This is a searchable and updated list of Witcher 3 weather codes. These codes are used with the command ChangeWeather, which will change the weather.
Clear
Spiral Aen Elle
Spiral Dark Valley
Spiral Desert
Spiral Eternal Cold
Winter Epilog
Battle
Battle Forest
Blizzard
Clear
Heavy Clouds
Heavy Clouds Dark
Lessun Forest
Light Clouds
Light Rain
Light Snow
Mid Clouds
Mid Clouds Dark
Mid Clouds Fog
Q501 Blizzard
Q501 Blizzard 2
Q501 Fight Ship 18 00
Q501 Storm
Q501 Storm Arena
Rain Storm
Snow
Vesemir Burial Hour 3 30
Wild Hunt