Officials reported 307 deaths were found in Kyber Pak Thongkwa province, where the mountainous areas were hit hardest by floods.
Nine people have been killed in Pakistan-controlled Kashmir and five have been killed in Gilgit-Baltistan, authorities said.
Most of the victims died from collapsed homes and sudden spikes in water, while 21 others were injured.
Rescue squads continue to search for survivors in the Banner district of Kyber Pakhtunkhwa, where cloudbursts and heavy rains have washed away dozens of homes, said Mohammad Suhail, a spokesman for Emergency Services.
The Weather Service issued new warnings and urged people to take precautions as more rainfalls were coming in the northwest.
Authorities also reported that at least 633 people died this week in northern Pakistan as a result of the floods, with 351 confirmed deaths in Khyber Pakhtunkhwa and Gilgit-Baltistan alone.
This impact is reflected across India-controlled Kashmir borders, where floods killed dozens and hundreds evacuated their homes.
Experts say sudden cloud bursts and intense downpours are becoming increasingly common in Pakistan and India’s Himalayas, and climate change is contributing to the increased frequency and severity of such disasters.
MNA/