Maine Weather Alert: Gradual Warming Brings Upper 80s by Thursday, Heat Index Nears 90 by Sunday

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Caribou, Maine – A tranquil, sunny Wednesday is underway across Maine, with seasonable highs pushing toward 80 degrees in most areas. According to the National Weather Service in Caribou, residents can expect cool, moonlit conditions overnight, with river valley fog developing as lows dip into the upper 40s to low 50s.

Thursday brings more sun and a gradual warming trend, with inland highs climbing into the low 80s. Dry weather will dominate through late week, giving farmers and travelers clear roads and calm skies. However, Mainers should prepare for a major shift by early next week as a hot, humid air mass arrives. The NWS warns heat indices could top 90 degrees in some inland locations from Sunday through Tuesday, pushing outdoor work and recreation into the caution zone.

Residents in places like Bangor, Presque Isle, and Millinocket should limit strenuous activities during the hottest periods, stay hydrated, and check on vulnerable neighbors. Expect more updates as heat advisories could be issued if conditions worsen.

Five Day Forecast for Caribou, Maine:

  • Wednesday: Sunny, highs near 78–80°F, calm winds
  • Tonight: Clear, patchy fog, lows 48–52°F
  • Thursday: Mostly sunny, highs 81–83°F
  • Friday–Saturday: Continued dry, warming, highs mid-80s
  • Sunday–Tuesday: Hot and humid, heat index 88–92°F, lows mid-60s