7 day weather forecast

 Effective as of 12:00 AM Thursday May 20 2021

Explanatory notes:

Ridge of high pressure building to the south leads to fine conditions.

The slight chance of patches of fog early today, most likely over the hills with radiational cooling of moist low level air.

A prefrontal trough and cold front brings showers and possible thunderstorms on Saturday with a moist and unstable atmosphere.

A cold air unstable air mass behind the front leads to showers and the slight chance of thunderstorms depending on the depth of the instability. Showers likely clearing early next working week as the ridge of high pressure builds to the south.

Thursday May 20:

City:

10-25  Degrees Celsius

Mostly sunny.

Chance of any rain:0%

Amount:Nil

Perth Metropolitan Area:

Mostly sunny.Patches of fog possible early, most likely over the hills.Light winds tending easterly at 10-20 km/h in the morning tending south-southwesterly at 10-20 km/h in the afternoon.​

Friday May 21:

City:

10-24  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.

Saturday May 22:

City:

12-21  Degrees Celsius

Showers.

Chance of any rain:100%

Amount:8 to 20 mm

Perth Metropolitan Area:

Partly to mostly cloudy. A very high (100%) chance of showers.The chance of a thunderstorm.Light winds tending northeasterly at 10-20 km/h in the morning shifting northwesterly at 20-30 km/h from late morning shifting southwesterly at night.

Sunday May 23:

City:

10-18  Degrees Celsius

Showers.

Chance of any rain:80%

Amount:2 to 8 mm

Perth Metropolitan Area:

Partly to mostly cloudy.A high (80%) chance of showers.The chance of a thunderstormWinds southwesterly at 15-30 km/h.

Monday May 24:

City:

9-18  Degrees Celsius

Showers.

Chance of any rain:70%

Amount:2 to 8 mm

Perth Metropolitan Area:

Partly to mostly cloudy.A high (70%) chance of showers.Winds southwesterly at 10-25 km/h.

Tuesday May 25:

City:

8-19  Degrees Celsius

Partly cloudy.

Chance of any rain:10%

Amount:Nil

Perth Metropolitan Area:

Partly cloudy.Light winds.

Wednesday May 26:

City:

7-21  Degrees Celsius

Mostly sunny.

Chance of any rain:5%

Amount:Nil

Perth Metropolitan Area:

Mostly sunny.Winds east-northeasterly at 10-20 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).