Climate - Perth (Australia)
Average weather, temperature, rainfall, sunshine hours
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Climate chart - Perth
In Perth, a city located in south-western Australia (in the state of Western Australia), at 32 degrees south latitude, the climate is mediterranean, with mild, rainy winters and hot, sunny summers. Being in the Southern Hemisphere, it has reversed seasons in comparison to Europe or North America.
The average temperature ranges from 13.5 °C (56 °F) in July to 25 °C (77 °F) in January and February. Here are the average temperatures.
Perth - Average temperatures (1991-2020) | Month | Min (°C) | Max (°C) | Mean (°C) | Min (°F) | Max (°F) | Mean (°F) |
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| January | 17.6 | 32.3 | 25 | 64 | 90 | 76.9 |
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| February | 17.8 | 32.4 | 25.1 | 64 | 90 | 77.2 |
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| March | 16.3 | 30.1 | 23.2 | 61 | 86 | 73.8 |
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| April | 13.5 | 26.4 | 20 | 56 | 80 | 67.9 |
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| May | 10.6 | 22.4 | 16.5 | 51 | 72 | 61.7 |
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| June | 9 | 19.5 | 14.2 | 48 | 67 | 57.6 |
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| July | 8.2 | 18.5 | 13.4 | 47 | 65 | 56 |
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| August | 8.3 | 19.1 | 13.7 | 47 | 66 | 56.7 |
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| September | 9.1 | 20.6 | 14.8 | 48 | 69 | 58.7 |
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| October | 10.8 | 23.7 | 17.2 | 51 | 75 | 63 |
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| November | 13.4 | 27 | 20.2 | 56 | 81 | 68.4 |
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| December | 15.7 | 30.2 | 23 | 60 | 86 | 73.3 |
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| Year | 12.5 | 25.1 | 18.8 | 54.5 | 77.3 | 66 |
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Rainfall amounts to about 700 millimeters (27.5 inches) per year, the bulk of which occurring in the cold season, from May to September. Here is the average precipitation.
Perth - Average precipitation| Month | Millimeters | Inches | Days |
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| January | 15 | 0.6 | 1 |
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| February | 15 | 0.6 | 1 |
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| March | 20 | 0.8 | 2 |
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| April | 30 | 1.2 | 4 |
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| May | 80 | 3.1 | 9 |
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| June | 125 | 4.9 | 12 |
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| July | 140 | 5.5 | 14 |
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| August | 120 | 4.7 | 13 |
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| September | 80 | 3.1 | 11 |
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| October | 35 | 1.4 | 5 |
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| November | 30 | 1.2 | 4 |
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| December | 10 | 0.4 | 2 |
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| Year | 700 | 27.6 | 79 |
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Winter, from June to August, is mild, although the rains are frequent and abundant, since in this season, the flow of western disturbances moves to the north and reaches Southern Australia. However, with climate change, the flow is moving further south, so winter has become less rainy than in the past.
With the warm wind from the north, the temperature can exceed 20 °C (68 °F) even in winter.
At other times, a bit of cold air of Antarctic origin can arrive here, lowering the night temperature almost to freezing (0 °C or 32 °F). Outside the town, at some distance from the sea, even slight frosts may occur; in addition, houses generally do not have heating and are poorly insulated, so the feeling of cold is greater than one might expect. During the day, however, the temperature remains fairly mild also in these cases. The coldest record is -1.3 °C (29.7 °F) and was set in June 2006.
Spring goes from September to November; it is usually mild and a bit unstable in September and October, with some chance of rain and wind, but over the weeks, the rains gradually become rarer, so much so that November is already a pleasant month, and with scarce rainfall.
Summer, from December to March, is hot and sunny, with quite cool nights. The rains are rare, although some thunderstorms may occasionally occur. The wind is frequent: it regularly blows from the ocean, as an intense afternoon breeze, called "Fremantle Doctor", so much so that many people prefer to go to the beach in the morning, when the wind is weak and the sea is calm. Fremantle is a coastal town, where the maximum temperature in summer does not exceed 30 °C (86 °F).
This wind carries away the heat and makes the temperature generally acceptable, so it is welcomed despite its strength; as a matter of fact, when it doesn't blow, it is replaced, fortunately for short periods, by the hot and dry wind from the north-east, which comes from the desert: in these cases, the heat can become really intense, with highs above 40 °C (104 °F). This can occasionally happen also in November, while in October and April, the temperature with this wind can reach 35/37 °C (95/99 °F). The highest record is 46.7 °C (116.1 °F) and was set in February 1991.
In autumn, in April and May, temperatures are pleasant. In May, however, the rains become quite abundant, and sometimes, especially in the second half of the month, it can get quite cold.
The amount of sunshine in Perth is very good in spring and summer, from October to March, when clear skies prevail, while it is decent in winter, since periods of bad weather alternate with sunny periods. On average there are more than 3,200 hours of sunshine per year. Here are the average sunshine hours per day.
Perth - Sunshine hours| Month | Average | Total |
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January | 11.5 | 355 | February | 11.5 | 320 | March | 9.5 | 300 | April | 8.5 | 250 | May | 6.5 | 205 | June | 6 | 175 | July | 6 | 190 | August | 7 | 225 | September | 7.5 | 230 | October | 9.5 | 300 | November | 10.5 | 320 | December | 11.5 | 355 | Year | 8.8 | 3225 |
The ocean temperature is never warm for swimming, even though it becomes acceptable from January to May, when it reaches 22/23 °C (72/73 °F). In summer, on sunny days, the afternoon breeze can be so intense as to make the sea rough, especially in December and January. Here are the average sea temperatures.
Perth - Sea temperature| Month | Celsius (°C) | Fahrenheit (°F) |
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January | 21.5 | 71 | February | 22.5 | 72 | March | 22.5 | 73 | April | 22.5 | 72 | May | 22 | 72 | June | 21 | 70 | July | 20 | 68 | August | 19.5 | 67 | September | 19 | 66 | October | 19 | 67 | November | 20 | 68 | December | 21 | 69 | Year | 20.9 | 69.6 |
Best Time
The best times to visit Perth are spring and autumn, in particular, in April-May and September-October, since in this way you can avoid both the winter rains and the waves of scorching heat that can occur in summer. It must be said that May and September are quite rainy, and sometimes it can get cold at night.
If it were not for heat waves, which do not necessarily occur in a given period but are still a risk, you could very well enjoy the summer weather, which is generally not too hot, and sunny.
Perth - Weather by month
Based on the period 1991-2020
In January, the weather in Perth is usually warm to hot. However, there are remarkable differences between night and day. The average temperature is of 25.0 °C (77 °F), with a minimum of 17.6 °C (63.7 °F) and a maximum of 32.3 °C (90.1 °F).
On the coldest nights of the month, the temperature usually drops to around 10.5 °C (51 °F). However, it dropped to 6 °C (42.8 °F) in January 2001.
On the warmest days of the month, the temperature usually reaches around 41 °C (106 °F). However, it reached 46 °C (114.8 °F) in January 1991.
Precipitation amounts to 15 mm (0.6 in), and all occurs in one day.
The day lasts on average 14 hours and 0 minutes.
There are on average 11.5 hours of sunshine per day. So, the sun shines 82% of the time.
The average humidity is 47%.
The average wind speed is 20 kph (12 mph).
The average sea temperature is of 21.5 °C (71 °F). Therefore, the sea is cool for swimming.
In February, the hottest month of the year, the weather in Perth is usually warm to hot. However, there are remarkable differences between night and day. The average temperature is of 25.1 °C (77 °F), with a minimum of 17.8 °C (64 °F) and a maximum of 32.4 °C (90.3 °F).
On the coldest nights of the month, the temperature usually drops to around 11.5 °C (52.5 °F). However, it dropped to 7.1 °C (44.8 °F) in February 2016.
On the warmest days of the month, the temperature usually reaches around 40.5 °C (105.5 °F). However, it reached 46.7 °C (116.1 °F) in February 1991.
Precipitation amounts to 15 mm (0.6 in), and all occurs in one day.
The day lasts on average 13 hours and 10 minutes.
There are on average 11.5 hours of sunshine per day. So, the sun shines 87% of the time.
The average humidity is 48%.
The average wind speed is 19 kph (12 mph).
The average sea temperature is of 22.5 °C (72.5 °F). Therefore, the sea can be considered barely acceptable for swimming.
In March, the weather in Perth is usually warm to hot. However, there are remarkable differences between night and day. The average temperature is of 23.2 °C (74 °F), with a minimum of 16.3 °C (61.3 °F) and a maximum of 30.1 °C (86.2 °F).
On the coldest nights, the temperature usually drops to around 8.5 °C (47.5 °F). However, it dropped to 3 °C (37.4 °F) in March 2007.
On the warmest days, the temperature usually reaches around 39 °C (102 °F). However, it reached 43.8 °C (110.8 °F) in March 2003.
Precipitation amounts to 20 mm (0.8 in), distributed over 2 days.
The day lasts on average 12 hours and 10 minutes.
There are on average 9.5 hours of sunshine per day. So, the sun shines 79% of the time.
The average humidity is 51%.
The average wind speed is 18 kph (11 mph).
The average sea temperature is of 22.5 °C (73 °F). Therefore, the sea can be considered barely acceptable for swimming.
In April, the weather in Perth is usually warm. The average temperature is of 20.0 °C (68 °F), with a minimum of 13.5 °C (56.3 °F) and a maximum of 26.4 °C (79.5 °F).
On the coldest nights, which normally occur at the end of the month, the temperature usually drops to around 6.5 °C (44 °F). However, it dropped to 3.3 °C (37.9 °F) in April 2006.
On the warmest days, which normally occur at the beginning of the month, the temperature usually reaches around 34 °C (93.5 °F). However, it reached 39.6 °C (103.3 °F) in April 2020.
Precipitation amounts to 30 mm (1.2 in), distributed over 4 days.
The day lasts on average 11 hours and 20 minutes.
There are on average 8.5 hours of sunshine per day. So, the sun shines 73% of the time.
The average humidity is 59%.
The average wind speed is 14 kph (9 mph).
The average sea temperature is of 22.5 °C (72.5 °F). Therefore, the sea can be considered barely acceptable for swimming.
In May, the weather in Perth is usually very mild. The average temperature is of 16.5 °C (62 °F), with a minimum of 10.6 °C (51.1 °F) and a maximum of 22.4 °C (72.3 °F).
On the coldest nights, which normally occur at the end of the month, the temperature usually drops to around 4.5 °C (39.5 °F). However, it dropped to 1 °C (33.8 °F) in May 2010.
On the warmest days, which normally occur at the beginning of the month, the temperature usually reaches around 29 °C (84.5 °F). However, it reached 35.3 °C (95.5 °F) in May 2002.
Precipitation amounts to 80 mm (3.1 in), distributed over 9 days.
The day lasts on average 10 hours and 30 minutes.
There are on average 6.5 hours of sunshine per day. So, the sun shines 64% of the time.
The average humidity is 66%.
The average wind speed is 13 kph (8 mph).
The average sea temperature is of 22 °C (71.5 °F). Therefore, the sea is cool for swimming.
In June, the weather in Perth is usually mild. The average temperature is of 14.2 °C (58 °F), with a minimum of 9 °C (48.2 °F) and a maximum of 19.5 °C (67.1 °F).
On the coldest nights, the temperature usually drops to around 3 °C (37 °F). However, it dropped to -1.3 °C (29.7 °F) in June 2006.
On the warmest days, the temperature usually reaches around 24 °C (75 °F). However, it reached 26.1 °C (79 °F) in June 2000.
Precipitation amounts to 125 mm (4.9 in), distributed over 12 days.
The day lasts on average 10 hours and 5 minutes. June 21, the winter solstice, is the shortest day of the year in the Southern Hemisphere.
There are on average 6 hours of sunshine per day. So, the sun shines 59% of the time.
The average humidity is 72%. Hence, the air is normally humid.
The average wind speed is 14 kph (8 mph).
The average sea temperature is of 21 °C (70 °F). Therefore, the sea is cool for swimming.
In July, the coldest month of the year, the weather in Perth is usually mild. The average temperature is of 13.4 °C (56 °F), with a minimum of 8.2 °C (46.8 °F) and a maximum of 18.5 °C (65.3 °F).
On the coldest nights of the month, the temperature usually drops to around 2 °C (35.5 °F). However, it dropped to -1 °C (30.2 °F) in July 2006.
On the warmest days of the month, the temperature usually reaches around 23 °C (73.5 °F). However, it reached 25.7 °C (78.3 °F) in July 1994.
Precipitation amounts to 140 mm (5.5 in), distributed over 14 days.
The day lasts on average 10 hours and 20 minutes.
There are on average 6 hours of sunshine per day. So, the sun shines 59% of the time.
The average humidity is 74%. Hence, the air is normally humid.
The average wind speed is 13 kph (8 mph).
The average sea temperature is of 20 °C (68 °F). Therefore, the sea is very cool for swimming.
In August, the weather in Perth is usually mild. The average temperature is of 13.7 °C (57 °F), with a minimum of 8.3 °C (46.9 °F) and a maximum of 19.1 °C (66.4 °F).
On the coldest nights of the month, the temperature usually drops to around 2 °C (36 °F). However, it dropped to 0.1 °C (32.2 °F) in August 2004.
On the warmest days of the month, the temperature usually reaches around 24.5 °C (76.5 °F). However, it reached 30 °C (86 °F) in August 2019.
Precipitation amounts to 120 mm (4.7 in), distributed over 13 days.
The day lasts on average 11 hours and 0 minutes.
There are on average 7 hours of sunshine per day. So, the sun shines 65% of the time.
The average humidity is 71%. Hence, the air is normally humid.
The average wind speed is 14 kph (9 mph).
The average sea temperature is of 19.5 °C (66.5 °F). Therefore, the sea is very cool for swimming.
In September, the weather in Perth is usually very mild. The average temperature is of 14.8 °C (59 °F), with a minimum of 9.1 °C (48.4 °F) and a maximum of 20.6 °C (69.1 °F).
On the coldest nights, which normally occur at the beginning of the month, the temperature usually drops to around 3 °C (37.5 °F). However, it dropped to 0.4 °C (32.7 °F) in September 2008.
On the warmest days, which normally occur at the end of the month, the temperature usually reaches around 27.5 °C (81.5 °F). However, it reached 34.5 °C (94.1 °F) in September 2014.
Precipitation amounts to 80 mm (3.1 in), distributed over 11 days.
The day lasts on average 11 hours and 55 minutes.
There are on average 7.5 hours of sunshine per day. So, the sun shines 65% of the time.
The average humidity is 68%.
The average wind speed is 15 kph (9 mph).
The average sea temperature is of 19 °C (66.5 °F). Therefore, the sea is very cool for swimming.
In October, the weather in Perth is usually very mild. The average temperature is of 17.2 °C (63 °F), with a minimum of 10.8 °C (51.4 °F) and a maximum of 23.7 °C (74.7 °F).
On the coldest nights, which normally occur at the beginning of the month, the temperature usually drops to around 4.5 °C (40 °F). However, it dropped to 1.2 °C (34.2 °F) in October 2005.
On the warmest days, which normally occur at the end of the month, the temperature usually reaches around 33 °C (91.5 °F). However, it reached 37.3 °C (99.1 °F) in October 2019.
Precipitation amounts to 35 mm (1.4 in), distributed over 5 days.
The day lasts on average 12 hours and 55 minutes.
There are on average 9.5 hours of sunshine per day. So, the sun shines 74% of the time.
The average humidity is 60%.
The average wind speed is 17 kph (10 mph).
The average sea temperature is of 19 °C (66.5 °F). Therefore, the sea is very cool for swimming.
In November, the weather in Perth is usually warm. However, there are remarkable differences between night and day. The average temperature is of 20.2 °C (68 °F), with a minimum of 13.4 °C (56.1 °F) and a maximum of 27 °C (80.6 °F).
On the coldest nights, which normally occur at the beginning of the month, the temperature usually drops to around 7 °C (45 °F). However, it dropped to 3.2 °C (37.8 °F) in November 2004.
On the warmest days, which normally occur at the end of the month, the temperature usually reaches around 37.5 °C (99 °F). However, it reached 41.1 °C (106 °F) in November 2019.
Precipitation amounts to 30 mm (1.2 in), distributed over 4 days.
The day lasts on average 13 hours and 50 minutes.
There are on average 10.5 hours of sunshine per day. So, the sun shines 77% of the time.
The average humidity is 54%.
The average wind speed is 19 kph (12 mph).
The average sea temperature is of 20 °C (67.5 °F). Therefore, the sea is very cool for swimming.
In December, the weather in Perth is usually warm to hot. However, there are remarkable differences between night and day. The average temperature is of 23.0 °C (73 °F), with a minimum of 15.7 °C (60.3 °F) and a maximum of 30.2 °C (86.4 °F).
On the coldest nights of the month, the temperature usually drops to around 8.5 °C (47.5 °F). However, it dropped to 4.8 °C (40.6 °F) in December 2002.
On the warmest days of the month, the temperature usually reaches around 40.5 °C (104.5 °F). However, it reached 44.5 °C (112.1 °F) in December 2007.
Precipitation amounts to 10 mm (0.4 in), distributed over 2 days.
The day lasts on average 14 hours and 10 minutes. So the days are long. December 21, the summer solstice, is the longest day of the year in the Southern Hemisphere.
There are on average 11.5 hours of sunshine per day. So, the sun shines 81% of the time.
The average humidity is 48%.
The average wind speed is 20 kph (12 mph).
The average sea temperature is of 21 °C (69.5 °F). Therefore, the sea is cool for swimming.
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