Good morning Nathalie. We went in Norvegian fjords just two months ago, between 7 and 14 june. So that the weather was medium cold, the temperatures were about 7 / 15 grades Celsius (44 / 59 Farenheit), and the clothes I suggest you are: sweather, sweatshirt, more better and hoodie, and a light scarf (foulard) to cover the neck. You can wear quietly a jeans, even a bermuda shorts inside the ship, because it's warm by right air conditioning. At the end it's necessary to put in suitecase an umbrella and a jacket, because on top of Hellesyt fjiord was snowing. Good trip and cheers