(CNN) Alaska's heat wave continued through Independence Day, and in Anchorage, the temperatures shattered an all-time record.

The temperature at the airport was 90 degrees Thursday, besting June 14, 1969, for the highest mark ever recorded in the city, according to the National Weather Service.

Across south Alaska, the mercury was expected to rise to record or near-record levels on the nation's 243rd birthday and continue at above-average levels through next week, the National Weather Service reports

Last month was the warmest June on record, with an average temperature of 60.5 degrees -- 5.3 above average, according to the National Weather Service Anchorage, whose records for this location date to 1954 (66 total Junes). June marks the 16th consecutive month in which average temperatures ranged above normal.

"All 30 days in June had above average temperatures," the service noted.