adelaide month by month
The whole year in AdelaideAll destinations: AustraliaWhere to go in DecemberSea temperature in December
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences