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Sydney in September: Weather, Average temperature and Climate

Planning a trip and want to know what the weather in Sydney in September will be like? Take a look at our weather guide for Sydney, based on historical data.
Check flight prices to Sydney on Avionero:
September

Weather in Sydney in September 2025

Good Weather
Mild
☀️
Sunny
🌊
Fresh water
Planning a trip to Sydney in September? You are in luck! The weather is generally good, with an average maximum temperature of +20°C and approximately 13 sunny days. Just be prepared for some rain, as there are usually around 11 rainy days and 46 mm of precipitation. Expect good weather and pack accordingly to enjoy the outdoors. Search flights in one click on Avionero.
Good to know:
  • September is usually the driest month of the year in Sydney

Average weather

☀️
+20°C
Avg. max. temperature
+6°C
Min.
+34°C
Max.
46 mm
Total precipitation
62%
Avg. humidity
4 m/s
Avg. wind
13 ☀️
Sunny Days
4 ⛅️
Cloudy
11 🌦
Rainy
Our opinion: Sydney has good weather in September.

Average temperature in Sydney in September

Here are the expected maximum, average and minimum temperatures in Sydney for September based on the historical data.
Last Year
Historical Data

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:

The warmest water temperatures in Sydney are reached in February, when the average sea temperature rises to +24°C. The coldest water temperatures are in September, with an average of +19°C.

Can you swim in Sydney in September?

Water temperature (+19°C) in Sydney in September might be suited for short swims and acclimatized swimmers might find it refreshing.
🦭
Cold
Below +16°C
🏄‍♂️
Fresh
16°C - 21°C
🏊
Comfortable
21°C - 25°C
👙
Warm
25°C - 28°C
🔥
Very warm
+28°C and up
Think of bringing a full-body or shorty wetsuit (3mm-5mm thickness) to provide insulation and maintain body heat.

Climate in Sydney in September

Sydney weather looks like this, on average, in September and the surrounding months.
AugustSeptemberOctober
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 mm46 mm60 mm
Wind
4 m/s4 m/s4 m/s
Avg. water temperature
+19°C+19°C+19°C
Humidity
63%62%64%
Air pressure
1017 HPa1016 HPa1015 HPa
Sunny days
151310
Cloudy days
446
Rainy days
111113
Snowy days
000

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

Wind speed in Sydney in September based on historical data.
Last Year
Historical Data

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

Amount of rainfall in mm during September in Sydney based on historical data.
Last Year
Historical Data
Typically, there is a 27% chance of rain on an average day in September, with total rainfall of approximately 31 mm. The maximum amount of rainfall per day is around 9 mm, which is considered light rain. On average, there are about 8 rainy days during September, so prepare to bring an umbrella.
Here’s how September is compared with other months in the amount of precipitation, total mm:
Sydney wettest month is March, where a typical day has a 58% chance of precipitation and 106 mm of rainfall per day. September, on the other hand, is the driest month with a mere 37% chance of precipitation and 46 mm of rainfall per day.

How was the weather last September in Sydney?

This is the weather in Sydney in September 2023:
1 September
☁️
+17°C
2 September
☁️
+18°C
3 September
☁️
+18°C
4 September
☁️
+21°C
5 September
☀️
+24°C
6 September
☀️
+19°C
7 September
☀️
+25°C
8 September
🌧️
+18°C
9 September
☀️
+18°C
10 September
☀️
+18°C
11 September
☀️
+19°C
12 September
☀️
+19°C
13 September
☀️
+22°C
14 September
☀️
+24°C
15 September
☀️
+25°C
16 September
☀️
+29°C
17 September
☀️
+32°C
18 September
☀️
+29°C
19 September
☀️
+32°C
20 September
☀️
+33°C
21 September
☁️
+22°C
22 September
☀️
+17°C
23 September
☁️
+19°C
24 September
☀️
+20°C
25 September
☀️
+23°C
26 September
☁️
+20°C
27 September
🌧️
+23°C
28 September
☀️
+21°C
29 September
☀️
+26°C
30 September
☀️
+26°C
In September 2023 Sydney had 21 sunny days, 7 cloudy days, and 2 rainy days. The average maximum temperature was +23°C, with an absolute maximum of +33°C and a minimum of +17°C. The average humidity was 69%, with a maximum of 100% and a minimum of 25%. The average wind speed was 4 m/s, with a maximum of 13 m/s and a minimum of 0 m/s.
Are you planning a trip in September?

Climate Change over Years

This is how Sydney climate have been changing during last 43 years period.

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

Frequently asked questions about the weather in Sydney in September:

Is September a good time to visit Sydney?

September is a really good time to go to Sydney. The weather is nice so plan your packing around outdoor activities and exploring. Check out other good time to visit Sydney.

Can you sunbathe in Sydney in September?

September has mild temperatures in Sydney. Not ideal for sunbathing, but still good for daytime outdoor activities, but plan for cool evenings. Pack a light jacket and shorts!

Can you swim in Sydney in September?

In general, you can swim in Sydney in September, if you want to, at an average water temperature of +19°C. But it will feel quite cool, and some precautions are necessary to ensure your comfort and safety.

Is Sydney rainy in September?

Sydney is usually dry in September. Plan your packing around outdoor activities and exploring.

Is it sunny in Sydney in September?

The amount of sunny days in Sydney during September varies; prepare for a mix of clouds and sun.

Other cities in Australia

Check out the weather for 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.