How output nested object value

Check objects by clicking on this link

http://api.openweathermap.org/data/2.5/forecast?id=524901&APPID=e8780420f8d0a3cf13e80ff3ad27cf96

Example of my ReactJS code

https://codeshare.io/5vgPrn

I want to get the main child object value, but cannot get access to that. So what should I do to make this work?