Weather in Sydney in September 2025
- September is usually the driest month of the year in Sydney
Average weather
Average temperature in Sydney in September
Going from a maximum of +33°C during the day to a minimum of +7°C during the night, the temperature in September averages around +23°C.
The average maximum temperature goes up 35% by the end of the month, compared with the beginning of the month, from +17°C to +26°C.
Is Sydney warm or cold in September?
Sydney is typically mild in September.
Maximum temperatures go up compared to the previous month from +18°C to +20°C. The minimum temperature also goes up from +9°C to +12°C.
Pack a light jacket as it will be warm in the day and cool in the evenings.
Take a look at how September is compared to other months in Sydney:
Water temperature in Sydney in September
Water in Sydney in September is Fresh. It varies from +17°C to +20°C, with an average of +19°C. This is almost similar to the air temperature, which averages +20°C.
The water temperature in September is one of the coldest of the entire year:
Can you swim in Sydney in September?
Climate in Sydney in September
| August | September | October | ||||
|---|---|---|---|---|---|---|
| Avg. temperature | ||||||
| +18°C | +20°C | +22°C | ||||
| Min. temperature | ||||||
| +4°C | +6°C | +7°C | ||||
| Max. temperature | ||||||
| +29°C | +34°C | +37°C | ||||
| Rainfall | ||||||
| 53 mm | 46 mm | 60 mm | ||||
| Wind | ||||||
| 4 m/s | 4 m/s | 4 m/s | ||||
| Avg. water temperature | ||||||
| +19°C | +19°C | +19°C | ||||
| Humidity | ||||||
| 63% | 62% | 64% | ||||
| Air pressure | ||||||
| 1017 HPa | 1016 HPa | 1015 HPa | ||||
| Sunny days | ||||||
| 15 | 13 | 10 | ||||
| Cloudy days | ||||||
| 4 | 4 | 6 | ||||
| Rainy days | ||||||
| 11 | 11 | 13 | ||||
| Snowy days | ||||||
| 0 | 0 | 0 | ||||
September weather is still as good as in August. It’s getting warmer as September arrives. The average maximum temperature goes up from +18°C to +20°C during the day. As September arrives, the amount of rainfall goes down. On average, the rainfall volume decreases from 53 mm to 46 mm. It feels drier, as humidity decreases from 63% to 62%. The average wind speed doesn’t change much during September, staying around 4 m/s. The days becoming less sunny, going from 15 sunny days in August to 13 in September.
October brings much the same weather, it remains good.
Wind
The average wind speed is 4 m/s getting up to 7 m/s which is a medium breeze. You can feel it, especially getting out of the water.
The average wind speed in Sydney is gradually decreasing during September, going from 7 m/s to 4 m/s over the course of the month.
Rain
How was the weather last September in Sydney?
Climate Change over Years
The climate in Sydney in September has not changed much over the last 43 years.
The average temperature was the lowest in 1992 (+20°C) and the highest in 2019 (+23°C). The driest year was 2006 with only 423 mm of rainfall, and the wettest year was 2022 with 2786 mm.
FAQ
Is September a good time to visit Sydney?
Can you sunbathe in Sydney in September?
Can you swim in Sydney in September?
Is Sydney rainy in September?
Is it sunny in Sydney in September?
Other cities in Australia
Monthly weather in Sydney
Source of the data
For this page, we’ve looked at the typical weather in Sydney, based on historical hourly weather data from January 1, 1979, to December 31, 2023.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.