St. Clair Shores pollen forecast - today, tomorrow and the week ahead
Pollen Today
Today (20 September) pollen in St. Clair Shores is moderate; grass and ragweed are moderate; mugwort is low.
Pollen Tomorrow
Tomorrow (21 September 2026) grass remains moderate, ragweed remains moderate, mugwort no longer expected.
7-Day Trend
Over the next week mugwort will increase; grass and ragweed will decrease.
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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 | 37/100 |
| Willow (Salicaceae) | None | 0/100 |
| Mugwort (Artemisia) | Low | 6/100 |
| Ragweed (Ambrosia) | Moderate | 48/100 |
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) | Moderate | 27/100 | |
| Willow (Salicaceae) | None | 0/100 | — |
| Mugwort (Artemisia) | None | 0/100 | |
| Ragweed (Ambrosia) | Moderate | 37/100 |
Local Environmental Conditions
St. Clair Shores's Macomb County Michigan Lake St. Clair setting features maple, oak, and cottonwood as the main tree pollen sources, with exposure varying between the greener residential lakefront neighborhoods and the more built-up commercial corridors along Jefferson Avenue. The Lake St. Clair shoreline creates distinct onshore-inland pollen gradients, while lake breezes create significantly different pollen conditions between the lakefront and inland areas throughout the season.
St. Clair Shores's Lake St. Clair setting in Michigan produces a season opening in late March with elm and maple before oak peaks through May. Grass from surrounding Michigan farmland peaks through June and July before mugwort and nettle extend exposure into September. The lake proximity moderates temperatures and onshore lake breezes can periodically suppress pollen dispersal throughout this Macomb County lakefront community.
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Frequently Asked Questions About Pollen in Michigan
Is pollen high in St. Clair Shores right now?
On 20 September 2026, overall pollen levels in St. Clair Shores are moderate. Grass is the main contributor to airborne pollen, while ambrosia and artemisia remain at lower levels
Will pollen levels change in St. Clair Shores tomorrow?
On 21 September 2026, pollen conditions in St. Clair Shores will be different from today, with grass at moderate levels, ambrosia at moderate levels
Is pollen expected to decrease in St. Clair Shores this week?
According to the five-day outlook, grass and ambrosia pollen levels are expected to gradually decrease, while artemisia pollen will increase, suggesting mixed conditions later in the week.
Which pollen types are currently active in St. Clair Shores?
On 20 September 2026, Grass is the dominant pollen source in St. Clair Shores. ambrosia and artemisia are also present but at lower levels.
When is pollen season in St. Clair Shores?
How often is the St. Clair Shores pollen forecast updated?
The St. Clair Shores pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in St. Clair Shores 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 St. Clair Shores 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 St. Clair Shores, 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. |
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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).
