Tillamook pollen forecast - today, tomorrow and the week ahead
Pollen Today
Today (20 September) pollen in Tillamook is high; ragweed is high; mugwort is moderate; grass is low.
Pollen Tomorrow
Tomorrow (21 September 2026) mugwort declining, ragweed declining, grass no longer expected.
7-Day Trend
Over the next week grass will increase; mugwort 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) | Low | 1/100 |
| Willow (Salicaceae) | None | 0/100 |
| Mugwort (Artemisia) | Moderate | 26/100 |
| Ragweed (Ambrosia) | High | 54/100 |
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) | None | 0/100 | |
| Willow (Salicaceae) | None | 0/100 | — |
| Mugwort (Artemisia) | Low | 20/100 | |
| Ragweed (Ambrosia) | Moderate | 49/100 |
Local Environmental Conditions
The vegetation around Tillamook, on a dairy valley on Tillamook Bay, is dominated by Sitka spruce and dairy pasture grasses, with coastal alder adding further seasonal pollen exposure. This mix of plant life is fairly typical for the wider area around Tillamook. Nearby towns with similar terrain tend to see a broadly similar pattern.
The pollen calendar in Tillamook opens with alder and birch starting February with maple joining in and continuing through March and April. Grass pollen then peaks through May and June, and mugwort and nettle extend exposure into September. Frequent spring rain across the Pacific Northwest periodically clears pollen from the air, moderating peak counts, shaping conditions across the city.
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Frequently Asked Questions About Pollen in Oregon
Is pollen high in Tillamook right now?
On 20 September 2026, overall pollen levels in Tillamook are high. Ambrosia is the main contributor to airborne pollen, while artemisia and grass remain at lower levels
Will pollen levels change in Tillamook tomorrow?
On 21 September 2026, pollen conditions in Tillamook will be different from today, with artemisia, ambrosia continuing to decline
Is pollen expected to decrease in Tillamook this week?
According to the five-day outlook, artemisia and ambrosia pollen levels are expected to gradually decrease, while grass pollen will increase, suggesting mixed conditions later in the week.
Which pollen types are currently active in Tillamook?
On 20 September 2026, Ambrosia is the dominant pollen source in Tillamook. artemisia and grass are also present but at lower levels.
When is pollen season in Tillamook?
How often is the Tillamook pollen forecast updated?
The Tillamook pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Tillamook 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 Tillamook 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 Tillamook, 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).
