Police would like to speak to anyone who may have witnessed the assault or holds any information which may assist Police in identifying this offender.
"This was a brazen, opportunist assault and we are eager to resolve this offence for the sake of the victim, her family and in order to prevent any future incidents of this nature," Detective Claire Rogers said.
"I would like to take this is an opportunity to remind members of the public to report any suspicious people or concerning behaviour to the Police immediately."
Anyone with information relevant to this investigation is asked to contact Taupo Police on 07 3786060.
Alternatively information can be provided anonymously via Crimestoppers on 0800 555111.