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September Weather in Swansea, Australia

Last updated: August 22, 2025

The average temperature in Swansea, Australia during September hovers around 9°C (49°F). Expect daily variations with a minimum of 0°C (32°F) and a maximum reaching up to 23°C (73°F). During this month, precipitation totals around 44 mm (1.7 in) over approximately 8 days, while the average humidity sits at a comfortable 77%.

September Temperature in Swansea

In September in Swansea, the average temperature is 9°C (49°F). Maximum temperatures can reach 23°C (73°F), while the minimum can drop as low as 0°C (32°F). This means travelers should prepare for a range of temperatures, including the possibility of chilly evenings.

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

The chart illustrates September temperature patterns in Swansea, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Swansea, September typically has an average temperature of 9°C (49°F), with highs reaching up to 23°C (73°F) and lows dropping to around 0°C (32°F).
JanFebMarAprMayJunJulAugSepOctNovDec636059545047454649535659
Data source: Temperature data for Swansea 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 Swansea

In Swansea in September, the total precipitation amount is 44 mm (1.7 in) over a duration of 8 days.

September Precipitation Trends in Swansea

The chart displays monthly precipitation patterns in Swansea, 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 Swansea, September typically receives around 44 mm (1.7 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec605966374554254844886772
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Swansea

In Swansea in September humidity is 77%. With an average temperature of 9°C (49°F), this humidity feels like a damp chill that seeps into your bones, making outdoor explorations feel colder and more uncomfortable than the thermometer suggests.

September Average Humidity in Swansea

This chart illustrates the average monthly humidity levels in Swansea, 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 Swansea is approximately 77%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec76%73%77%78%80%79%81%79%77%75%76%76%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Swansea

In Swansea 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 Swansea, you can refer to this Hourly UV Index in Swansea.

Maximum UV Index Levels in Swansea for September

The chart shows the monthly maximum UV Index (UVI) for Swansea 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 Swansea typically reaches 6, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec13111063224681013
Data source: Swansea 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 Swansea Compares to Other Months

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

This table compares monthly weather conditions in Swansea, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather17°C (63°F)60 mm (2.4 inches)76%extreme
February Weather16°C (60°F)59 mm (2.3 inches)73%extreme
March Weather15°C (60°F)66 mm (2.6 inches)77%very high
April Weather12°C (55°F)37 mm (1.5 inches)78%high
May Weather10°C (51°F)45 mm (1.8 inches)80%moderate
June Weather8°C (47°F)54 mm (2.1 inches)79%low
July Weather7°C (46°F)25 mm (1.0 inches)80%low
August Weather8°C (46°F)48 mm (1.9 inches)79%moderate
September Weather9°C (49°F)44 mm (1.7 inches)77%high
October Weather11°C (53°F)88 mm (3.4 inches)75%very high
November Weather14°C (57°F)67 mm (2.7 inches)76%very high
December Weather15°C (60°F)72 mm (2.8 inches)76%extreme

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