The same man could be responsible for sex attacks on two women in the West Australian Goldfields town of Leonora, 500 kilometres north-east of Perth.

A woman in her 40s was sexually assaulted outside her home between 12:30am and 1:30am on Monday, police said.

Her attacker is believed to be in his 20s, about 183cm tall, with dark skin and was wearing dark clothing.

Police say that a woman in her 70s was also sexually assaulted by a man of a similar description in her home in the early hours of Tuesday.

Any information should be reported to Crime Stoppers.