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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: June is peak grass pollen season in Portland. Morning hours typically have the highest counts.
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
Grass pollen is high at 120 grains/m³, but winds are light and air quality is decent. Take precautions — the safest hours are later in the day.
Pollen: Grass pollen is high today at 120 grains/m³.
Lower-risk hours: 10:00-11:00, 20:00
Weather
70°F
Sunny · 73% humidity · 9 mph wind
~5 grains/m³