Sydney, Melbourne, Brisbane weekend weather: What you need to know

Multiple states are sweltering through a low-intensity to severe heatwave with some temperatures expected to exceed the high forties, while some of the eastern states can expect a wet weekend.

Multiple states are sweltering through a low-intensity to severe heatwave with some temperatures expected to exceed the high forties, while some of the eastern states can expect a wet weekend.

Parts of Queensland, Tasmania, South Australia, and Western Australia are all preparing to be scorched by severe summer conditions over the weekend.

WA and Queensland have been sizzling for some time, but the conditions are now extending into the southeast, the Bureau of Meteorologys Miriam Bradbury told AAP.

A hot weekend is forecast for most parts of Australia.

Pockets of severe intensity heatwaves are forecast for some regions, especially about the Red Centre, through inland Queensland and across western Tasmania.

It wont be as hot this weekend as last, but inland parts of NSW, Victoria, Tasmania, central Australia and WA may experience severe heatwave conditions.

A heatwave is when temperatures are above average during the day and night over a period of three days or more.

For Tasmania, temperatures will reach the low 30s during the day and high teens during the night.

Pockets of severe intensity heatwaves are forecast for some regions, especially about the Red Centre, through inland Queensland and across western Tasmania

Pockets of severe intensity heatwaves are forecast for some regions, especially about the Red Centre, through inland Queensland and across western Tasmania

Multiple states are sweltering through a low-intensity to severe heatwave with some temperatures expected to exceed the high forties

Multiple states are sweltering through a low-intensity to severe heatwave with some temperatures expected to exceed the high forties

That doesnt sound warm for mainland Australians but compared to the averages of Tasmania that is still significantly more, Ms Bradbury said.

In parts of central Australia, inland Queensland and WA temperatures will be eight degrees above average to between 40C and 44C.

The conditions have elevated the bushfire risk with fire danger ratings across most of the nation remaining at moderate to high.

High is before the extreme rating which is when total fire bans are issued.

With moderate to high were still below warning level but its not a sign to let our guard down as we all know how bushfire-prone Australia can be in the summer period, Ms Bradbury said.

Tasmania, southwest WA pushing into SA and western Victoria will experience the most risk of fire danger over the weekend.

Particularly through western Victoria, where weve seen so recently those really terrible bushfires in the Grampians, is one to have on peoples radar, Ms Bradbury said.

While a large swathe of Australia will swelter, east coast cities such as Sydney and Brisbane will have a wet weekend. 

Many Aussies will be looking for ways to beat the heat this weekend

Many Aussies will be looking for ways to beat the heat this weekend

Parts of the east coast are expected to cop a battering from storms

Parts of the east coast are expected to cop a battering from storms

Temperatures will reach into the high 20s, but humidity will be rampant as an easterly flow pushes from the east coast.

The showers and storms already impacting the east coast for a number of days will continue with heavy falls around Sydney on Friday, while the wet weather will increase in Brisbane on Saturday.

The bureau is forecasting showers and thunderstorms with some severe conditions that bring the risk of flash flooding and for Brisbane, damaging wind gusts and hail.

People of the Hawkesbury Nepean Valley are advised to monitor weather conditions.

The Bureau of Meteorology has issued a flood watch for possible minor flooding across parts of the Hawkesbury Nepean Valley from Friday to Saturday.

For all our east coasters, its certainly a weekend to be keeping an eye on the radar, Ms Bradbury said.

A flood watch is already in place for Sydneys Hawkesbury Nepean River as the wet weather continues over the weekend.

Ms Bradbury warned rain expected on Friday may cause minor flooding in parts of the river system.

While a large swathe of Australia will swelter, east coast cities such as Sydney and Brisbane will have a wet weekend

While a large swathe of Australia will swelter, east coast cities such as Sydney and Brisbane will have a wet weekend

Brisbane 

Saturday: Showers. Possible storm. Min 21C Max 25C. 

Sunday: Showers. Min 20C Max 27C. 

Monday: Shower or two. Min 21C Max 29C.

Sydney 

Saturday: Showers. Possible storm. Min 21C Max 26C. 

Sunday: Shower or two. Min 21C Max 28C. 

Monday: Possible shower. Min 20C Max 29C.

Canberra

Saturday: Showers. Possible storm. Min 15C Max 24C. 

Sunday: Shower or two. Possible storm. Min 14C Max 28C. 

Monday: Shower or two. Possible storm. Min 15C Max 29C.

Melbourne

Saturday: Mostly sunny. Min 19C Max 33C. 

Sunday: Shower or two. Possible storm. Min21C Max 29C. 

Monday: Possible storm. Min 18C Max 27C.

Hobart

Saturday: Partly cloudy. Min 15C Max 28C. 

Sunday: Shower or two. Min 18C Max 26C. 

Monday: Shower or two. Min 17C Max 24C.

Adelaide

Saturday: Mostly sunny. Min 17C Max 32C. 

Sunday: Sunny. Min 18C Max31C.

Monday: Sunny. Min 17C Max 32C.

Perth

Saturday: Sunny. Min 16C Max 30C 

Sunday: Partly cloudy. Min 18C Max 28C.

Monday: Partly cloudy. Min 18C Max 28C. 

Darwin

Saturday: Partly cloudy. Min 26C Max 34C. 

Sunday: Shower or two. Min 26C Max 34C. 

Monday: Shower or two. Min 26C Max 35C.