Time: All hours of the day
Frequency: Every time
World name: Balmung
Character name: Miles Saintborough
NPC name: n/a
Monster name: Ramuh
Class/Level: White Mage / 50
Party or solo: Party
In-game time: Any time
Area and coordinates: The Black Shroud/The Striking Tree, whole area.
Steps:

1) Signed up for The Striking Tree (Hard) in the Duty Finder

2) When the instance begins, checking the weather during the fight against Ramuh displays Japanese text instead of English.