September Weather in Perth, Australia

Last updated: February 25, 2025

September in Perth, Australia ushers in the arrival of spring, showcasing a mild climate with maximum temperatures reaching 21°C (69°F) and a refreshing average of 8°C (47°F). The month experiences a brisk minimum temperature dipping to -3°C (26°F), providing a pleasant contrast to the warmer days. Rainfall is moderate, with 68 mm (2.7 in) spread over 11 days, contributing to the lush landscapes that characterize the season. With humidity levels hovering around 80%, September offers a unique blend of fresh, invigorating air, making it an ideal time for outdoor activities and exploration in this vibrant coastal city.

September Temperature in Perth

In September, Perth’s temperatures begin to show signs of spring, with the minimum dipping to a chilly -3°C (26°F), but quickly rising throughout the month to a mild maximum of 21°C (69°F). The average temperature hovers around 8°C (47°F), marking a noticeable shift from the cold winter months preceding it. As the days grow longer and warmer, the city gradually transitions from the crispness of August, bringing a welcome relief from the colder averages of the previous months. This month serves as a bridge, paving the way for more comfortable and vibrant temperatures in the upcoming October.

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.
JanFebMarAprMayJunJulAugSepOctNovDec636159534844434447525659
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 notable change in its climate as it transitions from the chill of winter to the warmth of spring. With an average precipitation of 68 mm (2.7 in) across 11 days, the city's rainfall remains consistent when compared to the previous month and mirrors the steady levels observed in March. This trend highlights a gradual increase in precipitation as Perth prepares for the upcoming hotter months. The weather patterns suggest a lush awakening of nature, as the spring rains support the growth of vibrant flora, setting a picturesque scene for residents and visitors alike. Overall, September balances rainfall with the anticipation of sunnier days ahead, painting a dynamic picture of Perth's seasonal transformation.

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.
JanFebMarAprMayJunJulAugSepOctNovDec506868587755897068855671
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 relatively high humidity level of 80%, marking a continuation of the trend seen in the cooler months. Following the peak humidity levels of 84% in July and August, September’s figures indicate a slight decrease as the city transitions into spring. This seasonal shift reveals a gradual decline from the winter months, though humidity remains noticeably elevated compared to the earlier summer months, such as January and February, where values were closer to 69% and 68% respectively. The persistent humidity this month serves as a reminder of the region's unique climate, bridging the gap between winter's chill and the warmer air that the upcoming months promise.

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.
JanFebMarAprMayJunJulAugSepOctNovDec69%68%73%77%83%83%84%83%80%76%76%71%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Perth

In September, Perth experiences a UV Index of 6, placing it in the high exposure category, with a burn time of just 25 minutes. This marks a transition from the cooler, lower exposure months of winter, as UV levels begin to rise again following a low of 2 during June and July. Compared to August's moderate index of 4, September heralds the return of more intense sun, making it essential for residents and visitors alike to take sun safety precautions. As we move towards summer, it’s crucial to stay informed and protected under the increasing UV index levels in Perth. For more detailed insights, check out the 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.
JanFebMarAprMayJunJulAugSepOctNovDec13111063224681113
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 rolls into Perth, Australia, residents are graced with 260 hours of sunshine, marking a delightful transition from the cooler winter months. This increase in daylight hours reflects a gradual brightening trend as the city shakes off the chill of winter, with sunshine levels steadily climbing from the 191 hours recorded in June. Compared to the preceding months, September's sun brings a welcome warmth, reminiscent of early spring, and sets the stage for even sunnier days ahead, as October promises 299 hours of radiant light. This gentle resurgence of sunlight not only uplifts spirits but also signals the onset of outdoor activities, inviting both locals and visitors alike to bask in Perth's vibrant atmosphere.

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.
JanFebMarAprMayJunJulAugSepOctNovDec297h296h286h249h217h191h210h235h260h299h319h354h
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, Australia enjoys a 43% chance of sunny weather, making it one of the more favorable months for sunshine as the city transitions into spring. This percentage reflects a slight increase in sunny days compared to the winter months of June (19%) and July (31%), as well as August (32%), signaling the end of the colder season. While it doesn't quite reach the levels seen in the peak summer months, September's sunshine potential is certainly an invitation for outdoor activities and exploration. As October approaches, the chance of sun dips slightly to 30%, suggesting that September is an ideal time to bask in the emerging warmth before the heat of summer fully arrives.

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.
JanFebMarAprMayJunJulAugSepOctNovDec38%44%40%50%44%19%32%32%43%30%37%49%
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 unfolds in Perth, Australia, the days begin to lengthen, stretching to 11 hours of daylight. This marks a gradual transition from the winter months of June, July, and August, when daylight was consistently at its shortest, averaging around 9 hours. With the arrival of spring, daylight duration steadily increases, a trend that will continue into the warmer months. By the end of October, the days will extend to 13 hours, paving the way for the sunny days of summer ahead. It's a time of renewal, as nature awakens and Perth's vibrant life blossoms under the ever-increasing sunlight.

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.
JanFebMarAprMayJunJulAugSepOctNovDec14h 46m13h 41m12h 19m10h 56m9h 46m9h 11m9h 29m10h 29m11h 48m13h 12m14h 27m15h 6m
Data source: Perth daylight hours, calculated by summing the hours between sunrise and sunset for each day.

September Winds in Perth

As September rolls in, Perth experiences a gentle but notable increase in wind speed, averaging 3.6 m/s (8 mph), just shy of the breezy heights of August. This upward trend reflects the transition into spring, with winds becoming more invigorating after the milder winter months. Compared to the preceding months, September's breezes signal a shift—greater than the 3.0 m/s of July and April but slightly less than August's peak. The consistent winds carry the promise of warmer days ahead, inviting residents and visitors alike to enjoy the vibrant atmosphere that characterizes Perth during this time of year. As summer approaches, the refreshing currents become a welcome companion for outdoor activities, underscoring the dynamic yet enjoyable climate of this Australian gem.

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.
JanFebMarAprMayJunJulAugSepOctNovDec2.92.82.63.02.82.83.03.73.6 m/s3.22.73.2
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 contrasting weather experiences. In September, temperatures range from a chilly minimum of -3°C (26°F) to a comfortable maximum of 21°C (69°F), with an average around 8°C (47°F). This month also sees higher precipitation, totaling 68 mm (2.7 in) across 11 days, contributing to a humidity level of 80%. In stark contrast, January brings milder temperatures, with minimums of 4°C (40°F) and maximums soaring up to 33°C (91°F), averaging 17°C (64°F). Additionally, January experiences less rainfall, totaling 50 mm (2.0 in) over just 5 days, along with a lower humidity of 69%. For more detailed information on January weather in Perth, refer to Perth weather in January.

September and February exhibit quite contrasting weather patterns. In September, temperatures range from a minimum of -3°C (26°F) to a maximum of 21°C (69°F), with an average temperature of 8°C (47°F). The month experiences 68 mm (2.7 in) of precipitation over 11 days, accompanied by high humidity levels at 80%. In contrast, February is considerably warmer, featuring temperatures that span from a minimum of 3°C (37°F) to a blistering 33°C (92°F), with an average of 16°C (61°F). Although February also sees a total of 68 mm (2.7 in) of precipitation, it falls over just 8 days, resulting in lower humidity at 68%. These differences highlight the transition from the cooler, wetter conditions of September to the warmer and drier environment of February. For more detailed information, visit Perth weather in February.

In September, temperatures in Perth range from a chilly -3°C (26°F) at night to a mild 21°C (69°F) during the day, with an average of 8°C (47°F). The month experiences a relatively high humidity of 80% and sees precipitation on 11 days, totaling 68 mm (2.7 in). In contrast, March boasts warmer temperatures, with lows of 1°C (35°F) and highs reaching a comfortable 31°C (88°F), averaging 15°C (59°F). This month has slightly less humidity at 72% and fewer rainy days, with precipitation also totaling 68 mm (2.7 in) over just 9 days. For more details on the weather specifics, you can check out Perth weather in March.

In September, weather conditions start to shift as the temperatures range from a minimum of -3°C (26°F) to a comfortable maximum of 21°C (69°F), averaging around 8°C (47°F). The month sees about 68 mm (2.7 in) of precipitation over 11 days, with humidity levels averaging 80%. In contrast, April offers slightly warmer temperatures, with a minimum of -2°C (29°F) and a maximum of 25°C (77°F), averaging 12°C (53°F). Precipitation in April is relatively lower at 58 mm (2.3 in) spread across 7 days, coupled with a slightly lower humidity of 77%. For a more detailed look at the weather in April, you can check Perth weather in April.

September and May both feature cool temperatures, but September generally experiences a wider range. In September, temperatures fluctuate from a chilly minimum of -3°C (26°F) to a pleasant maximum of 21°C (69°F), with an average of 8°C (47°F). In contrast, May has slightly warmer averages, with temperatures ranging from -2°C (30°F) at night to a maximum of 20°C (68°F), resulting in an average of 9°C (49°F).

Precipitation is also a defining characteristic of both months, with September receiving 68 mm (2.7 in) across 11 days of rain, while May sees a bit more rain, totaling 77 mm (3.0 in) over 9 days. Humidity levels are similar, with September at 80% and May slightly higher at 83%. For a more detailed look at weather patterns, you can check out Perth weather in May.

When comparing the weather in September and June, September tends to be slightly warmer with average temperatures reaching 8°C (47°F) and a maximum of 21°C (69°F), while June typically sees cooler temperatures with a maximum of only 15°C (60°F). Interestingly, September also experiences more rainfall, averaging 68 mm (2.7 in) over 11 days, compared to June's 55 mm (2.2 in) over 9 days. Humidity levels are quite similar, with September at 80% and June at 83%, indicating a generally damp climate in both months. For more detailed insights, you can visit Perth weather in June.

In comparing the weather of September and July, September tends to be milder with average temperatures around 8°C (47°F) and a maximum of 21°C (69°F), while July experiences cooler conditions, averaging 6°C (44°F) with a maximum of only 14°C (58°F). Interestingly, July has slightly lower humidity at 84% compared to September's 80%, but receives more precipitation, with a total of 89 mm (3.5 in) across 12 days. In contrast, September records 68 mm (2.7 in) of precipitation over 11 days. For a closer look at July's weather specifics, you can check Perth weather in July.

In comparing the weather of September and August, September generally experiences slightly warmer conditions, with an average temperature of 8°C (47°F) compared to August's 7°C (45°F). Both months have a minimum temperature of -3°C, but September boasts a higher maximum temperature of 21°C (69°F), significantly warmer than August's maximum of 15°C (60°F). Precipitation levels are relatively similar, with September receiving 68 mm (2.7 in) over 11 days, while August sees 70 mm (2.8 in) over 12 days. Humidity is slightly lower in September at 80%, compared to 83% in August. For more detailed insights, you can explore Perth weather in August.

September and October present a noticeable shift in weather patterns. In September, temperatures range from a chilly minimum of -3°C (26°F) to a maximum of 21°C (69°F), with an average of 8°C (47°F). This month sees about 68 mm (2.7 in) of precipitation over 11 days, accompanied by high humidity at 80%. In contrast, October brings slightly warmer conditions, with a minimum of -1°C (31°F) and a maximum of 25°C (78°F), leading to a higher average of 11°C (52°F). Precipitation increases to 85 mm (3.4 in) spread over 12 days, but humidity dips to 76%. For those interested in the specifics of October weather, you can check this link: Perth weather in October.

September and November showcase distinct weather characteristics. In September, temperatures range from a chilly minimum of -3°C (26°F) to a pleasant maximum of 21°C (69°F), with an average of 8°C (47°F). The month experiences a fair amount of precipitation, totaling 68 mm (2.7 in) over 11 days, accompanied by relatively high humidity at 80%. In contrast, November offers warmer temperatures with a minimum of 0°C (32°F) and a notable maximum of 28°C (83°F), averaging 13°C (56°F). This month sees less rainfall, with 56 mm (2.2 in) over 9 days, and humidity slightly lower at 76%. For a closer look at the weather during this month, you can refer to Perth weather in November.

In September, the weather in Perth is characterized by a cooler temperature range, with a minimum of -3°C (26°F) and an average of 8°C (47°F), reaching a maximum of 21°C (69°F). This month sees about 68 mm (2.7 in) of precipitation spread over 11 days, along with relatively high humidity at 80%. In contrast, December brings significantly warmer temperatures, with a minimum of 3°C (37°F) and an average of 15°C (60°F), peaking at 33°C (92°F). Although precipitation slightly increases to 71 mm (2.8 in), it occurs over fewer days (7 days) and the humidity drops to 71%. For a detailed look at the weather during this month, check out Perth weather in December.

Compare Perth's Climate with Cities Worldwide

Conclusion: What to Expect From September Weather in Perth

As Perth transitions into spring in September, the weather becomes a delightful mix of warmth and crispness, distinguishing it from the colder winter months. With an average temperature steadily rising, days grow pleasantly mild, though the nights can still feel quite cool. This month also sees a slight increase in precipitation, reminding us that spring can be unpredictable. The humidity level remains relatively high, adding to the season's vibrancy. For those looking to delve deeper into Perth's climate nuances, visit Perth Climate for a comprehensive overview.