Philadelphia, PA Ragweed Pollen
Ragweed pollen in Philadelphia usually peaks around September, reaching Very High at its worst. Philadelphia's allergy year opens with an early tree season and ends with a long ragweed fall: maple and birch in spring, grass through early summer, and ragweed from late summer into October.
Ragweed peaks in September across the region's fields and roadsides.
Ragweed in Philadelphia today
Monday, July 27, 2026
Ragweed pollen by month in Philadelphia
How ragweed usually runs across the year. The current month is outlined.
Managing ragweed season in Philadelphia
If ragweed is your trigger, start a daily antihistamine like cetirizine (Zyrtec) or loratadine (Claritin) a week or two before the September peak, rather than waiting for symptoms. Keep windows closed on high-count mornings, shower and change clothes after time outside, and run the AC on recirculate in the car.
When symptoms don't ease with over-the-counter medicine, an allergist in Pennsylvania can test whether ragweed is really what you react to and talk through longer-term options like allergy shots.
Sources
More pollen in Philadelphia
- Philadelphia birch pollen — peaks April.
- Philadelphia grass pollen — peaks June.
- Philadelphia oak pollen — peaks April.
- Philadelphia maple pollen — peaks March to April.
- Philadelphia pollen calendar — every allergen, month by month.
- Philadelphia pollen count today — live tree, grass, and weed levels with a 5-day forecast.
- Pennsylvania pollen season — the statewide calendar and other cities.
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Sign up for free alertsSeasonal pattern based on Pennsylvania pollen data and local sources. Today's reading updated daily. MyPollenPal