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September Weather in Jamestown, Australia

Last updated: August 22, 2025

In September, the average temperature in Jamestown, Australia is a comfortable 12°C (55°F), making it a pleasant time to explore. You'll experience a minimum of 0°C (32°F) and a maximum of 30°C (86°F), so be prepared for a range of temperatures. With average precipitation of 29 mm (1.2 in) over 6 days, and humidity levels around 57%, it's wise to pack an umbrella along with your sunblock! Enjoy the unique climate that Jamestown has to offer!

September Temperature in Jamestown

In September in Jamestown, the average temperature is 12°C (55°F). Maximum temperatures can reach 30°C (86°F), while the minimum can drop as low as 0°C (32°F). It's advisable to pack layers when traveling, as the weather can vary significantly throughout the day.

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

The chart illustrates September temperature patterns in Jamestown, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Jamestown, September typically has an average temperature of 12°C (55°F), with highs reaching up to 30°C (86°F) and lows dropping to around 0°C (32°F).
JanFebMarAprMayJunJulAugSepOctNovDec747169625348484854606570
Data source: Temperature data for Jamestown 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 Jamestown

In Jamestown in September, the total precipitation amount is 29 mm (1.2 in) over the course of 6 days.

September Precipitation Trends in Jamestown

The chart displays monthly precipitation patterns in Jamestown, 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 Jamestown, September typically receives around 29 mm (1.2 inches) of precipitation spread over approximately 6 days.
JanFebMarAprMayJunJulAugSepOctNovDec14228263134345129343922
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Jamestown

In Jamestown in September humidity is 57%. With an average temperature of 12°C (55°F), this humidity feels like a refreshing chill in the air, making it a great time for travelers to explore without feeling overly hot, though a light jacket is advisable to stay comfortable.

September Average Humidity in Jamestown

This chart illustrates the average monthly humidity levels in Jamestown, 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 Jamestown is approximately 57%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec30%35%50%60%69%71%72%64%57%40%40%37%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Jamestown

In Jamestown 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 Jamestown.

Maximum UV Index Levels in Jamestown for September

The chart shows the monthly maximum UV Index (UVI) for Jamestown 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 Jamestown typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec151412964468111316
Data source: Jamestown 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 Jamestown Compares to Other Months

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

This table compares monthly weather conditions in Jamestown, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather23°C (74°F)14 mm (0.5 inches)30%extreme
February Weather22°C (71°F)22 mm (0.9 inches)35%extreme
March Weather20°C (69°F)8 mm (0.3 inches)50%extreme
April Weather17°C (62°F)26 mm (1.0 inches)60%very high
May Weather12°C (53°F)31 mm (1.2 inches)69%high
June Weather9°C (48°F)34 mm (1.3 inches)71%moderate
July Weather9°C (49°F)34 mm (1.3 inches)72%moderate
August Weather9°C (49°F)51 mm (2.0 inches)64%high
September Weather12°C (55°F)29 mm (1.2 inches)57%very high
October Weather16°C (60°F)34 mm (1.3 inches)40%extreme
November Weather18°C (65°F)39 mm (1.5 inches)40%extreme
December Weather21°C (71°F)22 mm (0.9 inches)37%extreme

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