Sisters pollen forecast - today, tomorrow and the week ahead
Today (9 August) pollen in Sisters is medium; mugwort is medium; grass and ragweed are low. Tomorrow (10 August 2026) levels are similar - grass remains low, mugwort increasing, ragweed increasing. Over the following five days grass, mugwort, and ragweed will increase. Forecasts are calculated by Airmine using satellites to map local vegetation and determine pollen season onset.
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Developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team
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Sisters's setting on a high-desert town at the foot of the Cascade peaks in central Oregon supports ponderosa pine forest, juniper woodland, and sagebrush steppe as the leading local vegetation, all factoring into the pollen count through the year. This mix of plant life is fairly typical for the wider area around Sisters. The mix of native and introduced species here is fairly typical for this part of the country.
Today - 9 August
-
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):
Medium
45/100
-
Ragweed (Ambrosia):
Low
24/100
High pollen levels may trigger sneezing, itchy eyes, and congestion. Airmine's neighbourhood estimates use satellites to map local vegetation and a statistical prediction model, updated four times daily.
Tomorrow - 10 August
-
Alder (Alnus):
None
0/100
-
Birch (Betula):
None
0/100
-
Hazel (Corylus):
None
0/100
-
Cypress (Cupressaceae):
None
0/100
-
Grass (Poaceae):
Low
16/100
-
Willow (Salicaceae):
None
0/100
-
Mugwort (Artemisia):
High
58/100
-
Ragweed (Ambrosia):
Medium
38/100
Air quality in Sisters
View air qualityPollen forecast for neighborhoods and landmarks in Sisters
Frequently Asked Questions
Is pollen high in Sisters right now?
On 9 August 2026, overall pollen levels in Sisters are moderate. Artemisia is the main contributor to airborne pollen, while grass and ambrosia remain at lower levels
Will pollen levels change in Sisters tomorrow?
On 10 August 2026, pollen conditions in Sisters will be different from today, with grass at low levels and ambrosia, artemisia increasing
Is pollen expected to decrease in Sisters this week?
According to the five-day outlook, grass, ambrosia, and artemisia pollen levels will increase later in the week.
Which pollen types are currently active in Sisters?
On 9 August 2026, Artemisia is the dominant pollen source in Sisters. grass and ambrosia are also present but at lower levels. cypress are not currently active.
When is pollen season in Sisters?
How often is the Sisters pollen forecast updated?
The Sisters pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Sisters 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 Sisters 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 Sisters, 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.
Want to see pollen forecasts for other cities in United States?
Check pollen in other popular cities:
Data provided by Airmine — Last update: 9 August 2026 at 20:27 CEST (Data is updated four times daily.)
This page provides the latest public pollen forecast for Sisters.
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Disclaimer: Forecasts are provided for informational purposes only and should not be relied upon as medical advice. Actual pollen and air quality conditions may vary from the forecast. If you have allergies, asthma, or another medical condition, consult a healthcare professional. Please see our Terms of Service for important information about limitations of liability.