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September Weather in Joondalup, Australia

Last updated: August 22, 2025

In Joondalup, Australia, the average temperature in September is a pleasant 15°C (60°F). Enjoy mild weather with temperatures ranging from a comfortable 7°C (44°F) to a warm 29°C (85°F). Expect some light rain with an average precipitation of 39 mm (1.5 in) spread over 8 days, contributing to an average humidity of 61%.

September Temperature in Joondalup

In September in Joondalup, the average temperature is 15°C (60°F). Maximums can reach 29°C (85°F) and minimums can be as low as 7°C (44°F). This mild climate makes Joondalup an ideal destination for travelers seeking pleasant weather and outdoor activities.

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

The chart illustrates September temperature patterns in Joondalup, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Joondalup, September typically has an average temperature of 15°C (60°F), with highs reaching up to 29°C (85°F) and lows dropping to around 7°C (44°F).
JanFebMarAprMayJunJulAugSepOctNovDec757573686259585760636773
Data source: Temperature data for Joondalup 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 Joondalup

In Joondalup in September, the precipitation amount is 39 mm (1.5 in) over the course of 8 days.

September Precipitation Trends in Joondalup

The chart displays monthly precipitation patterns in Joondalup, 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 Joondalup, September typically receives around 39 mm (1.5 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec29582021541001111023939249
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Joondalup

In Joondalup in September humidity is 61%. With an average temperature of 15°C (60°F), this humidity feels like a mild embrace, creating a pleasant, almost refreshing atmosphere for traveling, though it may also encourage you to stay hydrated and take breaks during your explorations.

September Average Humidity in Joondalup

This chart illustrates the average monthly humidity levels in Joondalup, 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 Joondalup is approximately 61%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec40%44%50%65%69%75%74%71%61%51%45%40%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Joondalup

In Joondalup in September, the maximum UV index is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to the Hourly UV Index in Joondalup.

Maximum UV Index Levels in Joondalup for September

The chart shows the monthly maximum UV Index (UVI) for Joondalup 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 Joondalup typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec141412964468111314
Data source: Joondalup 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 Joondalup Compares to Other Months

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

This table compares monthly weather conditions in Joondalup, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather24°C (75°F)29 mm (1.2 inches)40%extreme
February Weather24°C (75°F)58 mm (2.3 inches)44%extreme
March Weather23°C (73°F)20 mm (0.8 inches)50%extreme
April Weather20°C (68°F)21 mm (0.8 inches)65%very high
May Weather17°C (63°F)54 mm (2.1 inches)69%high
June Weather15°C (59°F)100 mm (3.9 inches)75%moderate
July Weather14°C (58°F)111 mm (4.4 inches)74%moderate
August Weather14°C (58°F)102 mm (4.0 inches)70%high
September Weather15°C (60°F)39 mm (1.5 inches)61%very high
October Weather17°C (63°F)39 mm (1.5 inches)50%extreme
November Weather20°C (68°F)24 mm (0.9 inches)45%extreme
December Weather23°C (73°F)9 mm (0.3 inches)40%extreme

Compare Joondalup's Climate with Cities Worldwide