Managing your City list
From the Weather app, tap the Menu icon 
(at the upper-right corner of
the screen) > Settings > Edit city
list.
NOTE
You can also access your City list by tapping the City list icon 
(at the top of the Weather app screen).
Tap the Add icon
(at the upper-right corner of
the screen) to add another city.Tap the Delete icon
(at the top right of the screen)
to delete a city from your list.Touch and drag the handle icon
(on the right side of the screen) to move a city to a new
position in your city list. This affects the order viewed when you
swipe (vertically in the Weather widget and horizontally in the Weather
app) through your cities.