A 13-year-old boy is accused of attacking women in Cairns this week, including a mother who was walking down the street with her child.

A boy aged 13 has been charged with attacks against women in far north Queensland, including two sexual assaults.

Officers say the teen inappropriately grabbed a woman in her 40s and a 16-year-old girl in separate incidents in the Cairns suburb of Manoora this week.

He also allegedly threatened a woman in her 30s with an umbrella, and grabbed and punched a mother as she walked down the street with her child.

He has been charged with two counts of sexual assault and one count each of assault occasioning bodily harm and common assault.

The teenager will be dealt with under the Youth Justice Act.