7 day weather forecast

  Effective as of 12:00 AM Thursday December 23 2021

View the latest severe weather warnings from BOM at http://www.bom.gov.au/wa/warnings/ .

Explanatory notes:

An unusually intense heatwave, possibly Perth's worst December heatwave on record is likely from Christmas Eve (today over inland areas) as a very hot air mass lies over the region with the west trough deepening and lying offshore for several days and an upper level high leading to subsidence heating of the airmass. Perth's longest December 40+°C spell on record was 3 consecutive days in December 2019. Prior to December 2019, 3 consecutive 40+°C days was underheard of in December. Conditions would also be extremely bad in terms of bushfires with significant dry easterly winds expected. The easterlies would be particularly strong early on Christmas day and again later at night on Christmas Day and early on boxing day where the strong easterly gradient combined with katabatic effect could lead to gusts in excess of 70 km/h over the hills and foothills.

There is some uncertainty on how and whether the heatwave ends towards the end of the forecast period with variation between models and model ensembles on the evolution of the west coast trough and resulting temperatures, it depends on some tropical systems in the north of the country.

Thursday December 23:

City:

19-35  Degrees Celsius

Mostly sunny.

Chance of any rain:0%

Amount:Nil

Perth Metropolitan Area:

High clouds (mostly sunny).Very hot inland.Winds east-southeasterly at 10-20 km/h tending south-southwesterly a 20-30 km/h in the afternoon and evening becoming southeasterly at 15-25 km/h later at night.

Friday December 24:

City:

21-39  Degrees Celsius

Very hot and sunny.

Chance of any rain:0%

Amount:Nil

Perth Metropolitan Area:

Very hot and sunny.Winds east-southeasterly at 15-25 km/h tending south-southwesterly at 20-30 km/h in the afternoon becoming east-southeasterly at 25-40 km/h at night.

Saturday December 25:

City:

22-43  Degrees Celsius

Very ho ho hot and sunny.

Chance of any rain:0%

Amount:Nil

Perth Metropolitan Area:

Very hot and sunny.Winds easterly at 25-40 km/h becoming northeasterly at 20-30 km/h in the morning easing to 10-20 km/h in the afternoon with a south-southwsterly sea breeze at 10-20 km/h possible in the afternoon, becoming easterly at 20-35 km/h later at night.Gusts in excess of 70 km/h possible over the hills and foothills early and again later at night.

Sunday December 26:

City:

27-43  Degrees Celsius

Very hot and sunny.

Chance of any rain:0%

Amount:Nil

Perth Metropolitan Area:

Very hot and sunny.Winds east-northeasterly at 20-35 km/h becoming northeasterly in the morning and easing to 10-20 km/h in the afternoon.

Monday December 27:

City:

26-41  Degrees Celsius

Very hot and mostly sunny.

Chance of any rain:0%

Amount:Nil

Perth Metropolitan Area:

Very hot and mostly sunny.Winds northeasterly at 15-25 km/h tending south-southwesterly at 10-20 km/h in the afternoon and evening.

Tuesday December 28:

City:

25-39  Degrees Celsius

Very hot and mostly sunny.

Chance of any rain:0%

Amount:Nil

Perth Metropolitan Area:

Very hot and mostly sunny.Winds northeasterly at 15-25 km/h shifting southwesterly by afternoon.

Wednesday December 29:

City:

21-35  Degrees Celsius

Mostly sunny.

Chance of any rain:0%

Amount:Nil

Perth Metropolitan Area:

Mostly sunny.Light winds tending southwesterly at 15-25 km/h in the afternoon.

Charts: