Hot and humid conditions have settled into Maine, resulting in Heat Advisories and Air Quality warnings.

The National Weather Service is warning of another big return of hot and humid conditions throughout Maine. Thursday and Friday will be downright miserable, with heat index values at 100 degrees for the Bangor area. A heat advisory is in effect for much of the state. According to the NWS, "heat index" is defined as "what the temperature feels like to the human body when relative humidity is combined with the air temperature." The overnight hours Thursday won't bring much relief from the heat, as lows are forecast above 70 degrees.

Maine Department of Environmental Protection has issued an air quality alert for coastal Hancock county, especially Acadia National Park. Wildfire smoke from out west, combined with higher ozone levels could cause medical issues for the elderly, teenagers, children, and those with heart or lung disease, or asthma.

In addition to the heat and humidity, thunderstorms are possible through Saturday. Some storms could produce isolated heavy rainfall.

The Maine CDC recommends those without air conditioners to keep windows and blinds closed on the side of your home with the most sun, and open on the shady side. At night, open all windows and run fans to let the cool air in, and hot air out. For more tips to avoid heat-related illness, visit

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