A man was rescued from the Tijuana River Valley near Dairy Mart Road.
The man became stuck on a small patch of ground around 10 p.m. Monday.
The man was not injured but he was taken to Scripps Chula Vista for possible hypothermia firefighters said.
The man may have been trying to cross the border illegally, but authorities have not confirmed that.
During a storm in November, another man was rescued from a storm drain near the border.
When San Diego County gets a considerable amount of rain, the U.S. Border Patrol opens up the gates to allow the free flow of water through the drainage tube.
U.S. Border Patrol agents say it's common to see an increase in border crossing attempts during storms.