The assault took place in Carlton Road (A60), close to the Ashley Hotel, between Mount Avenue and Baulk Lane, at around 10.30pm to 11pm.
The victim required hospital treatment for a facial injury.
The offender is described as white, aged around 25 and 26-years-old, of very slim build and with blonde hair.
If you witnessed the incident, know the offender or have any other information which can help, please call 101, quoting incident number 485 of June 25.
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Alternatively, you can call Crimestoppers anonymously on 0800 555 111.