This is a paid asset, but now you can download 2d Weather Effects Free.
Detail this asset from Unity Store: Original Link
2d Weather Effects v2.21 (Latest version)
“If possible, please buy the package to support the developer”
Documentation is HERE
Standard RP Sprite Support
URP Sprite Support (new 2d light system and 2d renderer data)
LWRP Post Effect Support (sprite will NOT be supported for LWRP)
Full package also including this shader is HERE:
Full screen image effects and sprite support for your 2d games.
You can add mist, fog, storm, sand-storm, smoke, snow, rain effects to your 2d games very easily.
Just play with color, size, speed (direction) or density (etc) values to create your effects.
Models which are used in videos or screenshots ARE NOT INCLUDED in package!