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Weather forecast for Perth effective as of 12:00 AM Thursday January 4:

Explanatory notes:
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.

With earlier sea breezes and slightly cooler air mass with the west coast trough inland slightly lower maximum temperatures occurred on Wednesday but the humid marine layer lies over the region.
Similar conditions today.

Then the west coast trough moves further inland with cooler air mass over the region advecting from Friday afternoon with the marine layer over the region in the morning,cooler air mass moving in from afternoon with a weak cold front brushing the southwest of the state,as a result lower maximum temperatures.

Saturday morning would likely be the coolest morning in the forecast period with cold air advection from the southeast.

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

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.

The forecast:

The rest of Thursday January 4:

City:

18-30 Degrees Celsius

Sunny.

Chance of any rain:0%

Rainfall amount:0 mm.

Perth metropolitan area:

Sunny.Winds south to southeasterly at 5-15 km/h becoming southwesterly at 20-30 km/h in the afternoon and evening becoming south-southwesterly at 10-20 km/h at night becoming light later at night.Maximum temperatures range from 27 Degrees Celsius over coastal areas to 33 Degrees Celsius over inland coastal plain,around 30 Degrees Celsius about the city centre.

Friday January 5:

City:

16-26 Degrees Celsius

Partly cloudy.

Chance of any rain:10%

Rainfall amount:0 mm.

Perth metropolitan area:

Partly cloudy.Light winds becoming south-southwesterly at 10-20 km/h in the morning becoming southwesterly at 20-35 km/h in the afternoon and evening becoming south-southwesterly at 20-30 km/h at night.

Saturday January 6:

City:

13-28 Degrees Celsius

Sunny.

Chance of any rain:0%

Rainfall amount:0 mm.

Perth metropolitan area:

Sunny.Winds south to southeasterly at 15-25 km/h,becoming south-southwesterly at 20-30 km/h over western suburbs in the afternoon spreading inland in the late afternoon becoming southerly at 10-20 km/h at night.

Sunday January 7:

City:

16-31 Degrees Celsius

Sunny.Breezy in the afternoon and evening.

Chance of any rain:0%

Rainfall amount:0 mm.

Perth metropolitan area:

Sunny.Winds east-southeasterly at 10-25 km/h becoming south-southwesterly at 25-40 km/h in the afternoon and evening becoming south to southeasterly at 15-25 km/h at night.Wind gusts in excess of 60 km/h possible over coastal and riverside suburbs in the afternoon and evening. 

Monday January 8:

City:

16-32 Degrees Celsius

Sunny.

Chance of any rain:0%

Rainfall amount:0 mm.

Perth metropolitan area:

Sunny.Winds east-southeasterly at 15-30 km/h becoming south-southwesterly at 15-25 km/h in the afternoon and evening becoming south-southeasterly at 15-25 km/h at night.

Tuesday January 9:

City:

19-33 Degrees Celsius

Sunny.

Chance of any rain:0%

Rainfall amount:0 mm.

Perth metropolitan area:

Sunny.Winds south to southeasterly at 15-25 km/h becoming south-southwesterly at 20-35 km/h in the afternoon and evening becoming south to southwesterly at 20-30 km/h at night.

Wednesday January 10:

City:

19-30 Degrees Celsius

Some high clouds possible(mostly sunny)

Chance of any rain:10%

Rainfall amount:0 mm.

Perth metropolitan area:

Some high clouds possible(mostly sunny).Winds southeasterly at 15-25 km/h becoming south to southwesterly 20-35 km/h from afternoon.

Weather forecast for today produced at 1:00 AM,forecast for the rest of the days produced at 10:00 PM Wednesday January 3.Some of the weather icons courtesy of the US National Weather Service.