AUSTRALIAN internet users have been warned to expect a serious slowdown in internet speeds until at least mid-October.

Two typhoons have damaged a number of undersea cables between Hong Kong and Sydney, ITnews reports, which will cause problems here for several weeks.

Internet service providers iiNet and Internode today issued an alert to their customers advising of the damage.

The main cable breakage that will impact Australian customers occurred an estimated 54 kilometres off the coast of Hong Kong, it said.

“We have temporarily routed via the US and redirected peering while the issue is outstanding,” the advisory from the companies said.

“Our network partner is currently engaged with submarine teams for initiation of repair process.”

ITnews said wholesale operators had “received a tentative repair completion of 13th October 2017”.

“However these dates tend to change over time due to the nature of [subsea repairs],” wholesale operators said.

The two ISPs warned rerouting internet traffic via the US would result in slower speeds as well as “latency and pack loss problems”.

“This may result in web pages taking longer to load, as well as impact to time-sensitive activities such as online gaming,” they said.

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Hong Kong has copped two serious storms in recent weeks, both of which caused significant damage to subsea cables.

Typhoon Hato hit the Chinese island metropolis last week and was rated the strongest storm in five years.

It was followed closely by Typhoon Pakhar.