Sandstorm (Japanese: 砂あらしSandstorm) is a type of weather introduced in battle in Generation II. It was introduced in the overworld in Generation III.
It will last for five turns if created using Sand Stream (Generation VI onwards) or Sandstorm, or eight if created while holding a Smooth Rock. If created using Sand Stream (prior to Generation VI) or encountered in the overworld, it will last until replaced.
Sand is whipped around by wind, making it difficult to see. Found in Hoenn on Route 111, in Sinnoh on Route 228, and in Unova inside the Desert Resort.
Light
Several sand particles are whipped diagonally across the screen. In Generation V, it is found on Route 4BWW2 and at the entrance to the Desert ResortBWB2W2.
Windstorm
This variation does not create sandstorm weather in battles where it occurs, but the overworld effect resembles a sandstorm. Found in Kalos on Route 13, bits of dust and debris are blown around by a strong wind from the west. Occasionally the wind abates, but whenever it is blowing, it hinders the player's movement westward.