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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.
The average temperature throughout June is 23Â°C (73Â°F). Average highs rise to 27Â°C (81Â°F) which are mostly experienced in the beginning of the month with the rest of the month seeing daily highs get all the way to 31Â°C (87Â°F). Average lows go down to 18Â°C (64Â°F) which are mostly seen in the middle of the month.