Philadelphia Pollen Forecast — Available Days
Daily values appear only when supplied by the data provider. A seasonal estimate is not a daily forecast.
Seasonal Allergen Guide for Philadelphia
General seasonal information; this list does not show which pollen is elevated today.
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Birch
Birch pollen is among the most allergenic of all tree pollens, triggering symptoms in up to 25% of allergy sufferers.
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Oak
Oak trees release enormous amounts of fine pollen — a leading cause of spring allergies across the us.
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Ragweed
One ragweed plant can produce a billion pollen grains per season, and wind carries it 400+ miles.
Pollen Count Philadelphia — What You Need to Know
The pollen count in Philadelphia peaks in April–September. Northeast allergy season runs April through October, with birch and oak leading in spring and ragweed peaking in fall.
Why Is Pollen High in Philadelphia?
The primary allergen is Birch — birch pollen is among the most allergenic of all tree pollens, triggering symptoms in up to 25% of allergy sufferers. Pollen spikes on warm, dry, and windy days. Rain temporarily clears the air, but counts rebound fast.
Pollen Season in Philadelphia
- Tree pollen — starts in early spring, peaks April–May. Birch, oak, and cedar are the biggest triggers.
- Grass pollen — peaks late spring through early summer. Affects over 40 million Americans.
- Ragweed — August through October. One plant releases a billion grains per season.
Frequently Asked Questions
What is the pollen count in Philadelphia today?
Check the data status above for Philadelphia. Provider forecast levels appear only when available. A seasonal estimate is not today's measured pollen count.
What type of pollen is high in Philadelphia right now?
The seasonal guide does not establish which pollen is high right now. Current plant-specific levels are not supplied by the seasonal estimate.
When is pollen season in Philadelphia?
Pollen season in Philadelphia typically peaks in April–September. Tree pollen starts in early spring, followed by grass pollen in late spring through summer, and ragweed from August through October.
What should I do when pollen is high in Philadelphia?
On high pollen days in Philadelphia: check the forecast before going outside, schedule outdoor activities for the afternoon (pollen peaks 5–10 AM), keep windows closed and use AC, take antihistamines before exposure rather than after symptoms start, and shower after spending time outdoors to remove pollen from skin and hair.
How accurate is the pollen forecast for Philadelphia?
Provider forecasts are estimates, not measurements at your address. When provider data is unavailable, this page may show a broad seasonal estimate. Missing daily forecasts remain blank; no accuracy guarantee is made.