The spiders, which are ground-dwelling creatures, could seek shelter from floodwaters inside residences.
The Australian Reptile Park has reported an increase in sightings during the floods, along with a surge in funnel-web numbers donated to their antivenom program.
In particular, more spiders than usual have been handed in from Hornsby and Mona Vale in Sydney, Wyoming on the Central Coast, and New Lambton in Newcastle.
“We’re receiving more and more reports of funnel-webs being found in homes as they seek refuge from the water and we’re urging the public to be on the lookout and know what to do if you find one in your home,” head reptile and spider keeper Jake Meney said.
“An increase of funnel-web activity in homes means there’s a higher risk of getting bitten and needing antivenom.”
The ARP is the only supplier of funnel-web venom that is made into antivenom for bites and relies on donations to keep the program going.
They’ve asked for any collected spiders to be brought to the park or a participating drop off locations.
While funnel-web spider bites are potentially deadly to humans, there has not been a single death since the park’s program began in the early 1980s.
How to identify a funnel-web spider
They are also found in the drier open forests of the Western Slopes of the Great Dividing Range and South Australia’s Gulf ranges.
The Sydney funnel-web spider, the species likely responsible for the 13 deaths attributed to bites, is found from Newcastle to Nowra and west as far as Lithgow
They typically measure one to five centimetres in body length.
Males are more lightly built than females.
Body colour can vary from black to brown but the hard carapace covering the front part of the body is always glossy.
Funnel-webs prefer to live in more cluttered outdoor areas, such as in dense shrubberies or bushland, rather than lawns.
Their burrows – from which the spider derives its moniker – are lined with webs and silken “tripwires” radiate out from the mouth, allowing the spider to detect and ambush prey.