You can use widgets on your Home Screen or you can use widgets from Today View by swiping right from the Home Screen or Lock Screen.
Add widgets to your Home Screen
- From the Home Screen, touch and hold a widget or an empty area until the apps jiggle.
- Tap the Add button
in the upper-left corner. - Select 1Weather widgets. Now swipe across the screen to chose from the list of widgets available, then tap Add Widget.
- Tap Done in the support-right corner
- .
You can also add widgets from Today View. From Today View, touch and hold a widget until the quick actions menu opens, then tap Edit Home Screen. Drag the widget to the right edge of the screen until it appears on the Home Screen, then tap Done.
Add widgets to Today View
- Touch and hold a widget or an empty area in Today View until the apps jiggle.
- Tap the Add button in the upper-left corner.
- Select 1Weather widgets. Now swipe across the screen to chose from the list of widgets available, then tap Add Widget.
- Tap Add Widget, then tap Done.
You can refer to this video from Apple Support- How to add widgets to the Home Screen on your iPhone — Apple Support