Question: How did Riddick know the rain would bring the monsters?
Gavin Jackson
19th Jan 2014
Riddick (2013)
Answer: Earlier in the movie, they show a pack of the dog-like creatures growling at the creatures in the water. When the rain is visible, his pet starts to growl towards that direction.
Answer: Earlier in the film when he arrived at the base, he could see the monsters from a distance when the rain came in. That's how he knew.
Gavin Jackson