Temperatures in Sydney are forecast to reach 29 degrees on Tuesday and 28 on Wednesday, while tops of 33 degrees are expected on both days in the west.
While warm, the temperatures and storms are a far cry from the 40 degrees reached in the city on Saturday, and the damaging hailstorm that hit the coast of NSW just before Christmas.
Mr Cronje said Tuesday’s thunderstorms are not expected to be as severe, but “any thunderstorm can produce hail”.
“Specific severe weather is not necessarily expected from these [storms], but having said that, thunderstorms could produce strong winds and heavy rain, localised heavy falls and hail,” he said.
The senior meteorologist said rainfall is also not expected to be particularly heavy.
“We could see widespread falls of about 1 to 5 millimetres and then localised very heavy falls,” he said.
“Where exactly that would be, just because of the nature of thunderstorms, is a bit tricky to say.”
A reprieve from thunderstorms and rain is expected on Saturday, with a forecast for a mostly sunny day and tops of 29 degrees in the city, but 35 degrees and the slight chance of a shower in the west.
The thunderstorms forecast for Tuesday afternoon come on the back of fog that covered some parts of Sydney in the morning.
“It wasn’t necessarily thick, but there were wisps of it around,” Mr Cronje said.
The senior meteorologist said the morning fog was expected given the rainy and warm conditions.
“Whenever we’ve had rain and it’s hot enough, and there’s no cloud overnight and it’s clearing in the morning, that’s a notorious fog formation,” he said.
Rachel Clun is a journalist at The Sydney Morning Herald.