Question: I'm traveling to Alaska in May and am wondering how warm it will be?
Answer: Because of Alaska's vast size, the answer is "It Depends!" May in Ketchikan (rainy) is different from May in Barrow (chance of snow).
The Alaska Climate Research Center, part of the Geophysical Institute of the University of Alaska, Fairbanks, has a climate page with good information about specific conditions in different parts of the state. That page is at http://akclimate.org/weather/tourist/information.html.
If you know which towns in Alaska you'll be visiting, check out Alaska Community Database from our Department of Commerce, Community and Economic Development. The community profiles include information about climate as well has local history and demographics.