Early spring · Weather & things to do
Blue Mountains in September
Blue Mountains warms up: highs climb to 59°F (15°C), from 52°F in August, with lows of 38°F (4°C) and about 1.6 in (41 mm) of rain.
September opens the best stretch on our comfort score, at 86/100 (3rd of 12).
- Avg high
- 59°F (15°C)
- Avg low
- 38°F (4°C)
- Rain
- 1.6 in (41 mm)
- Humidity
- 67%
- Cloud cover
- 47%
- Daylight
- ~11 h 48 min
- Comfort score
- 86/100 · Great
What September feels like
Expect mild afternoons around 59°F (15°C), good for long walks.
Lows average 38°F (4°C).
About 1.6 in (41 mm) of rain falls in a typical year's September.
Plan around September
September is one of Blue Mountains's best months on the climate data.
- Opens the best-scoring stretch on our comfort score: January, March & April and September – November.
- The year's biggest warm-up: highs jump 4°C (8°F) from August.
- Comfort improves from 74/100 in August to 86/100.
- September sits inside the May – Oct window our Sydney, Blue Mountains & the Reef route recommends.
What to pack for September
- A warm layer for eveningslows near 38°F
- Comfortable walking shoesmost picks involve some walking
What to do in Blue Mountains in September
With conditions on your side, the picks below favor time outside.
Zig Zag Railway
Heritage steam and diesel trains running down the 1860s zig-zag line from Clarence near Lithgow, with sandstone cuttings and viaducts.
Why now September scores 86/100 for comfort, good conditions for being outside.
Scenic World
Steep railway, cable car and skyway over the Jamison Valley, with rainforest boardwalks.
Why now Highs near 59°F and 1.6 in of monthly rain make this an easy outdoor pick.
Leura Mall
Tree-lined main street of Leura with cafes, homeware stores and garden shops.
Why now One to do outside while the weather is on your side.
Wentworth Falls
Tiered waterfall with lookouts and a cliff-edge track along the National Pass.
Govetts Leap Lookout
Lookout over the Grose Valley and Bridal Veil Falls near Blackheath.
Nearby in September
- Sydney in September~53 mi · highs 67°F, 1.7 in rain · 4°C (8°F) warmer by day, about as wet
NASA POWER 2001–2025 monthly averages on a ~50 km grid, temperatures adjusted from the grid cell's ~875 m to Blue Mountains's ~1,022 m elevation (standard lapse rate). Comfort scores weigh temperature, rain, humidity and cloud: see how we score each month. Check a forecast before you go.
Blue Mountains in September: quick answers
Is September a good time to visit Blue Mountains?
Yes. On the climate data it's one of the best months, scoring 86/100. Expect highs of 59°F (15°C) and 1.6 in (41 mm) of rain. September is inside the May – Oct window our Sydney, Blue Mountains & the Reef route recommends.
How cold is Blue Mountains in September?
Average highs are 59°F (15°C) and average lows 38°F (4°C), making it the 5th-coldest month by daytime highs.
Does it rain a lot in Blue Mountains in September?
Not much: about 1.6 in (41 mm) of rain falls across September on average, the 3rd-driest month of the year. The annual total is about 29.5 in (749 mm).
What should I pack for Blue Mountains in September?
Bring a warm layer for evenings (lows near 38°F) and comfortable walking shoes (most picks involve some walking).
More on Blue Mountains
Routes in season in September
- Sydney, Blue Mountains & the Reef May – Oct
Planning Blue Mountains in September?
Bring the crew into one shared trip: vote on dates, build the day-by-day plan, split costs and share one packing list.