Ghost of Tsushima features a dynamic weather system that occurs in real-time as Jin Sakai is working to save his homeland from the invading Mongols. However, it has been revealed that more storms will occur as Jin goes deeper down the Ghost path.
Speaking to Gamespot, Ghost of Tsushima creative director Nate Fox explained that, "The game is definitely scripted to provide more storms as you do things which are extremely Ghost driven."
Jin Sakai begins his journey as an honorable samurai, but to defeat his enemies that threaten his home, he must walk a more dishonorable path by using stealth and striking from the shadows.
Mongols faced early on are meant to be taken down by using the skills of a samurai, but Ghost of Tsushima gradually unlocks Ghost skills for you as the difficulty ramps up and naturally encourages players to embrace this different way.
The weather follows Jin's journey, and begins much calmer. Yet, if the player chooses to utilize the Ghost path more as the game progresses, the storms become more frequent and areas will become a bit darker, which runs in parallel to Jin's evolution.
It's important to remember that players can choose to change the weather at any point with their flute, but this is a nice touch to a game that doesn't feature a traditional morality meter.
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Honestly that's another thing they should do and take from RD2 with how the environment can affect you if it's too extreme.