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September Weather in Sydney, Canada

Last updated: June 18, 2025

In September, the average temperature in Sydney, Canada hovers around 16°C (60°F), offering a pleasant climate for visitors. Expect minimums as low as 6°C (43°F) and maximums reaching 26°C (79°F). With an average precipitation of 93 mm (3.7 in) spread over 11 days, you may want to pack an umbrella! Additionally, the average humidity is a cozy 86%, creating a mildly tropical atmosphere.

September Temperature in Sydney

In September in Sydney, the average temperature is 16°C (60°F), with maximums reaching 26°C (79°F) and minimums dropping as low as 6°C (43°F). This mild climate makes it a great time for travelers to explore the area comfortably.

September Weather in Sydney: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Sydney, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Sydney, September typically has an average temperature of 16°C (60°F), with highs reaching up to 26°C (79°F) and lows dropping to around 6°C (43°F).
JanFebMarAprMayJunJulAugSepOctNovDec272528374455646860514133
Data source: Temperature data for Sydney generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Sydney

In Sydney in September, the precipitation amount is 93 mm (3.7 in) over the course of 11 days, indicating that rain is expected to be fairly frequent during that time.

September Precipitation Trends in Sydney

The chart displays monthly precipitation patterns in Sydney, with values for each month alongside September’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how September’s conditions compare to those of other months. In Sydney, September typically receives around 93 mm (3.7 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec113131118140109102936893108182134
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Sydney

In Sydney in September humidity is 86%. With an average temperature of 16°C (60°F), this humidity feels like a warm, heavy blanket enveloping you, making travel feel sweat-inducing and somewhat stifling, as you navigate the sticky air that clings to your skin with each step.

September Average Humidity in Sydney

This chart illustrates the average monthly humidity levels in Sydney, with September’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In September, average humidity in Sydney is approximately 86%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%87%87%87%88%89%91%90%86%82%83%83%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Sydney

In Sydney in September, the maximum UV index is 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more detailed information, you can check the Hourly UV Index in Sydney.

Maximum UV Index Levels in Sydney for September

The chart shows the monthly maximum UV Index (UVI) for Sydney in September, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In September, the maximum UV index in Sydney typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec2357910887532
Data source: Sydney September UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How September Weather in Sydney Compares to Other Months

Weather in Sydney varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Sydney, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Sydney, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-3°C (27°F)113 mm (4.5 inches)86%low
February Weather-4°C (25°F)131 mm (5.2 inches)87%moderate
March Weather-2°C (29°F)118 mm (4.6 inches)87%moderate
April Weather3°C (37°F)140 mm (5.5 inches)87%high
May Weather7°C (45°F)109 mm (4.3 inches)88%very high
June Weather13°C (55°F)102 mm (4.0 inches)89%very high
July Weather18°C (64°F)93 mm (3.7 inches)91%very high
August Weather20°C (68°F)68 mm (2.7 inches)90%very high
September Weather16°C (60°F)93 mm (3.7 inches)86%high
October Weather10°C (51°F)108 mm (4.2 inches)82%moderate
November Weather5°C (42°F)182 mm (7.2 inches)83%moderate
December Weather0°C (33°F)134 mm (5.3 inches)83%low

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