By any measure, the numbers are unusual. Alaska had its warmest March on record — in some places 20 degrees above normal. Once all the data is tabulated, it is likely to be the second-warmest June on record.

The highest temperature ever recorded at Anchorage’s official station was 85 degrees, while other stations in the area have gone a couple of degrees higher. Bob Clay, a meteorologist with the National Weather Service, said forecasters expected a high-pressure system to push temperatures well into the 80s starting on Thursday and potentially reach the 90-degree threshold in parts of the Anchorage area on Friday, Saturday or Sunday.

While the weather has disrupted fireworks plans, Anchorage will still proceed with a Fourth of July pancake breakfast, a community parade and a festival with food vendors. A local Reddit thread was advising overheated residents to put jugs of ice in front of their fans, though a second thread warned those who didn’t already have a fan: “They are sold out everywhere. EVERYWHERE!”

Anchorage has now had 34 days in a row of above-average temperatures — “an exceptional run,” said Brian Brettschneider, a climatologist at the International Arctic Research Center. In Kotzebue, on the shores of northwestern Alaska, that above-average trend has extended for 105 days.

Alaska is experiencing many of the effects of a heating planet, as the nation’s fastest-warming state, according to the Fourth National Climate Assessment. The state’s temperatures are rising at twice the global average rate, with spring temperatures averaging about two to five degrees warmer than those of half a century ago.