SeasonMapKangaroo Island (Kingscote) weather in December
Australia
December in Kangaroo Island: warm, dry, with clean air — an excellent time to visit.
#4 of 12 months in Kangaroo Island · #290 of 1383 destinations to visit in December · comfort 85/100 (tier A)
Updated September 2026 · climate normals from ERA5 reanalysis
Traveller notes on Kangaroo Island in December
Other months in Kangaroo Island
Kangaroo Island's forum calls February usually the hottest month in the south, part of a Mediterranean climate with warm summer days that rarely turn genuinely uncomfortable. Regulars are split on how much to love it — some rate February among the best months, others avoid it for the heat — and are unanimous that wind off the ocean is a constant here year-round, worth a windbreaker regardless of season.
Add your own note from Kangaroo Island's card on the map.
Kangaroo Island climate normals — December
| Daytime high | 24°C / 76°F | 🌤 warm |
|---|---|---|
| Nighttime low | 12°C / 53°F | |
| Feels like (high) | 24°C / 75°F | |
| Sea temperature | 18°C / 64°F | 🧊 bracing |
| Rainfall | 23 mm / 0.9 in | ☀️ dry |
| Rainy days | 4 days | |
| Humidity | 66% | 💧 humid |
| Dew point | 11°C / 51°F | |
| Sunshine | 12.3 h/day | |
| Daylight | 14.5 h | |
| Wind | 23 km/h / 15 mph | |
| Air quality (US AQI) | 27 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Crowds in Kangaroo Island in December
How busy the place itself is — school and mass holidays, the months an editor tagged, and how sought-after the weather makes them. Never part of the comfort score.
Peak crowdsSouth Australian summer holidays, Summer holidays in Australia, school holidays in 3 of the markets that fill it(estimated)
Peak crowdsBusyShoulder seasonQuiet
Best months for Kangaroo Island's weather
Ranked by this destination's own climate comfort score across the year — a different thing from how busy it gets (see Crowds above).
Fair weatherKangaroo Island's weather peaks January–March, best around February.
Best weatherFair weatherToughest weather
What's on in Kangaroo Island in December
Recurring seasonal events, natural spectacles, closures and holidays — curated and sourced.
- Rule
Seal Bay, ranger access only
1 Jan – 31 DecBook earlyThe sea lion beach can only be walked with a ranger on a timed tour, and the boardwalk above it is the alternative. Tours sell out in the holidays, so book before you take the ferry. Source ↗
- Closure
Fire danger season closures
15 Nov – 15 Apr · usuallyRiskNational parks here close on catastrophic fire danger days, which lands squarely in the summer holidays. The island burned across a third of its area in 2020 and takes the ratings seriously. Source ↗
- Holiday
South Australian summer holidays
12 Dec – 27 Jan · usuallySchool holidaysCrowdedBook earlyAdelaide comes across for the summer break and the ferry crossings for cars fill weeks ahead. It is the one time of year the island's roads feel busy. Source ↗
Where is Kangaroo Island?
Kangaroo Island in December — FAQ
- Is December a good time to visit Kangaroo Island?
- December in Kangaroo Island: warm, dry, with clean air — an excellent time to visit. It ranks #4 of 12 months for Kangaroo Island on SeasonMap's comfort score (85/100).
- What is the weather like in Kangaroo Island in December?
- In December, Kangaroo Island averages a daily high of 24.4°C and a low of 11.9°C, with about 22.8 mm of rain over roughly 3.7 rainy days.
- What is the air quality in Kangaroo Island in December?
- Kangaroo Island has a mean US Air Quality Index of about 27 in December.