Sydney Weather in September
Australia · Oceanic climate · Data averaged from 2020-01-01 to 2024-12-31 (5 years)
September in Sydney sees average temperatures ranging from a low of 10.6°C (51.1°F) to a high of 21.1°C (70.0°F), with a mean of 15.7°C (60.3°F). Compared to the annual average of 17.3°C (63.1°F), this month is 1.6°C cooler than the yearly norm. Precipitation averages 50.9mm, making it approximately 49.0mm drier than the monthly average of 100.0mm. This is the driest month of the year, with just 50.9mm of precipitation. The city receives an average of 10.1 hours of sunshine per day during September, with relative humidity averaging 66.9%. Wind speeds reach an average maximum of 22.4 km/h. For travelers, this month offers a temperature experience in Sydney, with drier-than-average conditions compared to the rest of the year.
The numbers show something travelers often miss: Sydney's 'winter' (June-August) averages 17°C — warmer than London's summer. I spent a July there expecting cold and instead got perfect hiking weather. The real challenge is the UV index in summer (December-February). The data is clear: if you're planning beach days, March-April give you warmth without the extreme UV. Christmas on the beach still feels wrong to me, but the locals love it.
September vs Adjacent Months
| Metric | August | September | October |
|---|---|---|---|
| Mean Temp | 13.3°C (55.9°F) | 15.7°C (60.3°F) | 17.4°C (63.3°F) |
| Rainfall | 57.8mm | 50.9mm | 94.3mm |
| Sunshine | 9.0 hrs | 10.1 hrs | 10.1 hrs |
| Humidity | 71.2% | 66.9% | 71.5% |
| Wind | 20.0 km/h | 22.4 km/h | 22.6 km/h |
| Rainy Days | 13.8 | 13.0 | 18.2 |
Seasonal Context
September falls in Autumn in the Northern Hemisphere. Autumn sees temperatures gradually cooling from summer highs. For travelers visiting Sydney in September, the data indicates favorable conditions based on the combination of temperature, precipitation, and daylight hours.
Frequently Asked Questions
What is the average temperature in Sydney in September?
The average temperature in Sydney during September ranges from 10.6°C (51.1°F) to 21.1°C (70.0°F), with a mean of 15.7°C (60.3°F).
How much does it rain in Sydney in September?
Sydney receives an average of 50.9mm of precipitation in September, spread across approximately 13.0 rainy days. This is the driest month of the year.
What should I pack for Sydney in September?
Based on September weather data, pack layers including light jackets and t-shirts, plus an umbrella.
Is September a good time to visit Sydney?
September is a good time to visit Sydney, with comfortable temperatures and manageable rainfall.
Other Months for Sydney
Cities with Similar September Climate (Oceanic)
Data Source: Open-Meteo historical archive (2020-01-01 to 2024-12-31). Daily measurements aggregated into monthly climate normals. Coordinates: -33.87°, 151.21°. Timezone: Australia/Sydney. Last updated: 2026-07-30.