The Millennium Stadium is surrounded by water, train lines and city centre roads are submerged and shops are closed because of water damage.
The campaign warns of increased flooding affecting Wales
This is Cardiff of the future if climate change is not addressed, according to the environmental charity WWF Cymru at a campaign launch.
The warning comes as a poll by YouGov found 70% of UK residents believed climate change was a real threat.
The "Stop Climate Chaos" campaign is backed by weather presenter Sian Lloyd.
Ms Lloyd unveiled a row of bikes with images of extreme weather affecting Wales in the city centre next to the Millennium Stadium, which is at the centre of their publicity.
"Climate change is left unaddressed will not only have global consequences but it will also have a significant impact on Wales," she said.
"It's likely that we will experience greater rainfall along with more frequent and severe weather events such as droughts, flooding and heatwaves."
Morgan Parry, head of WWF Cymru, said: "Although this image is set in the future there is increasing evidence to suggest that climate change is going to cause massive disruption over the coming decades unless we do something now.
"If we choose to ignore the threat, Cardiff is at increased risk of flooding and extreme weather events.
"Do we really want to wait until Cardiff is under water or our house insurance has gone up before we do anything?"
The survey for the charity by YouGov, which interviewed 1999 adults across the UK, including 200 in Wales, found Welsh people were the most concerned about the effects extreme changes in the weather would have on them.
Increased flooding was a particular worry for 75%.
Mr Parry added: "This poll clearly shows that the public support much stronger action on climate change.
"We may only have a decade to take action to reduce soaring greenhouse gas emissions. It is vital that the next government makes the right decisions over the next parliamentary term.
"Ignoring this issue is not an option."
Results showed 95% of people supported tougher regulations on businesses to reduce their greenhouse gas emissions. - 63% believed industry was not doing enough to tackle the problem of climate change.