It is not uncommon for people to become a little worried upon seeing a swarm of bees – it’s not something you see every day! It’s important to remember that this is completely natural, and if you leave them all — they’ll leave you alone.
Swarming is the process by which a new honey bee colony is formed when the queen bee leaves the colony with a large group of worker bees. In the prime swarm, about 60% of the worker bees leave the original hive location with the old queen. This swarm can contain thousands to tens of thousands of bees.
When bees are swarming, their primary concern is finding a new home as soon as possible and ensuring the survival of the queen and the colony. They’re really not interested in you at all. (Of course, if you attempt to disrupt them, they’re not going to be too happy about it!)