Clear skies in Mist housing area/Limsa Lominsa. The white stone becomes so shiny and is a beautiful contrast to the vibrant blue sky
Heatwave in Southern Thanalan. Such an intense color! And makes the desert really feel like one
Odin's Weather in Southern Shroud is also pretty :3
Oh, and I absolutely love Snowstorms in the western Highlands and gentle snowfall at night in Lower Ishgard. Combined with the music, nearly makes me cry everytime...so desolate and cold and sad, but all the more worth it to reach an outpost or a warm inn room.