7 day weather forecast

 Effective as of 4:00 PM Wednesday May 5 2021

Explanatory notes:

Perth Airport experienced the wettest May (climatological) day in 58 years that is since May 25 1963 where 55.4 mm of rain fell and the 3rd wettest on record just shy of the record of 57.4 mm set on May 3 1947 as 53.8 mm fell in the 24 hours to 9 AM this morning.

Most of the rain fell in areas of heavy rain stalling over the airport and some areas in a rain band ahead of an upper level disturbance fed by tropical moisture.

A shower or two possible in the moist onshore flow for the rest of today. A band of low level wind convergence near the coast acts as a focus for shower activity overnight.

On Thursday a surface trough ahead of an upper level trough bring showers with possible thunderstorms. 

After the trough moves to the east, some showers streaming from the southwest until Friday morning in the moist cool air mass.

Ridge of high pressure builds to the south thereafter leading to fine conditions.

The slight chance of fog early on Saturday and Sunday with light winds radiational cooling of moist air, also the slight chance early on Friday if skies are sufficiently clear and winds are sufficiently light given moist low level air and moist soils from earlier showers.

Warmer afternoons early next week with warm air advection as the high moves into the Great Australian Bight.

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The rest of Wednesday May 5:

City:

Possible shower.

Chance of any rain:30%

Perth Metropolitan Area:

Partly cloudy.A slight(30%) chance of showers.Winds west-northwesterly at 15-25 km/h becoming northwesterly at night.​

Thursday May 6:

City:

14-21  Degrees Celsius

Showers.

Chance of any rain:100%

Amount:5 to 12 mm

Perth Metropolitan Area:

Partly to mostly cloudy.A very high (100%) chance of showers.The chance of a thunderstorm in the late morning and early afternoon.Winds north-northwesterly at 5-15 km/h becoming westerly in the afternoon, southwesterly at night.

Friday May 7:

City:

11-22  Degrees Celsius

Possible early shower.

Chance of any rain:30%

Amount:0 to 0.4 mm

Perth Metropolitan Area:

Partly cloudy. A slight (30%) chance of showers early most likely near the coast.Winds southeasterly at 10-20 km/h tending south-southwesterly at 15-25 km/h in the afternoon.

Saturday May 8:

City:

9-22  Degrees Celsius

Partly cloudy.

Chance of any rain:5%

Amount:Nil

Perth Metropolitan Area:

Partly cloudy.Light winds tending south-southwesterly at 10-20 km/h in the afternoon, south-southeasterly at night.

Sunday May 9:

City:

9-22  Degrees Celsius

Partly cloudy.

Chance of any rain:10%

Amount:Nil

Perth Metropolitan Area:

Partly cloudy.Light winds tending southwesterly at 10-20 km/h in the afternoon.

Monday May 10:

City:

10-24  Degrees Celsius

Sunny.

Chance of any rain:0%

Amount:Nil

Perth Metropolitan Area:

Sunny.Winds easterly at 10-20 km/h becoming light int he afternoon.

Tuesday May 11:

City:

11-25  Degrees Celsius

Partly cloudy.

Chance of any rain:5%

Amount:Nil

Perth Metropolitan Area:

Partly cloudy.Winds northeasterly at 10-20 km/h becoming light in the afternoon.

Wednesday May 12:

City:

12-22  Degrees Celsius

Partly cloudy.

Chance of any rain:20%

Amount:Nil

Perth Metropolitan Area:

Partly cloudy.A slight(20%) chance of a shower.Winds south-southeasterly at 15-30 km/h

Charts:

                                   

Figure 1.Surface synoptic chart.Image courtesy of the Australian Bureau of Meteorology(BOM).

 2. 

Figure 2.Key features identified on True Colour RGB satellite image.Satellite image courtesy of the Japanese Meteorological Agency(JMA).

Figure 3.Mean Sea Level Pressure(MSLP) analysis with infrared greyscale satellite image. Image courtesy of the Australian Bureau of Meteorology(BOM)

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

No liabilities held from information consumed on this site. Weather icons are from the US National Weather Service.Some information on this site is from the Australian Bureau of Meteorology (BOM).