Butte pollen forecast - today, tomorrow and the week ahead
Pollen Today
Today (20 September) pollen in Butte is high; ragweed is high; mugwort is low.
Pollen Tomorrow
Tomorrow (21 September 2026) ragweed remains high, mugwort increasing.
7-Day Trend
Over the next week mugwort and ragweed will decrease; grass will remain stable.
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Features and forecast availability vary by region.
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) | None | 0/100 |
| Willow (Salicaceae) | None | 0/100 |
| Mugwort (Artemisia) | Low | 15/100 |
| Ragweed (Ambrosia) | High | 53/100 |
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) | Moderate | 26/100 | |
| Ragweed (Ambrosia) | High | 62/100 |
Local Environmental Conditions
The vegetation around Butte, on a former copper-mining hill city in southwestern Montana, is dominated by lodgepole pine forest and sagebrush flats, with reclaimed mine-land scrub adding further seasonal pollen exposure. Counts here rise and fall with the same broad rhythm as other places sharing this setting. Microclimates within the area can shift the timing slightly from one neighborhood to the next.
The pollen calendar in Butte opens with juniper and cottonwood starting March before ash extends the tree season through April. Peak grass pollen arrives in May and June, and grass pollen lingers into early September before tapering off. Low humidity and high elevation mean pollen disperses easily once released.
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Pollen forecast neighborhoods 1 neighborhood
Frequently Asked Questions About Pollen in Montana
Is pollen high in Butte right now?
On 20 September 2026, overall pollen levels in Butte are high. Ambrosia is the main contributor to airborne pollen, while artemisia remain at lower levels
Will pollen levels change in Butte tomorrow?
On 21 September 2026, pollen conditions in Butte will be different from today, with ambrosia at high levels and artemisia increasing
Is pollen expected to decrease in Butte this week?
According to the five-day outlook, ambrosia and artemisia pollen levels are expected to gradually decrease, suggesting improving conditions later in the week.
Which pollen types are currently active in Butte?
On 20 September 2026, Ambrosia is the dominant pollen source in Butte. artemisia are also present but at lower levels. grass are not currently active.
When is pollen season in Butte?
How often is the Butte pollen forecast updated?
The Butte pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Butte 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 Butte 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 Butte, 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).
