September · Australia
Best time to visit Sydney in September Weather, crowds & prices
Weather in Sydney in September
Average temperature 16°C, 58 mm of rain, about 28 days with 6+ hours of sunshine and 66% humidity — based on the five most recent complete years of ERA5 data (2021–2025).
September score
9.2/10
Ranked #1 of 12 months
- Avg temp
- 16°C
- Rainfall
- 58 mm
- Humidity
- 66%
- Days with 6h+ sun
- 28
- Crowd Density
- Moderate Crowds
- Average Expenses
- $$$ · Peak Season Rates ($$$)
September in Sydney scores 9.2/10 for sightseeing and cultural travel - the single best month of the year. Expect around 16°C, 58 mm of rain, and roughly 28 days with 6+ hours of sunshine this month.
Sydney reveals its true character from the water: harbor ferries, sandstone headlands, ocean pools, and long golden evening light converge in spring and early summer.
September in Sydney — the year's strongest window
September averages 16°C (61°F), the range most people find easiest for walking a city all day without either overheating or losing daylight to weather.
Rainfall runs 58 mm, so plan one flexible day in three; you still get about 28 days with 6+ hours of sunshine and 11.9 hours of daylight.
On our climate-comfort scale this is the top-ranked month of the year for Sydney at 9.2/10 — 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.
Plan for peak pricing, with crowds are moderate. 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 Sydney in September?
- In September, Sydney averages 16°C, 58 mm of rain, and about 28 days with 6+ hours of sunshine. Its climate-comfort score is 9.2/10.
- Is September a good time to visit Sydney?
- September earns a 9.2/10 climate-comfort score. Use the year-round chart to weigh the weather against your budget and crowd preferences.
- How much does it rain in Sydney in September?
- Expect about 58 mm of rain in September. Average humidity is 66% and there are about 28 days with 6+ hours of sunshine.
Curated in Sydney
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Sydney, Australia. Live activities and tours from GetYourGuide, matched to this destination.