Swarms might appear anytime between September and May depending on the season, area and conditions within the hive. They are clusters of Native honeybees called Arabian/Asian Dwarf Honeybee 'Apis florea', about the size of a football and may contain around 5,000 individual bees. The swarm can settle on a bush, tree, wall or even a bike. They can appear around noon on warm, dry and wind-free days.
Swarming is a natural occurrence and swarms are often good natured because they have just eaten lots of honey.

They shouldn’t present a risk as long as you don’t interfere with them, but don’t try to handle a swarm if you are not an experienced beekeeper.