Rain and Humidity

Fireworks can be let off in the rain, but they must be sealed in containers that limit the amount of water that touches them. Wet fuses will not light.
Spectators may not like sitting in the rain.
Humid conditions occur when there is a lot of water vapor, or moisture in the air.
If the air is too humid, the colors of fireworks will be less bright and the fireworks may not light properly.