At approximately 3.30am on Sunday 14 July an 18-year-old woman was walking along Henderson Road when she was pushed to the floor and subjected to a serious sexual assault.
Following the attack the offender fled the scene in the direction of Cameron Road.
He is described as a white man, approximately 25 years old, of medium build and was wearing dark coloured clothes.
Detective Inspector Ian Whiley, from Widnes CID said: “The victim is traumatised following her ordeal and is currently being supported by specialist officers.
“I urge anyone who has any information which may assist with our enquiries to come forward.
“We want to speak to anyone who believes they may have witnessed something that is relevant to our investigation.”
Chief Inspector Simon Parsonage, from Widnes Local Poling unit said: “I would like to reassure the local community that incidents such as this are rare in the Widnes area and we are doing all that we can to establish exactly what has taken place."
Anyone who witnessed the incident or has any other information that may help detectives with their investigation is urged to call Cheshire Police on 101, quoting IML 455718, give the details via https://cheshire.police.uk/