Q: How to set weather in lock screen in iOS 8 & iPhone 4s

Hey smfromindia,

The weather will show up in Notification Center at the lock screen. If you use a third party weather app, check to see if it is an option to show up in Notification Center by scrolling down in Notification Center and tap edit to see what shows up there. Take a look at the article below for more information. 

Understanding notifications on iPhone, iPad, and iPod touch

http://support.apple.com/en-us/HT201925

Take care,

-Norm G.