To properly recommend we need some information:
1) minimum temperature the bike engine starts at (you need thinner oil when cold). If you garage your bike in a heated garage you can use higher viscosity than someone leaving theirs in a car port. Where you live also comes into play.
2) maximum running temperature (sitting in traffic on hot days is usually the worst).
3) how hard you ride - are you racing (I ride like I am being chased by the police 90% of the time and never sit in traffic)
There are a few other factors, but those are the main ones.