A typical winter situation is when a low pressure system is located south of the state, which leads to a series of cold fronts to move across Perth, giving showers, gusty winds and possible thunderstorms depending on the severity of the front.
As the low pressure system and its associated cold fronts move east, a high pressure system will usually take its place giving sunny mild days and cool nights, as the high moves east, northerly winds will strengthen ahead of another cold front, this is the usual sequence during a Perth winter.
Winters in Perth are quite mild compared to many other cities around the world, but heaters are still needed for most people to feel comfortable. The coldest temperature ever recorded in Perth City was the overnight minimum of 0.0 C on the 27th July, 1998 and on the 15th July, 1997, this beat the old record of 1.2 C on the 7th July, 1916. Click here for more information on the record cold minimum temperatures which occurred in July, 1997. The coldest daily maximum ever recorded was 8.8 C on the 26th June, 1956.
Perth has never recorded snow on the ground before, however it receives plenty of rain during the three winter months. June is the wettest averaging 182 mm, July averages 173 mm and August averages 135 mm.
Daily rainfall on some occasions can be quite large, the wettest winter day ever recorded occurred on the 10th June, 1920, when 99.1 mm of rain fell. Other noticeable daily rainfalls was the 95.0 mm which fell on the 29th July, 1987, the 86.1 mm which fell on the 18th June, 1945 and on the 25th June, 1986 when 77.0 mm of rain fell on the city.
Strong cold fronts can not only bring a lot of rain to Perth, but can cause a lot of damage. On the 23rd May, 1994 one of the strongest cold fronts ever to hit the south-west of Western Australia moved through Perth. Heavy showers, thunderstorms and gale force winds lashed Perth for most of the day and night with severe wind squalls, much of the city had power blackouts. Many homes received damage, while tree damage was widespread. This storm was rare as it occurred very early in the season, the strongest cold fronts usually occur between mid June and early August.
The winter months is the best time for the development of tornadoes in the south-west of Western Australia, including Perth. Isolated tornadoes can form in strong cold fronts as was the case on the 15th July, 1996 when a tornado developed and touched town in the suburb of South Perth, click here for a report on that tornado.
Averages and extremes in Perth for the winter months:
JUN JUL AUG Av.MAX 18.7 17.7 18.3 Av.MIN 10.4 9.2 9.3 Hi.MAX 28.1 26.3 27.8 Hi.MIN 18.7 16.1 16.6 Lo.MAX 8.8 10.5 9.9 Lo.MIN 1.6 0.0 1.4 Av.RAIN 182.0 173.0 135.0
To see what winter is offering Perth today, check the Latest Forecast the Current Conditions and the Perth Live Weather Cams
Severe storms play a role in Perth winters each year, check the Bureau of Meteorology's National Warnings Page to see if any warnings are current for the city.