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US AQI

39Now
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396 AM
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379 AM
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4312 PM
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433 PM
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436 PM
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419 PM
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3712 AM
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Air quality outlook

Worst hour each day

Today43Good
Sat 1043Good
Sun 11500Hazardous
Mon 1247Good
Tue 1335Good

From our air-quality forecast models (GEOS-CF / GEFS aerosols). AQI uses the US EPA scale.

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About Portland weather

Portland is in Cumberland County, Maine, United States at 43.66°, -70.26°. Right now it’s 54° and mostly clear; today’s high is 61° with a 2% chance of rain.

Maine has a humid continental climate with cold, snowy winters and warm summers that are shorter than most of the eastern United States. The state's northern location and extensive coastline create significant weather variations between the interior and the coast. Caribou, in northern Maine, has recorded temperatures as low as minus 50 degrees Fahrenheit.