Sirirat said he had instructed all district offices to monitor for possible flash floods and landslides.
Officials in at-risk districts have been ordered to warn the villagers he said.
He said the areas at highest risk are 30 villages in 7 tambon of Mae Sariang district, 15 villages in five tambon of Sop Moei district, 36 villages in 6 tambon of Khun Yuam district, and 27 villages in five tambon of Mae La Noi district.
If officials consider a landslide is imminent, they must evacuate villagers immediately, the governor said.