Specialist officers from Dyfed-Powys Police, along with others from other forces, have been searching the area in and around Machynlleth since the beginning of October.
The force says the search areas identified during the course of the investigation were completed on Friday.
47-year-old Mark Bridger has been charged with murder, abduction and intending to pervert the course of justice.
He denies all the charges.
More top news
Any showers will ease through the evening to leave a mainly dry night with clear spells and light winds.
A coroner says that the family of a 15-year-old girl, who died after falling from a bridge, was let down by health authorities.
A chihuahua has been rescued after spending five days trapped down a hole on a Cwmtillery mountain.