September Weather in Perth, Australia

Last updated: February 25, 2025

In September, Perth, Australia, welcomes the spring season with a delightful array of weather conditions. The maximum temperature often reaches a pleasant 28°C (83°F), while the average hovers around a comfortable 15°C (60°F), making it an ideal time for outdoor activities. However, nights can be cool with temperatures dipping to a minimum of 7°C (44°F). This month experiences approximately 42 mm (1.6 in) of rainfall over about 7 days, contributing to a relatively humid atmosphere with levels around 71%. Overall, September in Perth is characterized by a refreshing blend of warmth and mild weather, perfect for both locals and visitors alike.

September Temperature in Perth

As September approaches in Perth, Australia, the transition from winter to spring brings a refreshing change in temperatures. With minimums averaging around 7°C (44°F) and a comfortable average of 15°C (60°F), the city begins to warm up after the cooler months. The maximum temperature can reach up to 28°C (83°F), providing plenty of sunny days perfect for outdoor adventures. This month marks a gradual increase in warmth, as nature awakens from its winter slumber, setting the stage for an explosion of color and life in the coming months. Visitors and residents alike can enjoy a pleasant climate, making September an ideal time to explore what Perth has to offer.

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.
JanFebMarAprMayJunJulAugSepOctNovDec747573686259585760636773
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 September, Perth experiences a shift in its precipitation patterns, accumulating 42 mm (1.6 in) of rain over seven days. This marks a notable decrease compared to the wetter months preceding it, where July and August recorded hefty totals of 115 mm and 103 mm, respectively. As winter wanes and spring approaches, the city's rainfall begins to stabilize, indicating a transition. The dry spell of January is a distant memory, but September's moderate precipitation paves the way for drier months ahead, such as October, which has a similar amount of 41 mm. With the arrival of spring, Perth's weather presents a delicate balance of nourishing rain and the promise of clearer skies, setting the stage for the warmer months to follow.

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.
JanFebMarAprMayJunJulAugSepOctNovDec31582121581081151034241268
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 September, Perth experiences a noticeable dip in humidity as it transitions into spring, with levels averaging around 71%. This marks a slight decrease from the 75% humidity recorded in August, reflecting the end of winter's cooler, damp conditions. Throughout the year, Perth's humidity typically rises from the dry summer months, peaking at 77% during the colder winter season in June and July. Following this peak, September's humidity sets the stage for a gradual decline leading into October, when levels drop to 63%. Overall, September serves as a pivotal month, bridging the gap between the high humidity of winter and the more temperate conditions of the upcoming summer.

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, allowing you to see how September's humidity levels compare to other months.
JanFebMarAprMayJunJulAugSepOctNovDec53%55%59%70%72%77%77%75%71%63%56%53%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Perth

As September rolls into Perth, Australia, the UV Index registers at 8, falling into the very high exposure category with a burn time of just 15 minutes. This marks a notable increase from the cooler months of July and June, when the index hovered around 4. While September's UV levels may not reach the extremes of summer, they remain significant enough to warrant caution for outdoor activities. As the season transitions, it's essential to be mindful of UV exposure, especially with harsher levels on the horizon in October and November. Stay informed and protect your skin by checking the current UV index levels regularly at Perth UV Index.

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.
JanFebMarAprMayJunJulAugSepOctNovDec141411964468111314
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.

September Sunshine in Perth

As September unfolds in Perth, Australia, the city basks in a delightful 297 hours of sunshine, marking a gentle transition from the cooler winter months. This month bridges the gap between the moderate warmth of winter and the approaching summer's brilliance, with daylight hours gradually increasing compared to the 285 hours recorded in August. The gradual climb in sunshine hours from 279 in May reflects Perth's consistent move towards longer days and sunnier skies. With October on the horizon promising an impressive 329 hours of sunlight, September serves as a beautiful prelude, inviting residents and visitors alike to enjoy the outdoors and embrace the vibrant energy of spring.

Monthly Sunshine Duration in Perth: September Highlighted

The September sunshine duration represents the total number of hours Perth experiences direct sunlight during the month of September, excluding cloudy or obstructed periods. This chart compares the sunshine duration of September with the other months of the year.
JanFebMarAprMayJunJulAugSepOctNovDec308h315h323h289h279h261h273h285h297h329h352h384h
Data source: Perth September Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Perth During September

In September, Perth experiences a delightful 67% chance of sunny weather as it transitions from winter to spring. This marks a significant uptick from the cooler months of July and August, where sun prevalence dips to 39% and 56%, respectively. The likelihood of clear skies begins to rise again after a mid-year low, hinting at the approach of warmer days ahead. Comparatively, September's chances of sunshine exceed those in both October and May, highlighting it as an ideal time to enjoy outdoor activities before the hotter months set in. As the city shakes off the winter chill, the sun starts to assert itself, promising more blue skies and bright days.

Percentage of Sunny Days in September in Perth

The chart illustrates the percentage of sunny days in Perth throughout the year, with September highlighted. It highlights the variation in sunshine across each month and provides an overview of the typical frequency of sunny days, offering insights into how often Perth experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec73%71%61%54%45%54%39%56%67%49%66%79%
Data source: Perth September chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Perth in September

As September rolls into Perth, Australia, residents experience a refreshing change in daylight duration, easing out of the shorter days of winter. With about 11 hours of daylight, September marks the transition back towards longer days, rekindling the vibrant outdoor lifestyle that the city's residents enjoy. Following the depth of winter where daylight hovered at a consistent 10 hours for several months, the return of slightly longer days can invigorate both the spirit and social activities. As the month progresses, the promise of longer daylight hours continues to build, setting the stage for the warmth of summer that follows in November and December. Perth's daylight journey is a true reflection of seasonal shifts, inviting locals and visitors alike to savor the beauty of the region as nature begins to awaken once again.

Average Daylight Hours in Perth for September

The chart illustrates the variation in daylight duration in Perth throughout the year, with September highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec13h 57m13h 12m12h 14m11h 16m10h 28m10h 4m10h 16m10h 58m11h 53m12h 52m13h 44m14h 11m
Data source: Perth daylight hours, calculated by summing the hours between sunrise and sunset for each day.

September Winds in Perth

As September arrives in Perth, the winds begin to shift subtly from the briskness of winter. With an average wind speed of 4.7 m/s (10 mph), this month sees a gentle breeze that is reminiscent of the transition towards warmer days. Following a pattern from mid-year, where the wind peaked in July at 6.2 m/s (14 mph), September's winds signify a gradual easing, resembling the calm before the summer's heat. This slight decrease from August's average of 4.9 m/s (11 mph) hints at the changing season, making the early spring atmosphere fresh yet gentle, perfect for outdoor activities. As the year progresses toward October, expect the winds to pick up slightly again, foreshadowing the dynamic shifts that are characteristic of the Australian climate.

Average September Wind Speed in Perth

The chart displays monthly wind speed patterns in Perth, with values for each month shown alongside September's data, which is highlighted for easy comparison. It illustrates the average wind speed, offering insights into how September's wind conditions compare to the rest of the year.
JanFebMarAprMayJunJulAugSepOctNovDec6.25.84.74.24.44.46.24.94.7 m/s5.05.35.9
Data source: Perth September wind data, generated using information from the Copernicus Climate Change Service.

How September Weather in Perth Compares to Other Months

The weather in Perth changes throughout the year, offering a unique experience in each season. Below is a month-by-month comparison of September's weather with other months, highlighting differences in temperature, precipitation, and other key factors. Click on each section to discover seasonal trends in Perth and find detailed weather information for every month.

September and January present notably different weather patterns. In September, temperatures range from a cool minimum of 7°C (44°F) to a maximum of 28°C (83°F), with an average of 15°C (60°F). The month experiences approximately 42 mm (1.6 in) of rainfall over 7 days, accompanied by higher humidity levels of 71%. In contrast, January boasts warmer temperatures, with a minimum of 13°C (56°F), an average of 24°C (75°F), and a sweltering maximum of 37°C (99°F). Precipitation is minimal in January, totaling only 31 mm (1.2 in) and falling over no rainy days, while humidity drops to 52%. For more detailed insights, check Perth weather in January.

In September, the weather is notably milder with temperatures ranging from a minimum of 7°C (44°F) to a maximum of 28°C (83°F) and an average of 15°C (60°F). This month experiences around 42 mm (1.6 in) of precipitation over roughly 7 days, contributing to a higher humidity level of 71%. In contrast, February presents significantly warmer conditions, with temperatures ranging from a minimum of 14°C (57°F) to a scorching maximum of 38°C (101°F), averaging 24°C (75°F). While February sees a bit more rainfall at 58 mm (2.3 in) over just 4 days, it boasts lower humidity at 55%. For more detailed insights, check out Perth weather in February.

In September, the weather is generally cooler, with temperatures ranging from a minimum of 7°C (44°F) to a maximum of 28°C (83°F) and an average of 15°C (60°F). The month experiences more precipitation, totaling 42 mm (1.6 in) over about 7 days, accompanied by a higher humidity level of 71%. In contrast, March brings warmer conditions, with temperatures ranging from a minimum of 11°C (53°F) to a maximum of 35°C (96°F) and an average of 23°C (73°F). March is also drier, with only 21 mm (0.8 in) of precipitation over 4 days and lower humidity at 59%. For more information, you can check Perth weather in March.

September and April present contrasting weather patterns, reflecting the transition from late winter to early spring and early autumn, respectively. In September, temperatures range from a minimum of 7°C (44°F) to a maximum of 28°C (83°F), with an average of 15°C (60°F), while April enjoys milder temperatures, with a minimum of 9°C (49°F), an average of 20°C (68°F), and a maximum of a surprising 34°C (94°F). Precipitation in September is higher at 42 mm (1.6 in) over 7 days compared to April's 21 mm (0.8 in) across just 3 days, making September feel more humid at 71%, while April maintains a comfortable 70% humidity level. For those interested in detailed weather conditions, you can explore Perth weather in April.

In September, the weather tends to be slightly cooler than in May, with average temperatures ranging from a minimum of 7°C (44°F) to a maximum of 28°C (83°F), making the overall average around 15°C (60°F). In contrast, May experiences a slightly warmer average temperature of 17°C (62°F), with highs reaching up to 29°C (84°F). Both months see a similar level of humidity, hovering around 71% in September and 72% in May. However, May experiences more precipitation, totaling 58 mm (2.3 in) over about 8 days, compared to September's 42 mm (1.6 in) over 7 days. For a deeper dive into May's weather specifics, check out Perth weather in May.

In comparing the weather between September and June, it is evident that both months experience mild temperatures, with September offering a slightly broader range. September sees minimum temperatures around 7°C and maximums reaching up to 28°C, with an average of 15°C. In contrast, June has slightly higher minimum temperatures of 8°C but lower maximums at 24°C, maintaining a similar average of 15°C. Precipitation is noticeably higher in June, with 107 mm over 11 days compared to September's 42 mm across just 7 days, indicating a wetter month. Humidity levels are also slightly elevated in June at 77% compared to September's 71%. For a detailed view, you can check out Perth weather in June.

In comparing the weather of September and July, September generally offers slightly warmer maximum temperatures, reaching up to 28°C (83°F), while July peaks at a cooler 23°C (73°F). Both months have similar average temperatures, around 15°C (60°F), but September experiences less precipitation, with only 42 mm (1.6 in) over 7 days, compared to July's 115 mm (4.5 in) over 16 days. Additionally, September's humidity is slightly lower at 71%, versus July's 77%, making it a more comfortable month overall. For a more detailed look at July’s weather specifics, visit Perth weather in July.

In comparing the weather of September and August, it's notable that September experiences slightly warmer average temperatures, ranging from a minimum of 7°C (44°F) to a maximum of 28°C (83°F), compared to August's min 7°C (45°F) at an average of 14°C (58°F) and a max of 26°C (78°F). September also sees less precipitation, with 42 mm (1.6 in) over 7 days, in contrast to August's 103 mm (4.1 in) over 11 days, indicating a drier month. Humidity levels are similar, with September at 71% and August at 75%. For a more detailed look at August's climate, you can check this link: Perth weather in August.

September and October both showcase a gradual shift in weather patterns. In September, temperatures range from a minimum of 7°C (44°F) to a maximum of 28°C (83°F), with an average of 15°C (60°F) and a noticeable humidity level of 71%. The precipitation for the month totals 42 mm (1.6 in) over about 7 days. In contrast, October experiences slightly warmer temperatures, with a minimum of 9°C (48°F), an average of 17°C (63°F), and a maximum of 32°C (90°F). The overall humidity decreases to 63%, while precipitation remains similar at 41 mm (1.6 in) over the same number of days. For more detailed insights, you can explore Perth weather in October.

September's weather features a more significant temperature range, with minimums dipping to 7°C (44°F) and maximums reaching 28°C (83°F), while November displays a warmer average with minimum temperatures of 10°C (50°F) and highs soaring to 35°C (96°F). The month of September experiences around 42 mm (1.6 in) of precipitation over 7 days, contributing to higher humidity levels of 71%. In contrast, November is significantly drier, with only 26 mm (1.0 in) of rain falling over just 3 days and a lower humidity of 56%. For a detailed look at what to expect, check out Perth weather in November.

In September, the weather features a wider range of temperatures, with a minimum of 7°C (44°F) and a maximum of 28°C (83°F), accompanied by average humidity levels of 71%. This month sees about 42 mm (1.6 in) of precipitation over approximately 7 days, indicating a relatively damp climate. In contrast, December offers considerably warmer temperatures, with a minimum of 10°C (51°F) and a staggering maximum of 40°C (104°F), along with significantly lower humidity at 53%. Precipitation drops dramatically to just 8 mm (0.3 in) over only 2 days, highlighting a much drier atmosphere. For a closer look at December weather specifics, you can check out Perth weather in December.

Compare Perth's Climate with Cities Worldwide

Conclusion: What to Expect From September Weather in Perth

As the fresh air of spring settles in, September in Perth brings a delightful change from the winter chill. With pleasant temperatures hovering around a mild 15°C (60°F), visitors can enjoy an invigorating mix of sunny days and refreshing breezes. While the occasional rain may shower the city, with around 7 days of light precipitation, it beautifully complements the lush greenery that flourishes during this time. The increased humidity levels at 71% offer a subtle reminder of the warmer months ahead, making it a perfect transitional period. For those seeking more insights on how Perth's weather evolves throughout the year, check out Perth Climate.