Unzip using iFile and move to var/mobile/library/iWidgets.
To edit the weather widget you have to get your weather code from yahoo weather by using google. Go into the iWidget theme folder and select the widget.html document to open. Scroll down till you find the var locale and select edit at the top corner to change the weather code as seen in the screen shot below then save.
Unzip using iFile and place in var/mobile/library/iWidgets.
You need to go into the iWidget folder and set the weather code by selecting the Config.js document. Hit edit at the top corner. Scroll down till you see where to change the weather code as seen in the next screen shot then save.