Alaska's weather can change with a moment's notice. The last time I was there was last June. All but one day (in port) we had to layer our clothes to stay warm. The days that we were viewing the glaciers, we needed hats, gloves, scarves, heavy coats. One of my tricks is to wear silk "longjohns". I am very cold-natured, but hate to wear alot of bulky clothes. It's no fun to end up lugging around a heavy coat if the temp warms up. So, I usually opt for the longjohn top, a pullover thin sweater & a waterproof/wind -resistant jacket or sweatshirt for days in port. If you are going whale watching - be sure to dress warmly. Alaska is my favorite destination! Have a ball!!