Low
Pollen is low — most people won't notice
Weed pollen is the main trigger · Tomorrow → · Updated 13 hours ago
Today in Chicago: weed pollen is low, tree pollen is very low, grass pollen is none. Overall score: 18/100. Allergies are unlikely for most people right now. Tomorrow is expected to be about the same. Updated at 1:00 AM.
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Pollen levels in Chicago are currently low. Most people should not experience allergy symptoms from pollen.
Tree pollen: Very Low. Grass pollen: None. Weed pollen: Low.
Tomorrow's pollen forecast for Chicago is expected to be about the same, with low pollen conditions.
Weed pollen is the highest supported pollen type in Chicago today. Weed pollen is low.
Tree pollen in Chicago is very low today.
Grass pollen in Chicago is none today.
Weed pollen in Chicago is low today.
Tomorrow's pollen forecast for Chicago is expected to be about the same, with low pollen conditions.
The allergy forecast in Chicago is low today based on the supported tree, grass, and weed pollen data shown on this page.
Chicago's position along Lake Michigan and its humid continental climate create a prolonged and varied allergy season, with sufferers often contending with overlapping triggers from early spring through late fall.
Tree pollen kicks things off in March and typically peaks in April and May, driven by oak, maple, birch, elm, ash, cottonwood, and mulberry—species that thrive throughout the city's parks and neighborhoods. As tree counts taper, grass pollen takes over from late May through July, with Kentucky bluegrass, timothy, orchard grass, and ryegrass acting as the dominant offenders across the region's lawns and prairies.
The transition between late tree season and early grass season often produces a brief but intense overlap that can worsen symptoms in June.
Weed pollen dominates from August through the first hard frost in October, with ragweed as the primary culprit, supported by lamb's quarters, pigweed, and sagebrush.
Beyond pollen, Chicago's lake-influenced humidity fuels persistent outdoor and indoor mold, particularly in late summer and fall, while dense urban traffic and industrial activity contribute to elevated particulate pollution that can amplify respiratory irritation.
Overall, Chicago's allergy profile is defined by a long, multi-phase pollen calendar intensified by Midwestern humidity, lakefront mold, and urban air quality concerns.