When do termites swarm?
Termites usually start to swarm in the early, often rainy days of spring when the weather is warm. They use environmental cues as a signal to start swarming and also synchronize with other termite colonies of the same species to reduce the possibility of inbreeding.
The time of day termite swarms occur depends on the species of termite. A majority of subterranean termites swarm during the day, while Formosan termites swarm at night.
Termites aren’t very good fliers, so termite swarms don’t last long. Termites generally rely on the wind to help carry them and thus don’t usually get far from the originating nests. Winged termites are particularly attracted to light sources, so they can often be found swarming around street lamps, windows, etc.