nomadseason

September Weather in Perth, Canada

Last updated: June 18, 2025

In Perth, Canada, the average temperature in September hovers around 16°C (61°F), with a minimum that can dip to 1°C (33°F) and a maximum reaching up to 32°C (89°F). Expect about 55 mm (2.2 in) of precipitation spread over 9 days, contributing to an overall average humidity of 72%. Pack wisely to stay comfortable!

September Temperature in Perth

In September in Perth, the average temperature is 16°C (61°F). The maximum can reach 32°C (89°F), while the minimum can drop as low as 1°C (33°F). Be prepared for a wide range of temperatures during your travels!

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

The chart illustrates September temperature patterns in Perth, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Perth, September typically has an average temperature of 16°C (61°F), with highs reaching up to 32°C (89°F) and lows dropping to around 1°C (33°F).
JanFebMarAprMayJunJulAugSepOctNovDec182029425464706861493424
Data source: Temperature data for Perth generated using information from the Copernicus Climate Change Service.
Choose your preferred temperature unit
The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Perth

In Perth in September, the precipitation amount is 55 mm (2.2 in) over a span of 9 days.

September Precipitation Trends in Perth

The chart displays monthly precipitation patterns in Perth, 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 Perth, September typically receives around 55 mm (2.2 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec7272751151028510787551268976
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

September Humidity in Perth

In Perth in September humidity is 72%. With an average temperature of 16°C (61°F), this humidity feels like a damp blanket wrapping around you, making every step feel heavier and requiring extra effort while traveling.

September Average Humidity in Perth

This chart illustrates the average monthly humidity levels in Perth, 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 Perth is approximately 72%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec93%93%86%82%75%68%69%67%72%83%88%89%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Perth

In Perth 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 Perth.

Maximum UV Index Levels in Perth for September

The chart shows the monthly maximum UV Index (UVI) for Perth 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 Perth typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec245899987532
Data source: Perth 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 Perth Compares to Other Months

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

This table compares monthly weather conditions in Perth, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-8°C (18°F)72 mm (2.8 inches)93%low
February Weather-7°C (20°F)72 mm (2.8 inches)93%moderate
March Weather-2°C (29°F)75 mm (2.9 inches)86%moderate
April Weather5°C (42°F)115 mm (4.5 inches)82%very high
May Weather12°C (55°F)102 mm (4.0 inches)75%very high
June Weather18°C (64°F)85 mm (3.3 inches)68%very high
July Weather21°C (71°F)107 mm (4.2 inches)69%very high
August Weather20°C (69°F)87 mm (3.4 inches)67%very high
September Weather16°C (61°F)55 mm (2.2 inches)72%high
October Weather10°C (49°F)126 mm (5.0 inches)83%moderate
November Weather1°C (35°F)89 mm (3.5 inches)88%moderate
December Weather-4°C (25°F)76 mm (3.0 inches)89%low

Compare Perth's Climate with Cities Worldwide