Still nothing even after changing city to eg New York (i live outside of US). I've also tried to install 4.8.0 mod (with "clear all data" before uninstalling 4.8.1) but my band still show "connect to MiFit to update forecast".
Only way for me to sync weather forecast is to install Notify for miband, sync weather then delete/disable Notify for miband.
For me it worked by changing the units to F and back to C.
Had the same problem and before changing the measure units, I also changed the city to one closest, maybe that contributed too to solve the issue.