The public is being advised to check roofs and sheds during bee swarming season.
Swarming season is generally from the end of spring until late summer.
University of Galway Zoology Professor and beekeeper Grace McCormack said swarming happens when a queen bee leaves a nest to allow a developing queen to take over, allowing the nest to reproduce.
Speaking on RTÉ's News at One, Prof McCormack said: "So the (original) queen will take around half of the bees that are in a colony and they will go off to find a new nest. And they leave behind a developing queen to continue the original nest."
She said that due to the current hot weather, bees "are ready" to swarm.
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Prof McCormack said that the public should "keep an eye" on their property as bees might use the walls or roof spaces to form a nest.
She said that if a person sees about five to 20 bees near their roof, they should contact a beekeeper or a beekeeping club.
"That's because the scouts are deciding if that is a good place to go. You still have time before the swarm arrives, and that is really the best time to act," she said.
Prof McCormack said a swarm could be made up of thousands of bees.
She said that a person can deter bees from nesting in a chimney by lighting a fire, and also said that spraying deodorant or hairspray deters bees from nesting in an area.
Prof McCormack added that once a queen gets into a space, bees become "persistent" and it is difficult to remove them, especially in roofs or wall cavities.
She added that bees in Ireland are "docile" and not aggressive.
Prof McCormack added the public should "not be afraid" of swarms and that "it is wonderful to watch them".
