read json data from weather api

I try to use json data from weather api. How to read this data from $obj.

dd($obj);

{#522 ▼
  +"coord": {#524 ▶}
  +"weather": array:1 [▼
    0 => {#509 ▼
      +"id": 300
      +"main": "Drizzle"
      +"description": "light intensity drizzle"
      +"icon": "09d"
    }
  ]
  +"base": "stations"
  +"main": {#518 ▶}
  +"visibility": 10000
  +"wind": {#512 ▶}
  +"clouds": {#511 ▶}
  +"dt": 1485789600
  +"sys": {#508 ▶}
  +"id": 2643743
  +"name": "London"
  +"cod": 200
}