Normal
Layering MIGHT be an issue, but light layers. We did an early June cruise and saw temps in the 70's. Coldest we had was 50's and not very often. Only time we bundled up was late in the day as we approached the glacier, with a moderate cloud cover and rain. Some people had golf type jackets on. You could easily wear long sleeve t-shirt, sweather and light jacket and brave some fairly nasty weather.
