Jarett Bortscher, 18, has been missing since Sunday.Jarett Bortscher, 18, has been missing since Sunday. (YouTube)

A worried Edmonton family is asking for the public's help in locating their missing autistic son.

Jarrett Bortscher, 18, went for a walk around dinner time on Sunday and hasn't come home, his father told CBC News.

"We don't think he even had a jacket on," John Bortscher said, adding his son has been without his medication since he went missing. "It's very difficult because we don't know where he is. We miss him, our family loves him."

Jarrett Bortscher is 5 feet 4, with a medium build, dark blond hair and hazel eyes.

He was wearing dark sweat pants, blue runners and a light T-shirt when he left his home near 39th Avenue and 104th Street on Sunday.

Anyone who may have seen the missing teen is urged to call Edmonton police.