7 day weather forecast

Effective as of 4:00 PM Tuesday August 4 2020

Explanatory notes:




Perth has seen the coldest August day in 52 years on Monday that is since August 27 1968 with the maximum temperature at Perth Metro being 12.1˚C at 12:47 PM and coldest winter day since June 16 2005 of 12.1˚C (draw) and 11.5˚C on June 12 2005.

The cold day was due to the deep cold air mass over the region along with rain cooled low level air lying over the region creating a land breeze which kept the warmer maritime air offshore and clouds and showers which formed in the unstable atmosphere offshore enhanced by low level wind convergence of the land breeze and near the cut off low kept advecting onshore keeping a lid on temperatures.

Swanbourne recorded their coldest winter day on record with a maximum temperature of only 11.6˚C beating the record of 12.2˚C set on July 26 1998 and the coldest August day on record beating the record of 12.8˚C on August 4 1994. Records exist from September 1993.

Wednesday August 5:

City:

9-19 Degrees Celsius

Clouds increasing.

Chance of any rain:5%

Amount:Nil

Perth Metropolitan Area:

A mostly sunny morning with clouds developing to become partly to mostly cloudy in the afternoon.Winds south-southeasterly at 15-25 km/h tending southeasterly at 20-30 km/h during the morning and early afternoon.

Thursday August 6:

City:

7-18 Degrees Celsius

Clouds increasing.

Chance of any rain:5%

Amount:Nil

Perth Metropolitan Area:

Mostly sunny morning with clouds developing to become partly cloudy in the afternoon.Winds east-southeasterly at 10-20 km/h.

Friday August 7:

City:

6-17 Degrees Celsius

Partly cloudy.

Chance of any rain:5%

Amount:Nil

Perth Metropolitan Area:

Partly cloudy.Winds east-northeasterly at 10-20 km/h.

Saturday August 8:

City:

7-20 Degrees Celsius

Possible PM shower

Chance of any rain:30%

Amount:0 to 1 mm

Perth Metropolitan Area:

Partly cloudy.A slight(30%) chance of showers from afternoon.Winds east-northeasterly at 20-30 km/h becoming northeasterly during the day.

Sunday August 9:

City:

12-17 Degrees Celsius

Showers,rain.

Chance of any rain:100%

Amount:10 to 30 mm

Perth Metropolitan Area:

Partly to mostly cloudy.A very high(100%) chance of showers,rain.The chance of a thunderstorm.Winds northeasterly at 25-40 km/h shifting northwesterly later during the day.

Monday August 10:

City:

11-19 Degrees Celsius

Showers.Possible thunderstorm.

Chance of any rain:95%

Amount:10 to 25 mm

Perth Metropolitan Area:

Partly to mostly cloudy.A very high(95%) chance of showers.The chance of a thunderstorm.Winds northwesterly at 15-25 km/h shifting west-northwesterly at 30-45 km/h during the day.Gusty winds possible.

Tuesday August 11:

City:

12-19 Degrees Celsius

Showers.

Chance of any rain:90%

Amount:3 to 10 mm

Perth Metropolitan Area:

Partly to mostly cloudy.A very high(90%) chance of showers.The chance of a thunderstorm.Winds westerly at 20-30 km/h.

Charts:

Figure 1.Surface synoptic chart at 00 UTC(8 AM local time today).Image courtesy of the Australian Bureau of Meteorology(BOM). 

Figure 3.Key features identified on True Colour RGB satellite image at around 06:00 UTC(2 PM local time today).Satellite image courtesy of the Japanese Meteorological Agency(JMA).

Figure 3.Mean Sea Level Pressure(MSLP) analysis with infrared greyscale satellite image at 00 UTC(8 AM 
local time today).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).