The answer to 'why is my termite swarms' is that termite swarms are a sign of an active termite infestation in or around your home. Termites swarm, or release winged reproductive termites, in order to establish new colonies. Seeing termites swarming around your home is an indication that you likely have an existing termite problem that needs to be addressed.
Termite swarms typically occur in the spring or fall when the weather is warm and humid. They are attracted to light and may be seen coming out of cracks or openings in the wood, walls, or foundation of your home. Swarming termites are a sign that there is a mature termite colony nearby that has reached a point where it needs to expand and reproduce.