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Gathering pollen, air quality, and weather data for you.
Gathering pollen, air quality, and weather data for you.
Pollen Level
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Air Quality
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Weather
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Portland's allergy season typically runs from March through October, with two distinct peaks. Tree pollen surges in spring, then ragweed takes over in late summer. Understanding these patterns helps residents of Portland, ME plan outdoor activities and manage symptoms.
Right now: August is when ragweed season begins in Portland. Counts can spike quickly after dry, windy days.
Spring
Mar – May
Oak, birch, and maple tree pollen peak. Highest risk in April–May.
Summer
May – Jul
Grass pollen dominates. Humid days can elevate mold spore counts.
Fall
Aug – Oct
Ragweed season. Second major peak for allergy sufferers.
Coastal breezes near Portland can provide temporary relief, but spring nor'easters often redistribute pollen across wide areas. PollenTracker monitors these daily shifts so you know when it's safe to head outside.
Open another nearby forecast without going back to the map.
CAUTION
Tree pollen is moderate, air quality is fair (AQI 54), humidity is high. Conditions are moderate — most people will be fine with basic precautions.
Pollen: Tree pollen risk is medium today; source reading: Google UPI 1/5 (Very Low).
Lower-risk hours: 08:00-09:00, 21:00
Weather
72°F
Sunny · 88% humidity · 7 mph wind
Google UPI 0/5