请告诉我下周星期三的天气情况，并输出为JSON格式的回答。
user
```json
{
  "date": "2023-10-18",
  "day_of_week": "Wednesday",
  "weather": {
    "description": "多云",
    "temperature": {
      "high": 22,
      "low": 15
    },
    "precipitation": {
      "probability": 0.2,
      "type": "rain"
    },
    "wind": {
      "speed": "5 km/h",
      "direction": "北"
    }
  }
}
```
assistant