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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 Basics. Juneau, the capital of Alaska and the second largest city in the state, is located on the Gastineau Channel, less than 100 miles from the US-Canadian border. The borough and city of Juneau is the second-largest in the United States by area--larger even than the state of Delaware.epending on the location in the city and borough, average annual rainfall ranges from 55 inches to over 90 inches, and the average annual snowfall at Juneau International Airport is 93 inches. June and July are the driest months, with an average of 16 days of rain.