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The latest attacks happened at about 3:45 a.m. Saturday on Piedmont Avenue near Channing Way, and at 11 p.m. on Dwight Way near College Avenue.
In both incidents, the suspect walked up to the victims from behind and reached up under their clothing to sexually assault them, police said.
Witnesses described the suspect as a white man in his 20s about 5 feet 10 inches tall, weighing 160 to 170 pounds with a medium build and dark, wavy hair.
He is believed to be responsible for 19 attacks in the South Campus area since September.
Police are asking for the community's help in catching the suspect. Anyone who can identify him or who has witnessed an attack is asked to call the Berkeley police sex crimes detail at (510) 981-5735.
Police are also encouraging victims to report attacks immediately to Berkeley police dispatch at (510) 981-5900, or from a cell phone at (510) 981-5911.
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