Low
Pollen is low — most people won't notice
Grass pollen is the main trigger · Tomorrow → · Updated 13 hours ago
Today in Philadelphia: grass pollen is very low, tree pollen is none, weed pollen is none. Overall score: 6/100. Allergies are unlikely for most people right now. Tomorrow is expected to be about the same. Updated at 2:01 AM.
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Pollen levels in Philadelphia are currently low. Most people should not experience allergy symptoms from pollen.
Tree pollen: None. Grass pollen: Very Low. Weed pollen: None.
Tomorrow's pollen forecast for Philadelphia is expected to be about the same, with low pollen conditions.
Grass pollen is the highest supported pollen type in Philadelphia today. Grass pollen is very low.
Tree pollen in Philadelphia is none today.
Grass pollen in Philadelphia is very low today.
Weed pollen in Philadelphia is none today.
Tomorrow's pollen forecast for Philadelphia is expected to be about the same, with low pollen conditions.
The allergy forecast in Philadelphia is low today based on the supported tree, grass, and weed pollen data shown on this page.
Philadelphia sits in a humid continental climate zone within the Mid-Atlantic's dense deciduous forest belt, giving the city a long and intense allergy calendar that typically runs from March through October.
Tree pollen kicks things off in early spring, with oak, maple, birch, sycamore, cedar, and London plane—heavily planted along Philadelphia's streets and parks—driving peak counts from late March through May. As tree season winds down, grass pollen takes over from mid-May through July, dominated by timothy, Kentucky bluegrass, orchard grass, and perennial ryegrass common across the region's lawns and suburban corridors. There is often a two- to three-week overlap in May and early June when lingering tree pollen and rising grass counts can compound symptoms significantly.
Weed season follows in August and peaks in September, led by ragweed, which thrives in the Delaware Valley, alongside lamb's quarters, pigweed, and plantain.
Beyond pollen, Philadelphia's humidity fuels year-round outdoor and indoor mold (especially Alternaria and Cladosporium), while dust mites, cockroach allergens in older row-home housing stock, and elevated urban air pollution and ozone add to the burden.
Overall, Philadelphia's allergy profile is defined by a long, overlapping three-season pollen cycle intensified by humidity-driven mold and urban air quality issues.