Paper/paper-server/patches/sources/net/minecraft/server/commands/WeatherCommand.java.patch

--- a/net/minecraft/server/commands/WeatherCommand.java
+++ b/net/minecraft/server/commands/WeatherCommand.java
@@ -34,11 +34,11 @@
     }
 
     private static int getDuration(CommandSourceStack source, int duration, IntProvider provider) {
-        return duration == -1 ? provider.sample(source.getServer().overworld().getRandom()) : duration;
+        return duration == -1 ? provider.sample(source.getLevel().getRandom()) : duration; // CraftBukkit - SPIGOT-7680: per-world
     }
 
     private static int setClear(CommandSourceStack source, int duration) {
-        source.getServer().overworld().setWeatherParameters(WeatherCommand.getDuration(source, duration, ServerLevel.RAIN_DELAY), 0, false, false);
+        source.getLevel().setWeatherParameters(WeatherCommand.getDuration(source, duration, ServerLevel.RAIN_DELAY), 0, false, false); // CraftBukkit - SPIGOT-7680: per-world
         source.sendSuccess(() -> {
             return Component.translatable("commands.weather.set.clear");
         }, true);
@@ -46,7 +46,7 @@
     }
 
     private static int setRain(CommandSourceStack source, int duration) {
-        source.getServer().overworld().setWeatherParameters(0, WeatherCommand.getDuration(source, duration, ServerLevel.RAIN_DURATION), true, false);
+        source.getLevel().setWeatherParameters(0, WeatherCommand.getDuration(source, duration, ServerLevel.RAIN_DURATION), true, false); // CraftBukkit - SPIGOT-7680: per-world
         source.sendSuccess(() -> {
             return Component.translatable("commands.weather.set.rain");
         }, true);
@@ -54,7 +54,7 @@
     }
 
     private static int setThunder(CommandSourceStack source, int duration) {
-        source.getServer().overworld().setWeatherParameters(0, WeatherCommand.getDuration(source, duration, ServerLevel.THUNDER_DURATION), true, true);
+        source.getLevel().setWeatherParameters(0, WeatherCommand.getDuration(source, duration, ServerLevel.THUNDER_DURATION), true, true); // CraftBukkit - SPIGOT-7680: per-world
         source.sendSuccess(() -> {
             return Component.translatable("commands.weather.set.thunder");
         }, true);