Canberrans can expect a cool change from Monday after a warm and windy weekend.

Brisbane's sweaty masses are set for a slight reprieve leading into the weekend, with the high temperatures and sticky humidity both set to become that little more bearable.

Winter's grip will finally feel like it's loosened amid a "heat spike" this weekend - even if that season's squeeze was not a very tight one.

In a town regarded as one of the world's hottest, Marble Bar locals are still reminded to take care as the mercury hit 48 degrees Celsius on Monday.

Thunderstorms have rumbled their way across Sydney for the ninth consecutive day, with more thunder and lightning on the horizon throughout Monday morning and into the afternoon.

Robert Frost once pondered whether the world would end in fire, or in ice. They weren't heralding the world's end, but this week fire and ice both reared their heads across the state.

Growing winds and driving rain from Hurricane Hermine lashed Florida's northern Gulf Coast on Friday as forecasters warned of "life-threatening" floods.

Residents in north-eastern NSW advised not to travel as heavy rains from another east coast low lift flood risks all the way down to the Hunter.

The Bureau of Meteorology has issued a severe thunderstorm warning for parts of Sydney.

Sydneysiders look set for a soggy commute to end the working week, as an intense low pressure system off the coast delivers widespread showers, wind and large and powerful surf conditions to the city.

If Thursday hits its predicted peak it will be the ACT's longest March heat spell on record.

Sydneysiders can expect more rain to fall tonight before it clears to a cloudy but chilly Monday morning.

A severe storm is expected to narrowly miss Canberra on Monday afternoon.

Canberrans still wringing themselves out from the wettest June on record shouldn't put away their gumboots just yet.

Sydneysiders can expect several days of rain-soaked commutes after an early morning downpour ended three weeks of uninterrupted sunshine.

It will snow in the ACT tonight as a cold front moves over the region, the Bureau of Meteorology says.

Temperatures in Canberra reached 38.5 degrees as the region's first heatwave of the year peaked on Wednesday.

Sydney in for scorching weather on Friday as a slow-moving high-pressure system steers a huge hot air mass formed over Australia's Red Centre to the country's south-east.

A fierce blast of winter has prompted a severe weather warning for most of southern NSW, including Sydney.

Global temperature records continue to tumble, with August easily the hottest in 124 years of data, Japan's Meteorological Agency says.