The firecrackers blasted as a many individuals had gathered to celebrate a nearby new year celebration. More than 200 were harmed.
A building at the temple then folded, inflicting several of the deaths.
Investigation team has been requested as authorities say permits for the display had been rejected after safety fears.
This major blast happened at around 03:30 (22:00 GMT Saturday), hours after the occasion began, in the beach front town of Paravur, in Kollam region.
Emergency teams were slow in reaching the area, witnesses said. Rescue teams utilized bulldozers to clear the area looking for survivors.
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