I've tested this mod with chocapic's shader packs and none of the particles are visible.

I would guess this is a conflict with your custom shaders.

Can this be fixed?

Я тестировал этот мод с шейдерными пакетами chocapic, и ни одна из частиц не была видна.

Я бы предположил, что это конфликт с вашими пользовательскими шейдерами.

Можно ли это исправить?

I tested almost all the available shaders and found that the Triliton V6/V7/V8 shaders are perfect for playing with Weather2!
https://johanfossum.wixsite.com/trilitons-shaders

Here are screenshots of the day and night:

Minecraft 1.12.2
Triliton V6 Shaders
/weather2 storm create F4
/weather thunder

It's slightly too late =)
But i say that problem with SEUS shaders, not chokapic, so it doesn't help

Was going to just make an issue on this. I'd love to see shaders + this mod, since it looks beautiful.

SEUS shaderpack also have this problem
1.12.2 game version

Nope, the cloud is visable, but it's very buggy.
Happens w/ SEUS shader v11

#239

SEUS Renewed make weather particles invisible, only in nights can see small area with particles