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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.
Compared with Anchorage, the sea at Juneau in southeast Alaska doesn't get as cold in winter nor as warm in summer. Still, during July and August, the water there usually isn't much cooler than water at beaches much farther south. Average ocean temperature in Â°F. Anchorage.