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National Weather Service records indicate that the high temperature in Juneau on June First averages 59 degrees and the high on the last day of the month averages 63 degrees.ational Weather Service historical Juneau June Weather data indicates that on June 3, 1972, the recorded high did not exceed 45 degrees Fahrenheit, the lowest high measured in Juneau in the past 66 years.
Juneau weather essentials. Juneau, as with all of Alaska, experiences winters that are long, cold, and dark. The area's first snowfall often arrives sometime in October, with the Arctic chill often lingering into late May. Fortunately however, because of its latitude, Juneau also enjoys gorgeous, long summer days, the sun barely setting throughout the months of June and July. Although most visitors do choose to come to Juneau in the summer, the best time to visit largely depends on the visitors themselves and what type of experience they are looking for.