SeasonMapKatoomba (Blue Mountains) weather in September
Australia
September in Katoomba: cool, a little rain, with clean air — an excellent time to visit.
#3 of 12 months in Katoomba · #321 of 1383 destinations to visit in September · comfort 88/100 (tier A)
Updated September 2026 · climate normals from ERA5 reanalysis
Traveller notes on Katoomba in September
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 — September
| Daytime high | 16°C / 60°F | 🙂 cool |
|---|---|---|
| Nighttime low | 6°C / 42°F | |
| Feels like (high) | 13°C / 55°F | |
| Rainfall | 62 mm / 2.5 in | 🌦 some rain |
| Rainy days | 8 days | |
| Humidity | 68% | 💧 humid |
| Dew point | 3°C / 37°F | |
| Sunshine | 9.8 h/day | |
| Daylight | 11.9 h | |
| Wind | 16 km/h / 10 mph | |
| Snowfall | 0.4 cm / 0.2 in | |
| Air quality (US AQI) | 30 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Crowds in Katoomba in September
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.
BusySpring break in Australia, school holidays in 2 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 September
Recurring seasonal events, natural spectacles, closures and holidays — curated and sourced.
- Nature
Waratahs and heath in flower
15 Sep – 15 Nov · usuallyWildflowers & bloomsWaratahs come out along the cliff-top tracks in spring, with the heath and boronia around them. It is the best walking window of the year, before the summer heat and the fire bans.
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 September — FAQ
- Is September a good time to visit Katoomba?
- September in Katoomba: cool, a little rain, with clean air — an excellent time to visit. It ranks #3 of 12 months for Katoomba on SeasonMap's comfort score (88/100).
- What is the weather like in Katoomba in September?
- In September, Katoomba averages a daily high of 15.8°C and a low of 5.8°C, with about 62.3 mm of rain over roughly 8.2 rainy days.
- What is the air quality in Katoomba in September?
- Katoomba has a mean US Air Quality Index of about 30 in September.
Other months in Katoomba
Compare Katoomba in September
Warmer or cooler than Katoomba in September
Similar destinations in Oceania — September
Within 300 km: Sydney's Humpback migration around 15 May – 15 Nov, and Canberra's Floriade on 12 Sep – 11 Oct.