Good weather mods?
If you are looking for something light,
Enhanced Weather is the way to go. It allows for easy customization of things such as night luminance, seasonal weather, and timescaled weather, as well as a nice weather control system and several new weather themes.
If you want to go all the way (like me) you'll want
All Natural. This mod combines all of the weather themes from three major weather mods (Natural Environments, Enhanced Weather, and Atmospheric Weather System) and unites them under a single robust weather control script (probably the best available). It also come with:
-Night luminance customisation
-Moon luminance customisation (this is the only mod that does this, too!)
-Fog range customisation (good for people who have reduced their DistantLOD draw distances, replaces Streamline's StreamSight feature)
-Natural Interiors (look out of windows and see the weather outside, currently in progress: special particle effects so you can see the rain and snow, as well)
-Real Lights (Gets rid of the ambient lighting in interior cells and realistically lights them, adding great new character to the game's interiors)
Take note that these mods only support HDR lighting. They should not be used with Bloom or Normal (static) lighting.
EDIT: I'm sorry I'm not watching the vids at this time, but I, too have The Lost Spires installed and I don't want to spoil anything for myself.