A wet weather forecast for the capital will likely bring up to 30 millimetres of rain on Sunday, with the possibility of up to 50 millimeters falling in 24 hours in the ACT this weekend.
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Showers are expected to hit Canberra on Friday afternoon and fall intermittently throughout Saturday.
A low pressure system moving across the state was forecast to bring more heavier rainfall on Saturday afternoon and evening, continuing into Sunday.
The Bureau of Meteorology has warned thunderstorms are likely in Canberra on Sunday afternoon as that broader rain system moves through.
The bureau's Agata Imielska said Canberra people planning to travel this weekend should be aware of an increased flood risk across NSW.
"With the rainfall we had last week and flooding in some parts of NSW and more rain on the way, it's really important to be mindful of any warnings such as thunderstorm that could produce that heavy rainfall," she said.
"Also of that flood risk and keeping a close eye on any flood warnings."
Temperatures are expected to peak at 19 degrees in the ACT on Saturday and 17 degrees on Sunday, after a balmy 21 degrees on Friday afternoon.
Ms Imielska said warmer weather typically signalled the start of the more severe weather season, which would now settle in for the summer.
"Thunderstorms quite like warmer conditions so we tend to see a higher frequency during the warmest part of the year," she said.
"We also have different climate influences that tilt risks in terms of what we might see throughout the season.
"Now we're seeing both the Pacific and the Indian Ocean pushing for those wetter conditions."
Increased frequency of thunderstorms meant an increased likelihood of damaging conditions such as really strong winds, intense rain, hail or even tornadoes in extreme cases, she said.
Should thunderstorms reach Canberra this weekend it would likely be late in the afternoon or evening on Saturday or throughout the day on Sunday.
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Ms Imielska said as it was such a broad system it was hard to pinpoint which part of NSW would be most affected.
"It really is affecting most of NSW in terms of the rainfall that we are seeing," she said.
With Forbes evacuated this week due to flooding, Ms Imielska said the Central West town was not yet out of the woods.
"It takes quite a long time for the water to really move through the river system in the Lachlan," she said.
"The community out there does an amazing job preparing for potential flood risk and luckily we saw the river just shy of the major flood level," she said.
"But we're still seeing major flood peaks occurring downstream as that water is still moving through the system. More rain is not ideal."
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