SeasonMapKatoomba (Blue Mountains) weather in December
Australia
December in Katoomba: warm, rainy, with clean air — an excellent time to visit.
#5 of 12 months in Katoomba · #259 of 1383 destinations to visit in December · comfort 86/100 (tier A)
Updated September 2026 · climate normals from ERA5 reanalysis
Traveller notes on Katoomba in December
Other months in Katoomba
Katoomba's forum calls November good, reliable spring weather for exploring the Blue Mountains — regulars flag that the altitude keeps it noticeably cooler than Sydney, by as much as 10°C on a given day, so it's worth packing a layer even on a warm-looking Sydney forecast.
Add your own note from Katoomba's card on the map.
Katoomba climate normals — December
| Daytime high | 24°C / 76°F | 🌤 warm |
|---|---|---|
| Nighttime low | 13°C / 55°F | |
| Feels like (high) | 24°C / 75°F | |
| Rainfall | 97 mm / 3.8 in | 🌧 rainy |
| Rainy days | 11 days | |
| Humidity | 70% | 💧 humid |
| Dew point | 10°C / 50°F | |
| Sunshine | 11.3 h/day | |
| Daylight | 14.3 h | |
| Wind | 14 km/h / 9 mph | |
| Air quality (US AQI) | 35 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Crowds in Katoomba 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 crowdsNew South Wales summer holidays, Summer holidays in Australia, school holidays in 3 of the markets that fill it(estimated)
Peak crowdsBusyShoulder seasonQuiet
Best months for Katoomba'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 weatherKatoomba's weather doesn't swing hard through the year — comfort stays fairly steady in every month.
What's on in Katoomba in December
Recurring seasonal events, natural spectacles, closures and holidays — curated and sourced.
- Hazard
Bushfire season
1 Oct – 1 Mar · usuallySmoke seasonClosuresThe whole town sits inside the national park, so a bad fire week means smoke, closed tracks and, on the worst days, a closed highway. The fire service rates the district daily. Source ↗
- Season
Canyoning season
1 Nov – 31 MarTrail seasonThe slot canyons below the escarpment are swum, not walked, so the guided trips run from November to March. Outside that the water is cold enough to make it a different sport.
- Holiday
New South Wales summer holidays
18 Dec – 27 Jan · usuallySchool holidaysCrowdedSydney drives up for the cool air over the summer break and the lookout car parks fill by mid-morning. The trains from Central are the easier way in on those weekends. Source ↗
Nearby, and something's on
Within 300 km of Katoomba — a day trip or a short hop — with something on this month. Never part of the comfort score.
Where is Katoomba?
Katoomba in December — FAQ
- Is December a good time to visit Katoomba?
- December in Katoomba: warm, rainy, with clean air — an excellent time to visit. It ranks #5 of 12 months for Katoomba on SeasonMap's comfort score (86/100).
- What is the weather like in Katoomba in December?
- In December, Katoomba averages a daily high of 24.3°C and a low of 12.5°C, with about 97.3 mm of rain over roughly 11.4 rainy days.
- What is the air quality in Katoomba in December?
- Katoomba has a mean US Air Quality Index of about 35 in December.
Other months in Katoomba
Compare Katoomba in December
Warmer or cooler than Katoomba in December
Similar destinations in Oceania — December
Within 300 km: Sydney's New Year's Eve fireworks on 31 Dec – 1 Jan.