This plugin was designed for an RTS game so the settings present in this plugin are more suitable for top down games where the player doesn't need to look at the sky. This is because this plugin only offers day night cycle settings and there are no options for clouds or weather (yet). One more thing: This is designed with single player in mind and might not work as expected in a multiplayer environment (yet).
Agora Day Night plugin lets you quickly add day night cycle to your game. It also offers sun and moon along with skylight, sky atmosphere and height fog. Sun position is set using real world latitude, longitude and time zone with support for date and time. Helper functions are also included that gives you properly formatted time and date text to display on HUD.
NOTE: Mac is unsupported because of a compile error and since I don't own one, it will remain unsupported till I can afford one.