December · Australia
Best time to visit Blue Mountains in December Weather, crowds & prices
Weather in Blue Mountains in December
Average temperature 19°C, 60 mm of rain, about 31 days with 6+ hours of sunshine and 64% humidity — based on the five most recent complete years of ERA5 data (2021–2025).
December score
9.5/10
Ranked #1 of 12 months
- Avg temp
- 19°C
- Rainfall
- 60 mm
- Humidity
- 64%
- Days with 6h+ sun
- 31
- Crowd Density
- Peak Tourist Rush
- Average Expenses
- $$$ · Peak Season Rates ($$$)
December in Blue Mountains scores 9.5/10 for nature and wildlife travel - the single best month of the year. Expect around 19°C, 60 mm of rain, and roughly 31 days with 6+ hours of sunshine this month.
The Blue Mountains' eucalyptus haze, cliffs and Three Sisters rise west of Sydney.
December: the best month of the year in Blue Mountains
Temperatures hover around 19°C (66°F) — the kind of month where neither heat nor cold forces the schedule.
Budget for roughly 60 mm of rain this month — a flexible day or two helps — with about 31 days with 6+ hours of sunshine and 14.2 hours of daylight to work around it.
On our climate-comfort scale this is the top-ranked month of the year for Blue Mountains at 9.5/10 — the reference point every other month on this page is measured against.
Pack layers you can shed by midday plus one warm layer for the evening, a packable rain layer, footwear you can get muddy.
Budget for peak pricing, and this is one of the busiest months here. You are paying the year's highest rates for the year's best conditions — book early or shift a few weeks either side.
Frequently asked
- What is the weather like in Blue Mountains in December?
- In December, Blue Mountains averages 19°C, 60 mm of rain, and about 31 days with 6+ hours of sunshine. Its climate-comfort score is 9.5/10.
- Is December a good time to visit Blue Mountains?
- December earns a 9.5/10 climate-comfort score. Use the year-round chart to weigh the weather against your budget and crowd preferences.
- How much does it rain in Blue Mountains in December?
- Expect about 60 mm of rain in December. Average humidity is 64% and there are about 31 days with 6+ hours of sunshine.
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Blue Mountains, Australia. Live activities and tours from GetYourGuide, matched to this destination.