What's wrong with the iphone 6s interface not displaying the weather?

It should be that the weather switch is not turned on, or it is not turned on by default after the system is updated.

How to display the weather on the drop-down page:

Settings-> Edit-> Weather-> open

2. Why didn't it show:

The previous iphone system should be ios6 or below, while the iphone 6s uses ios9.

After using ios7, the weather notification is turned off by default, and the forecast for the next five days will not be displayed, only the weather of the day will be displayed.

So set-notify.

Enter, and then check whether "Today View" is open. If it is not open, it is set to the open state.