Summary:
Weather icon shows the “Water! Water from the sky!” entry (lol) and I hear the sound effect, but there is no visual. Have saved / quit / reloaded a couple of times. Save file attached.
Version Number and Mods in use:
No mods. Latest Alpha steam channel, 0.24.0 r843 x64
Same happened to me. Both qualities had invisible rain.
Was it in the first day too? I was just testing things restarting all the time, it happened when I started and rainy was the first weather.