I have the S5 and the weather on the lockscreen never updates. I have tried everything. Brought it back to the store, was there for 1 1/2 hours, we ended up resetting the phone to factory settings. It worked for 1 day.
Again the weather doesnt update. I take out the battery and the weather disappears and will show up a day or so later, but the weather for some reason is stuck at 91.