Sherman, Illinois pollen forecast - today, tomorrow and the week ahead
Pollen Today
Today (20 September) pollen in Sherman, Illinois is moderate; grass and ragweed are moderate.
Pollen Tomorrow
Tomorrow (21 September 2026) ragweed remains moderate, grass declining.
7-Day Trend
Over the next week grass, mugwort, and ragweed will increase.
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Pollen Risk
Today - 20 September
| Pollen species | Level | Value |
|---|---|---|
| Alder (Alnus) | None | 0/100 |
| Birch (Betula) | None | 0/100 |
| Hazel (Corylus) | None | 0/100 |
| Cypress (Cupressaceae) | None | 0/100 |
| Grass (Poaceae) | Moderate | 32/100 |
| Willow (Salicaceae) | None | 0/100 |
| Mugwort (Artemisia) | None | 0/100 |
| Ragweed (Ambrosia) | Moderate | 42/100 |
Tomorrow - 21 September
| Pollen species | Level | Value | 7-Day Trend |
|---|---|---|---|
| Alder (Alnus) | None | 0/100 | — |
| Birch (Betula) | None | 0/100 | — |
| Hazel (Corylus) | None | 0/100 | — |
| Cypress (Cupressaceae) | None | 0/100 | — |
| Grass (Poaceae) | Low | 21/100 | |
| Willow (Salicaceae) | None | 0/100 | — |
| Mugwort (Artemisia) | None | 0/100 | |
| Ragweed (Ambrosia) | Moderate | 30/100 |
Local Environmental Conditions
Sherman lies in the central Illinois prairie country, not far from the Sangamon River and Weldon Springs State Park woodlots. The surrounding landscape is dominated by bur oak groves and tallgrass prairie remnants. The Sangamon River winds through the wider area, its banks favoring moisture-loving trees such as willow and alder.
The earliest pollen of the year here tends to come from willow and alder growing along Salt Creek, most active from late February through March. Hardwoods around Comlara Park follow, pushing tree pollen to its height through April and into May. The stretch between the Mackinaw River and a remnant tallgrass prairie preserve typically mirrors this timing fairly closely.
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Resource Hub
Pollen forecast neighborhoods 3 neighborhoods
Sports venues in Sherman, Illinois 1 sports venue
Frequently Asked Questions About Pollen in Illinois
Is pollen high in Sherman, Illinois right now?
On 20 September 2026, overall pollen levels in Sherman, Illinois are moderate. Ambrosia is the main contributor to airborne pollen, while grass remain at lower levels
Will pollen levels change in Sherman, Illinois tomorrow?
On 21 September 2026, pollen conditions in Sherman, Illinois will be different from today, with ambrosia at moderate levels and grass continuing to decline
Is pollen expected to decrease in Sherman, Illinois this week?
According to the five-day outlook, ambrosia, artemisia, and grass pollen levels will increase later in the week.
Which pollen types are currently active in Sherman, Illinois?
On 20 September 2026, Ambrosia is the dominant pollen source in Sherman, Illinois. grass are also present but at lower levels. artemisia are not currently active.
When is pollen season in Sherman, Illinois?
How often is the Sherman, Illinois pollen forecast updated?
The Sherman, Illinois pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Sherman, Illinois come from nearby or far away?
Studies show that most pollen exposure (often 70–90%) comes from nearby sources, such as local trees and vegetation. A good pollen forecast therefore depends on accurately representing local vegetation. Pollen can travel long distances, but this usually matters only early in the season or during specific wind events.
Are pollen levels in Sherman, Illinois based on measurements or forecasts?
Pollen data is often misunderstood. Most "pollen levels" are not real-time measurements, but forecasts.
Direct pollen measurements are typically delayed by 1-2 days because they require manual analysis. To show current conditions in Sherman, Illinois, modern forecasts combine recent measurements, weather data, and information about local vegetation.
This allows us to estimate pollen levels for today and the coming days, not just report the past.
Airmine’s atmospheric monitoring platform was developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team, using satellite and Earth observation technologies to improve emissions monitoring.
Understanding the Scale
The 0–100 scores represent risk levels, not direct measurements of pollen or air pollutant concentrations. Higher scores indicate higher risk. Pollen and air quality use different thresholds.
Pollen
| None | 0 | No or negligible risk of exposure. Pollen/mold exposure is expected to be minimal. |
| Low | 0-25 | Low risk of exposure. Small amounts of pollen or mold spores may be present. |
| Moderate | 25-50 | Moderate risk of exposure. Pollen/mold exposure is expected to be noticeable. |
| High | 50-75 | High risk of exposure. Elevated pollen/mold exposure is expected. |
| Very High | 75-100 | Very high risk of exposure. Pollen/mold exposure is expected to be at or near its highest levels. |
Get More in the Airmine Pollen app
Get 15-day pollen forecasts with morning, afternoon and evening detail, plus 5-day air quality forecasts. Explore interactive pollen risk maps, estimated pollen season start, route profiles and a symptoms diary.
Features and forecast availability vary by region. Currently covering Europe, the contiguous US, southern Canada, South Africa, Australia, Indonesia (Java & Bali), Brazil, Paraguay, Uruguay and the Buenos Aires area.
Developed with support from the European Space Agency (ESA) Business Applications and Space Solutions (BASS).
