A man, who had been drinking, slipped on rocks and fell into Stanley Park boating lake on Thursday evening, say fire services.
Firefighters, who were called to the incident at around 10pm, say the man became stuck in the lake after he became cold and was unable to move his legs.
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Crews from Blackpool used specialist lifting equipment to rescue the 38-year-old.
Crew Manager Mark Preddy said: "The man had been sitting on the embankment drinking with friends when he slipped and fell into the lake.
"He was unable to get himself out of the water. His legs went numb after he got cold.
"Once of his friends called us out to help. We used lifting equipment to get him out.
"Paramedics checked him over but he didn't need to go to hospital. Once he warmed up a bit the feeling returned to his legs and he was ok.
"We'd like to remind members of the public to take care near open water. Please keep safe and always obey any warning signs.
"Do not swim in water when it is not permitted."