7 day weather forecast

Effective as of 4:00 AM Friday September 4 2020

Explanatory notes:

Plenty of stratocumulus clouds associated with a moist westerly flow trapped under a subsidence inversion.
Possible showers, most likely in the south due to higher susbidence inversion heights.

12Z ECMWF model run have subsidence inversion heights over the city lower than the 00Z run.

Friday September 4:

City:

15-21 Degrees Celsius

Possible shower.

Chance of any rain:30%

Amount:0 to 0.4 mm

Perth Metropolitan Area:

Mostly cloudy.A medium(50%) chance of showers in the south, grading to a slight(20%) chance in the north.Light winds tending west-northwesterly at 10-20 km/h between late morning and evening.

Saturday September 5:

City:

9-22 Degrees Celsius

Partly cloudy.

Chance of any rain:20%

Amount:Nil

Perth Metropolitan Area:

Partly cloudy.Fog possible early, most likely over the hills.A slight(30%) chance of showers in the southwest from afternoon, a slight(20%) chance elsewhere.Light winds becoming northwesterly at 15-25 km/h from late morning.

Sunday September 6:

City:

15-21 Degrees Celsius

Windy with showers.

Chance of any rain:100%

Amount:5 to 15 mm

Perth Metropolitan Area:

Mostly cloudy.A very high (100%) chance of showers.Winds northwesterly at 20-30 km/h increasing to 25-40 km/h in the morning shifting west-northwesterly at 20-35 km/h during the afternoon.Gusty winds during the day.

Monday September 7:

City:

12-19 Degrees Celsius

Shower or two.

Chance of any rain:70%

Amount:0.4 to 2 mm

Perth Metropolitan Area:

Partly to mostly cloudy.A high (70%) chance of showers.Winds west-southwesterly at 15-30 km/h becoming light at night.

Tuesday September 8:

City:

9-21 Degrees Celsius

Partly cloudy.

Chance of any rain:10%

Amount:Nil

Perth Metropolitan Area:

Partly cloudy.Light winds.

Wednesday September 9:

City:

10-22 Degrees Celsius

PM showers.

Chance of any rain:70%

Amount:0 to 5 mm

Perth Metropolitan Area:

Partly cloudy.A high(70%) chance of showers from afternoon.Light winds becoming northwesterly at 15-25 km/h during the day.

Thursday September 10:

City:

12-19 Degrees Celsius

Possible showers.

Chance of any rain:50%

Amount:0 to 4 mm

Perth Metropolitan Area:

Partly cloudy.A medium(50%) chance of showers from afternoon.Light winds becoming northwesterly at 15-25 km/h during the day.

Charts:

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 06:00 UTC(2 PM local time yesterday).Satellite image courtesy of the Japanese Meteorological Agency(JMA).

Figure 3.Mean Sea Level Pressure(MSLP) analysis with infrared greyscale satellite image at 12 UTC(8 PM 
local time yesterday).Image courtesy of the Australian Bureau of Meteorology(BOM).

Figure 4:Surface synoptic prognosis.Image courtesy of the Australian Bureau of Meteorology(BOM).

Some data on this site is sourced from the Australian Bureau of Meteorology(BOM). Weather icons from the US National Weather Service.