Low
Pollen is low — most people won't notice
Multiple pollen types are active · Tomorrow ↑ · Updated 15 hours ago
Today in Cleveland: tree pollen is very low, grass pollen is none, weed pollen is very low. Overall score: 14/100. Allergies are unlikely for most people right now. Multiple pollen types are active. Tomorrow is expected to be much higher. Updated at 2:00 AM.
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Pollen levels in Cleveland are currently low. Most people should not experience allergy symptoms from pollen.
Tree pollen: Very Low. Grass pollen: None. Weed pollen: Very Low.
Tomorrow's pollen forecast for Cleveland is expected to be higher, with mild pollen conditions.
Multiple pollen types are active in Cleveland today, so no single supported allergen is clearly highest.
Tree pollen in Cleveland is very low today.
Grass pollen in Cleveland is none today.
Weed pollen in Cleveland is very low today.
Tomorrow's pollen forecast for Cleveland is expected to be higher, with mild pollen conditions.
Cleveland's position along Lake Erie in the humid continental climate zone creates a long, intense allergy season shaped by lake-effect moisture, cold winters, and warm, muggy summers.
Tree pollen kicks off allergy season in late March and typically peaks from mid-April through May, with oak, maple, birch, ash, sycamore, elm, and cedar driving the heaviest counts across Northeast Ohio's wooded neighborhoods and suburban corridors.
As tree pollen tapers, grass pollen surges from late May into July, dominated by timothy, Kentucky bluegrass, orchard grass, and ryegrass—all widespread in the region's lawns, parks, and Metroparks reservations.
Because late-season tree pollen often overlaps with early grass release in June, many Clevelanders experience compounded symptoms during this window.
Weed pollen takes over in August and peaks in September, led by ragweed, along with pigweed, lamb's quarters, and plantain, with counts often lingering until the first hard frost in October.
Beyond pollen, Cleveland's lake-driven humidity fuels persistent outdoor and indoor mold—especially Alternaria and Cladosporium—while older housing stock contributes to dust mite exposure, and urban air pollution and industrial particulates can intensify reactions.
Overall, Cleveland's allergy profile is defined by a prolonged, layered pollen calendar amplified by lake-effect humidity and significant mold pressure.