Equipment: ball made of anything that is kickable.
Weather: any weather, but best if it is warm.
Soccer is a game where player chace a ball to kick it in a specific place.
Thinking like that it is not a very smart thing to do, but pretty much any sport is like that.
However, soccer is a very active game, so it is not borring to play neather to watch. It is also a very graceful game.
Rarelly you will leave the place without seeing at least one awesome move from one of the players.