Perth, where it is

In Perth, a city located in south-western Australia (in the state of Western Australia), 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.
Here are the average temperatures.
Perth - Average temperatures
Min (°C)16171512108778101214
Max (°C)313129252118171820222528
Min (°F)616359545046454546505457
Max (°F)888884777064636468727782

Rainfall amounts to about 880 millimeters (34.6 inches) per year, the bulk of which occurs in the cold season, from May to September. Here is the average precipitation.
Perth - Average precipitation

Winter, from June to August, is mild, in fact the average of the coldest months, July and August, is about 12/13 °C (54/55 °F). The rains, however, are frequent and abundant because the flow of western disturbances in this season moves to the north and reaches Southern Australia. With the warm wind from the north, the temperature can exceed 20 °C (68 °F) even in winter, while 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; during the day, however, the temperature remains fairly mild also in these cases.

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 occasionally some thunderstorms may occur, while there's no shortage of wind, which regularly blows from the ocean, as intense afternoon breeze, called "Fremantle Doctor". Fremantle is a coastal town, where in summer the maximum temperature does not exceed 28 °C (82 °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 with this wind the temperature can reach 35/37 °C (95/99 °F).

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 in winter it is decent, since periods of bad weather alternate with sunny periods.
Perth - Sunshine

For swimming, the ocean temperature is never warm, 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
Temp (°C)222223232221201919192021
Temp (°F)727273737270686666666870

Best Time

The best times to visit Perth are spring and autumn, in particular in April-May and in 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 these seasons are also quite rainy (although April is a bit less rainy, so it's preferable), 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. In winter, August is already sunnier and a bit drier than June and July.