Temperatures in the 90s and high humidity are expected to keep interior southern Maine oppressively hot for the next few days, but coastal areas could escape the worst if sea breezes kick in.

The National Weather Service office in Gray said the hot weather could continue through midweek, and it’s possible heat advisories will be issued on Sunday and Monday warning people to take measures to stay cool. Heat advisories are issued when temperatures exceed 95 degrees, said meteorologist James Brown.

“We are considering them for tomorrow,” Brown said Saturday.

The heat won’t move into northern Maine until Monday, while Washington County could also duck the worst initially thanks to sea breezes, according to the National Weather Service office in Caribou.

Brown said the heat will be worst in interior southern New Hampshire, where five days of 95- to 100-degree temperatures are expected.

In Maine, coastal areas could see temperatures in the mid-80s if breezes off the ocean, now about 60 degrees, are able to overpower lighter winds from the west. But if they do not develop, the coast will feel just as oppressively hot as the interior. Temperature will dip into the mid-60s at night in southern Maine.

Temperatures could remain hot and humid right through July Fourth and beyond, according to the weather service. Thunderstorms may develop in the afternoons as the heat stretch continues.

Brown said the last time it was this hot in the Gray forecast area was in 2013, when Concord, New Hampshire, saw a run of five days above 90. He did not have similar statistics for Greater Portland.

The heat could break records when it moves into northern Maine on Monday, said Victor Nouhan, a meteorologist at the weather service office in Caribou.

“We may issue a heat advisory, which is rare,” Nouhan said Saturday.

He said even Down East Maine could be in the 90s by Wednesday and Thursday. He said it will be unusually hot in northern Maine.

“In Caribou we average 1.5 days a summer when it gets into the 90s. I could see maybe three, maybe four days in a row – which would be very rare,” he said.

In Portland, record highs in the first week of July include 93 degrees on July 1, 1971; 98 degrees on July 2, 1941; 95 degrees on July 3, 2002; 90 degrees on July 4, 2010; and 94 degrees July 5, 1999.

“It is not all that uncommon for something like this to happen in July and August. That is our time for heat,” said Brown.