7 day weather forecast

Effective as of 4:00 AM Wednesday May 5 2021

Explanatory notes:

A rainband fed with tropical moisture ahead of an upper level trough brought lots of rain over the past few hours. The record for the wettest May (climatological) day on record could, depending on how much more rain falls to 9 AM,  be under threat for Perth Airport beating the record of 57.4 mm set on May 3 1947 and also for the Mt Lawley site beating the record of 50.4 mm set on May 2 2005.

The slight chance of a thunderstorm, once the upper level disturbance and surface trough move to the east, thunderstorm chances diminish but showers are still expected in the moist onshore flow.

During Thursday, another upper level trough and associated upper level cold pool approaches from the west bringing showers and possible thunderstorms, most likely in the late morning and early afternoon.

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

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Wednesday May 5:

City:

14-23  Degrees Celsius

Showers.Possible early thunderstorm.

Chance of any rain:100%

Amount:10 to 30 mm

Perth Metropolitan Area:

Partly to mostly cloudy.A very high (100%) chance of rain and showers with the chance of a thunderstorm early easing to a high (80%) chance of showers from morning.Heavy falls possible early.Winds north-northeasterly at 10-20 km/h becoming northwesterly by morning shifting west-northwesterly at 15-25 km/h by late morning becoming light later at night.

Thursday May 6:

City:

14-21  Degrees Celsius

Showers.

Chance of any rain:100%

Amount:5 to 15 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 southwesterly in the afternoon, becoming light.

Friday May 7:

City:

11-22  Degrees Celsius

Partly cloudy.

Chance of any rain:20%

Amount:Nil

Perth Metropolitan Area:

Partly cloudy. Slight(20%) chance of a shower early most likely near the coast.Light winds becoming southeasterly at 10-20 km/h in the morning 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 southwesterly at 10-20 km/h in the afternoon.

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

Mostly sunny.

Chance of any rain:0%

Amount:Nil

Perth Metropolitan Area:

Mostly sunny.Winds easterly at 10-20 km/h.

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 15-25 km/h becoming light in the afternoon.

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).