Coos Bay pollen forecast - today, tomorrow and the week ahead

Today (9 August) pollen in Coos Bay is medium; grass and ragweed are medium; mugwort is low. Tomorrow (10 August 2026) levels are similar - grass remains medium, mugwort remains low, 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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Set on Oregon's largest coastal harbor town, Coos Bay's landscape is defined by Sitka spruce alongside western hemlock and coastal salal, the main contributors to seasonal pollen exposure. Individual yards and gardens around Coos Bay can still vary somewhat from this general pattern. Small local variations aside, this pattern holds fairly steady from year to year.

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):

    Medium

    38/100

  • Willow (Salicaceae):

    None

    0/100

  • Mugwort (Artemisia):

    Low

    5/100

  • Ragweed (Ambrosia):

    Medium

    39/100

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):

    Medium

    48/100

  • Willow (Salicaceae):

    None

    0/100

  • Mugwort (Artemisia):

    Low

    17/100

  • Ragweed (Ambrosia):

    High

    51/100

Air quality in Coos Bay

View air quality

Sports venues in Coos Bay

Bandon Dunes Golf Resort – Bandon Dunes Course Bandon Preserve – Bandon Preserve Course Bandon Trails – Bandon Trails Course Old Macdonald – Old Macdonald Course Pacific Dunes – Pacific Dunes Course Sheep Ranch – Sheep Ranch Course

Frequently Asked Questions

Is pollen high in Coos Bay right now?

On 9 August 2026, overall pollen levels in Coos Bay are moderate. Grass is the main contributor to airborne pollen, while ambrosia and artemisia remain at lower levels

Will pollen levels change in Coos Bay tomorrow?

On 10 August 2026, pollen conditions in Coos Bay will be different from today, with grass at medium levels, artemisia at low levels and ambrosia increasing

Is pollen expected to decrease in Coos Bay 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 Coos Bay?

On 9 August 2026, Grass is the dominant pollen source in Coos Bay. ambrosia and artemisia are also present but at lower levels. cypress are not currently active.

When is pollen season in Coos Bay?
Coos Bay's pollen season opens with alder and birch from February then maple follows, running through March and April. Grass pollen then peaks through May and June, and mugwort and nettle extend exposure into September. The damp, mild regional climate keeps pollen counts lower than in drier parts of the country, though spring rain events can trigger brief spikes.
How often is the Coos Bay pollen forecast updated?

The Coos Bay pollen forecast is updated four times daily. See the timestamp below for the most recent update.

Does pollen in Coos Bay 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 Coos Bay 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 Coos Bay, 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?

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Check pollen in other popular cities:

Melton Rio de Janeiro Copenhagen Athens Denpasar Rome Cape Town Barcelona London Los Angeles New York

Data provided by Airmine — Last update: 10 August 2026 at 02:34 CEST (Data is updated four times daily.)

This page provides the latest public pollen forecast for Coos Bay.

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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.