Any weather can be great for touring! It is a good idea to know in advance what the weather will be so you can plan accordingly. About a week before your departure, you can begin to see reliable forecasts for the cities and regions you will visit. Check those forecasts online or in an international newspaper and plan for the specific weather you are likely to encounter.
"Wherever you go, no matter what the weather, always bring your own sunshine." -Anthony J. D'Angelo