Climate and monthly weather forecast
Perth, Australia

The central business district of Perth, Australia
The central business district of Perth, Australia

The climate of Perth

Perth, nestled on the southwest coast of Australia, adheres to a Csa Köppen climate classification. This classification translates into a Mediterranean climate with a hot summer. Throughout the year, the city witnesses weather that varies drastically, presenting distinct peaks and valleys in its climatic parameters.

Perth, akin to its Mediterranean classification, experiences warm to hot temperatures through most of the year with the highest monthly average temperature reaching 31.7°C (89.1°F) in February. The thermal trend then decreases gradually, and by July, the city endures the coldest month, with temperatures dropping to an average low of 7.7°C (45.9°F). Concurrently, the relative humidity also elevates from an average of 39% in January and February to a high of 57% in July.

Rainfall in Perth spirals from a mere 9mm (0.35") in February to a substantial 145mm (5.71") in July. The number of rainy days follows a similar trend, increasing from 2.1 days in February to 16.9 days in July. Conversely, sunbathing opportunities dwindle from a lengthy 14 daylight hours in January to just 10.1 hours in June. Correspondingly, the UV index fluctuates between 12 in January and December, dropping to 3 in June and July.

Perth's distinct climate patterns truly emphasize the nature of its Mediterranean hot summer classification with hot, dry summers contrasting with moderately wet and cool winters.

The best time to visit Perth

With its Mediterranean climate, Perth invites visitors particularly during late spring and early autumn. Coinciding with both optimal temperatures and moderate rainfall, this period offers ideal conditions for outdoor activities and events. November, for instance, averages highs of 26.6°C (79.9°F) and only 24mm (0.94") of rainfall, making it an apt month to relish the local landscapes without the disruption of heavy rainfalls or extreme heat.

The worst time to visit Perth

Perth's winter months, June to August, dawns the list as the least desirable time for a visit. July marks both the coldest and wettest month with temperatures plummeting to 7.7°C (45.9°F) and rainfall escalating to 145mm (5.71"). Also, with the shortest daylight duration clocked in June, at an average of just 10.1 hours, the opportunities for outdoor exploration are significantly limited during this period.

Spring weather in Perth

Allying the warmth from the departing summer and the mildness of the arriving winter, Spring in Perth is pleasantly modulated. The temperature ranges from 25.9°C (78.6°F) to 18.4°C (65.1°F) in September, resting at 22.3°C (72.1°F) to 10.5°C (50.9°F) in November, with relative humidity hovering around 50%. Although rainfall escalates from 37mm (1.46") in September to 90mm (3.54") in November, it is still palatable compared to the winter season.

Summer weather in Perth

Summers in Perth are characterized by high temperatures and low rainfall. December welcomes the onset of summer with highs averaging 29.1°C (84.4°F) which scales up to a sizzling 31.7°C (89.1°F) by February. The scant rainfall ranges from 10mm (0.39") in December to 9mm (0.35") in February, coinciding with a short rainy spell triggered by the fewest average rainy days, thereby providing ample opportunity to revel the sunshine.

Autumn weather in Perth

Autumn in Perth is a transitional period where temperatures begin to cool and rainfall starts to inch upward. From March to May, temperatures abate from 29.6°C (85.3°F) to 22.3°C (72.1°F) and rainfall swells from 21mm (0.83") to a significant 90mm (3.54"). On the bright side, the lengthening daylight hours offer extended periods for leisure and exploration.

Winter weather in Perth

Winters in Perth exhibit a mellower temperament with decreasing temperature and increasing rainfall. The coldest month, July, sees temperatures dipping down to 7.7°C (45.9°F). Along with the chill, rainfall is at its zenith peaking at 145mm (5.71"), accompanied by the most rainy days at an average of 16.9. Winter in Perth is far from gloomy, however, with average daylight hours subtly increasing as the season progresses.

Weather in January

January in Perth, Australia brings in the New Year with a blend of warm temperatures and modest humidity. Characterized by a summery weather, the month commences with the city's highest annual temperature, reaching a scorching high of 31.3°C (88.3°F). Weather in January »

Weather in February

Just as January handed the baton of heat, February holds steady, recording the highest temperature of the year, an intense 31.7°C (89.1°F). Perth's weather during the second month continues to embrace the summer spirit, as sunbathed days make way for starlit nights. Weather in February »

Weather in March

March in Perth is a transitional time as summer bids farewell, and autumn graces the city. A detectable dip in temperature takes place, lowering to 29.6°C (85.3°F), signaling the start of the cooler months. Standout features of March include a slight increase in rainfall coupled with more humid conditions as nature prepares for autumn. Weather in March »

Weather in April

Embracing the full swing of autumn, April in Perth encounters pronounced changes in its climatic patterns. A decrease in temperature from 25.9°C (78.6°F) to cooler thresholds becomes noticeable, offering a respite after the heated summer months. Weather in April »

Weather in May

May marks the further continuation of cooler weather in Perth, where autumn transitions into the early phase of winter. The rainfall during this month amplifies to a significant 90mm (3.54"), marking the onset of wetter conditions in the city. Weather in May »

Weather in June

June in Perth not only ushers in the winter season but also signifies the shift to shorter days and longer nights. With recorded average low temperatures dipping to 8.6°C (47.5°F), the winter cold makes its presence felt. Occasional overcast skies and chilly winds become common phenomena during this time. Weather in June »

Weather in July

July in Perth grows colder, becoming the epitome of winter in the city. With the lowest sea temperatures registered at 19°C (66.2°F), a chilly blanket covers Perth during this month. The city experiences its highest rainfall of the year, 145mm (5.71"), providing nourishment to the abundant greenery. Weather in July »

Weather in August

August in Perth provides a glimpse of departure from the colder months, acting as a curtain-closer for winter. It holds onto the winter's vestiges, while introducing early signs of spring. As August advances, rainfall decreases, acting as a herald to sunnier days. Weather in August »

Weather in September

September marks the arrival of spring in Perth, bringing pleasant weather and blooming flowers. Gradual warming up of temperatures indicates the city’s shift from cooler to warmer months. Initially, remnants of winter rainfall linger, but as the month advances, the rain subsides. Weather in September »

Weather in October

In Perth, October weather offers warmth and serenity, characteristic of spring. Warmer temperatures from 23.4°C (74.1°F) accompany the city residents as they enjoy golden sunlight during the day. October sees a sharp reduction in rainfall, paving the way for sunnier days and cooler nights. Weather in October »

Weather in November

November in Perth is a segue into the approaching summer, exemplifying the brilliance of the late spring. Temperatures climb higher, reaching up to 26.6°C (79.9°F), indicating the advent of the warmer season. The progressively longer days speak of the coming summer, marked by copious sunlight and sparse rains. Weather in November »

Weather in December

Closing the year, December in Perth is filled with the arrival of summer, bringing back familiar higher temperatures. To herald the summer, Perth experiences a significant rise in temperature, soaring to 29.1°C (84.4°F), alongside reduced rainfall of 10mm (0.39"). Weather in December »

Frequently asked questions

How many days does it rain in Perth?

In Perth, during the entire year, the rain falls for 108.4 days and collects up to 725mm (28.54") of precipitation.

What is the month with the most sunshine in Perth?

The months with the most sunshine are January and December, with an average of 11.5h of sunshine.

When is the highest UV index in Perth?

January and December, with an average maximum UV index of 12, are months with the highest UV index.

What are the warmest months in Perth?

February, noted for its average high-temperature of 31.7°C (89.1°F) and an average low-temperature of 18.4°C (65.1°F), is considered the warmest month.

What is the least humid month in Perth?

February is the least humid month in Perth, Australia, with an average relative humidity of 38%.

What is the driest month in Perth?

The month with the least rainfall is February, when the rain falls for 2.1 days and typically collects 9mm (0.35") of precipitation.

What month is the sea warmest in Perth?

March is the month with the warmest seawater in Perth, with an average sea temperature of 23.4°C (74.1°F).

What is the month with the shortest days in Perth?

With an average of 10h and 6min of daylight, June has the shortest days of the year in Perth, Australia.

What is the month with the least sunshine in Perth?

With an average of 5.9h of sunshine, June has the least sunshine of the year in Perth, Australia.

What are the months with the lowest UV index in Perth?

June and July, with an average maximum UV index of 3, are months with the lowest UV index.

What is the coldest time of year in Perth?

The coldest period in Perth, Australia, is July, when temperatures fluctuate between an average high of 18.4°C (65.1°F) and a low of 7.7°C (45.9°F).

What is the most humid month in Perth?

The most humid month in Perth, Australia, is July, with an average relative humidity of 57%.

What is the rainiest month in Perth?

July is the month with the most rainfall in Perth, Australia. Rain falls for 16.9 days and accumulates 145mm (5.71") of precipitation.

What are the months with the coldest sea water in Perth?

September and October, with an average sea temperature of 19°C (66.2°F), are months with the coldest seawater in Perth, Australia.

When are the longest days in Perth?

December has the longest days of the year in Perth, with an average of 14h and 12min of daylight.

Is there Daylight Saving Time (DST) in Perth?

Perth, Australia, does not utilize Daylight Saving Time (DST). AWST timezone is used over the entire year.

Average temperature
Perth, Australia

Average temperature - Perth, Australia

The warmest month (with the highest average high temperature) is February (31.7°C).
The month with the lowest average high temperature is July (18.4°C).

The month with the highest average low temperature is February (18.4°C).
The coldest month (with the lowest average low temperature) is July (7.7°C).


Average rainfall
Perth, Australia

Average rainfall - Perth, Australia

The wettest month (with the highest rainfall) is July (144.7mm).
The driest month (with the least rainfall) is February (8.8mm).


Average rainfall days
Perth, Australia

Average rainfall days - Perth, Australia

The month with the highest number of rainy days is July (16.9 days).
The month with the least rainy days is February (2.1 days).


Average sea temperature
Perth, Australia

Average sea temperature - Perth, Australia

The best month for swimming (with the highest average sea temperature) is March (23.4°C).
The coldest months (with the lowest average sea temperature) are September and October (19°C).


Average daylight / Average sunshine
Perth, Australia

Average daylight / Average sunshine - Perth, Australia

The month with the longest days is December (Average daylight: 14h and 12min).
The month with the shortest days is June (Average daylight: 10h and 6min).

The months with the most sunshine are January and December (Average sunshine: 11h and 30min).
The month with the least sunshine is June (Average sunshine: 5h and 54min).


Average UV index
Perth, Australia

Average UV index - Perth, Australia

The months with the highest UV index are January and December (UV index 12).
The months with the lowest UV index are June and July (UV index 3).


Perth, Australia

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