Nominations close at noon on June 11. Voting will open on July 16 and close at noon on August 7.
Huaki was elected in the 2022 local election alongside Moko Tauariki as Hamilton’s inaugural Kirikiriroa Māori ward councillors.
In a council statement, Huaki said it had been a privilege to represent the city as one of the first Māori ward councillors, but she needed to prioritise her health.
The byelection would be the city’s second in less than three months.
In February, a byelection was held to fill the seat left by former Hamilton city councillor Ryan Hamilton who was elected a member of Parliament in the October general election.
Tim Macindoe was sworn in as the new councillor on February 20.
Hamilton City Council said it understood the changes signalled to Māori ward legislation by the coalition Government would have no bearing on the byelection.