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Scroll down below this section for forecast. 

Figure 1.Surface synoptic chart at  12 UTC(8 PM local time yesterday).Image courtesy of the Australian Bureau of Meteorology(BOM).

Figure 2.Key features identified on True Colour RGB satellite image at around 07:00 UTC(3 PM local time yesterday).Satellite image courtesy of the Japanese Meteorological Agency(JMA).

Figure 3:Surface synoptic prognosis.Image courtesy of the Australian Bureau of Meteorology(BOM).

There is now a 3 hourly forecast available on the sidebar.

A strong sea breeze occurred on Sunday as a southeasterly pressure gradient "bended" with solar heating.Wind gusts to 61 km/h occurred at Ocean Reef.

With warm air advection and a west coast trough building near the west coast,rising maximum temperatures.

Hot on Monday and Tuesday.

Strong winds on Wednesday and lower maximum temperatures.Wind gusts up to 60-65 km/h possible between afternoon to early night.

On Thursday a weak cold front likely brushes the region in the morning bringing possible showers.

Then rapidly warming conditions with another west coast trough forming near the west coast.

Some uncertainty late next weekend with conditions depending on the movement of a tropical weather system.

I have also added a new weather radar page available here.

The precis(summary) forecasts and "chance of any rain forecasts" are for Perth City while the detailed description underneath the precis forecasts is for the forecast area of Perth but the chance of rain forecasts in the detailed description underneath the precis forecasts is the average for the forecast area 

unless otherwise stated.

Time of day:
Cooler months(May 1-September 30):
Early hours:12AM-7AM 
Morning:before 12PM
Middle of the day:11AM to 1PM
Afternoon:1PM to 5PM
Evening:5PM to 7PM
Night:After 6:30 PM.

About forecasts.