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Weather forecast for Perth effective as of 5:00 PM Monday December 25:

Explanatory notes:
Scroll down below this section for forecast. 

Figure 1.Surface synoptic chart at 06 UTC(2 PM local time today).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 today).Satellite image courtesy of the Japanese Meteorological Agency(JMA).

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

The west coast trough is moving inland with the marine layer advecting over the region.

Cooler air mass lies over the region from Tuesday with the west coast trough inland resulting in maximum temperatures in the mid 20s.Mostly sunny conditions.

The sea breezes will be particularly strong on Wednesday,Thursday and Saturday with a south to southeasterly pressure gradient "bending" with solar heating.


The air mass over the region warms up again towards the end of the week with warm air advection as a west coast trough forms near the west coast.

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 Monday December 25:

City:

Clear.

Chance of any rain:0%

Perth metropolitan area:

Clear.Winds southwesterly at 20-30 km/h from afternoon becoming south-southwesterly at 15-25 km/h at night.

Tuesday December 26:

City:

17-27 Degrees Celsius

Mostly sunny.

Chance of any rain:0%

Rainfall amount:0 mm.



Perth metropolitan area:

Sunny.Winds southerly at 10-20 km/h becoming southwesterly at 20-35 km/h from around the middle of the day becoming south-southwesterly at 15-25 km/h at night.

Wednesday December 27:

City:

15-26 Degrees Celsius

Becoming sunny.Breezy in the afternoon and evening.

Chance of any rain:0%

Rainfall amount:0 mm.

Perth metropolitan area:

Mostly sunny becoming sunny by afternoon.Winds south-southeasterly at 10-20 km/h becoming southwesterly at 25-40 km/h in the afternoon and evening becoming southerly at 20-35 km/h at night.Wind gusts in excess of 50-60 km/h possible over coastal and riverside suburbs in the afternoon and evening.

Thursday December 28:

City:

15-29 Degrees Celsius

Sunny.Breezy in the afternoon and evening.

Chance of any rain:0%

Rainfall amount:0 mm.

Perth metropolitan area:

Sunny.Winds southeasterly at 10-20 km/h becoming south-southwesterly at 30-45 km/h in the afternoon and evening becoming south-southwesterly at 20-35 km/h at night.Wind gusts in excess of 60 km/h possible over coastal and riverside suburbs in the afternoon and evening.

Friday December 29:

City:

16-31 Degrees Celsius

Sunny.

Chance of any rain:0%

Rainfall amount:0 mm.

Perth metropolitan area:

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

Saturday December 30:

City:

18-32 Degrees Celsius

Mostly sunny.Breezy in the afternoon and evening.

Chance of any rain:10%

Rainfall amount:0 mm.

Perth metropolitan area:

Mostly sunny.A slight(20%) chance of a shower or thunderstorm over the north from afternoon,a near zero chance elsewhere.Winds easterly at 15-25 km/h becoming southwesterly at 25-40 km/h in the afternoon and evening becoming south-southeasterly at 20-30 km/h at night.Wind gusts in excess of 60 km/h possible over coastal and riverside suburbs in the afternoon and evening.

Sunday December 31:

City:

19-31 Degrees Celsius

Mostly sunny.

Chance of any rain:10%

Rainfall amount:0 mm.

Perth metropolitan area:

Mostly sunny.A slight(20%) chance of a shower or thunderstorm over the north and east between afternoon to early night,a near zero chance elsewhere.Winds southerly at 10-20 km/h becoming south-southwesterly at 20-30 km/h in the afternoon and evening becoming southerly at 15-30 km/h at night becoming southeasterly at 10-20 km/h later at night.

Monday January 1:

City:

18-32 Degrees Celsius

Mostly sunny.

Chance of any rain:10%

Rainfall amount:0 mm.

Perth metropolitan area:

Mostly sunny.A slight(20%) chance of a shower or thunderstorm over the north and east between afternoon to early night,a near zero chance elsewhere.Winds easterly at 10-20 km/h becoming south-southwesterly at 20-30 km/h in the afternoon and evening becoming southeasterly at 15-25 km/h at night.

Weather forecast  produced at 5:00 PM Monday December 25.Some of the weather icons courtesy of the US National Weather Service.