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September Weather in Saint Marys, Australia

Last updated: August 22, 2025

In September, the average temperature in Saint Marys, Australia is a mild 11°C (51°F), with daily lows dipping to 5°C (41°F) and reaching a pleasant high of 18°C (64°F). Be prepared for some rain, as 53 mm (2.1 in) of precipitation is expected over 9 days. Don't forget your umbrella, as the average humidity hovers around 77%, adding a touch of stickiness to the air!

September Temperature in Saint Marys

In September in Saint Marys, the average temperature is 11°C (51°F). The maximum can reach 18°C (64°F), while the minimum can drop as low as 5°C (41°F). Pack layers to stay comfortable during your travels!

September Weather in Saint Marys: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Saint Marys, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Saint Marys, September typically has an average temperature of 11°C (51°F), with highs reaching up to 18°C (64°F) and lows dropping to around 5°C (41°F).
JanFebMarAprMayJunJulAugSepOctNovDec636161585552505051535659
Data source: Temperature data for Saint Marys 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 Saint Marys

In Saint Marys in September, the total precipitation amount is 53 mm (2.1 in) spread over 9 days.

September Precipitation Trends in Saint Marys

The chart displays monthly precipitation patterns in Saint Marys, 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 Saint Marys, September typically receives around 53 mm (2.1 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec647786384459324753926295
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Saint Marys

In Saint Marys in September, humidity is 77%. With an average temperature of 11°C (51°F), this humidity feels like a damp chill, making traveling somewhat uncomfortable and requiring extra layers to stay warm while navigating the dampness in the air.

September Average Humidity in Saint Marys

This chart illustrates the average monthly humidity levels in Saint Marys, 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 Saint Marys is approximately 77%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec76%74%76%75%78%77%79%79%77%75%76%77%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Saint Marys

In Saint Marys in September, the maximum UV index is 6, which corresponds to a high Exposure Category. The time to burn is approximately 25 minutes. To find the hourly UV index in Saint Marys, you can refer to this Hourly UV Index in Saint Marys.

Maximum UV Index Levels in Saint Marys for September

The chart shows the monthly maximum UV Index (UVI) for Saint Marys 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 Saint Marys typically reaches 6, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec1311963224681013
Data source: Saint Marys 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 Saint Marys Compares to Other Months

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

This table compares monthly weather conditions in Saint Marys, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather17°C (63°F)64 mm (2.5 inches)76%extreme
February Weather16°C (62°F)77 mm (3.0 inches)74%extreme
March Weather16°C (61°F)86 mm (3.4 inches)76%very high
April Weather14°C (58°F)38 mm (1.5 inches)75%high
May Weather13°C (55°F)43 mm (1.7 inches)78%moderate
June Weather11°C (52°F)59 mm (2.3 inches)77%low
July Weather10°C (50°F)32 mm (1.3 inches)79%low
August Weather10°C (50°F)47 mm (1.8 inches)78%moderate
September Weather11°C (51°F)53 mm (2.1 inches)77%high
October Weather12°C (54°F)92 mm (3.6 inches)75%very high
November Weather13°C (56°F)62 mm (2.5 inches)76%very high
December Weather15°C (59°F)95 mm (3.7 inches)76%extreme

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