Yanfly Engine Plugins is a plugin library made for RPG Maker MV, a wonderful piece of software to help you make that role playing game of your dreams. You can find out more about RPG Maker MV here
You can grab the plugin here:
Weather does not appear in battles in RPG Maker MV by default. This causes a disconnect from entering a battle on a map with weather effects rolling in the background to a battle scene where the skies are suddenly devoid of such weather behavior. This plugin adds in the simple effect of making whatever weather that’s being played on the map also affect the weather played in battle. There’s also new functions to save weather settings and recall them for later in addition to a new action sequence for those using the Battle Engine Core plugin.
If you are using YEP_BattleEngineCore.js, place this plugin underneath it in the Plugin Manager’s plugin list.