Thunder Bay pollen forecast - today, tomorrow and the week ahead
Today (30 August) pollen in Thunder Bay is high; grass and ragweed are high; mugwort is low. Tomorrow (31 August 2026) levels are similar - mugwort remains low, ragweed remains high, grass declining. Over the following five days grass and mugwort will increase; ragweed will decrease. 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
Follow your pollen exposure and performance with the free Airmine–Strava integration. See your pollen and air quality exposure for every Strava activity.
Thunder Bay's Lake Superior shoreline setting beneath the Sleeping Giant formation features spruce, pine, and birch as the main tree pollen sources, with exposure varying between boreal forest and the built-up port-city centre.
Today - 30 August
-
Alder (Alnus):
None
0/100
-
Birch (Betula):
None
0/100
-
Hazel (Corylus):
None
0/100
-
Cypress (Cupressaceae):
None
0/100
-
Grass (Poaceae):
High
58/100
-
Willow (Salicaceae):
None
0/100
-
Mugwort (Artemisia):
Low
23/100
-
Ragweed (Ambrosia):
High
70/100
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 - 31 August
-
Alder (Alnus):
None
0/100
-
Birch (Betula):
None
0/100
-
Hazel (Corylus):
None
0/100
-
Cypress (Cupressaceae):
None
0/100
-
Grass (Poaceae):
Moderate
45/100
-
Willow (Salicaceae):
None
0/100
-
Mugwort (Artemisia):
Low
10/100
-
Ragweed (Ambrosia):
High
65/100
Air quality in Thunder Bay
View air qualityPollen forecast for neighborhoods and landmarks in Thunder Bay
Sports venues in Thunder Bay
Frequently Asked Questions
Is pollen high in Thunder Bay right now?
On 30 August 2026, overall pollen levels in Thunder Bay are high. Grass is the main contributor to airborne pollen, while ambrosia and artemisia remain at lower levels
Will pollen levels change in Thunder Bay tomorrow?
On 31 August 2026, pollen conditions in Thunder Bay will be different from today, with ambrosia at high levels, artemisia at low levels and grass continuing to decline
Is pollen expected to decrease in Thunder Bay this week?
According to the five-day outlook, ambrosia pollen levels are expected to gradually decrease, while grass and artemisia pollen will increase, suggesting mixed conditions later in the week.
Which pollen types are currently active in Thunder Bay?
On 30 August 2026, Grass is the dominant pollen source in Thunder Bay. ambrosia and artemisia are also present but at lower levels. cypress are not currently active.
When is pollen season in Thunder Bay?
How often is the Thunder Bay pollen forecast updated?
The Thunder Bay pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Thunder 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 Thunder 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 Thunder 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.
Check pollen in other popular cities:
Data provided by Airmine — Last update: 30 August 2026 at 14:32 CEST (Data is updated four times daily.)
This page provides the latest public pollen forecast for Thunder Bay.
Get the full experience in the Airmine app.
Unless explicitly made clear, the content on this site has not been paid for by external organisations and is Airmine's sole responsibility.
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.
Some text on this page may be generated or summarised using artificial intelligence (AI). Wherever possible, AI-generated content is enriched with Airmine's proprietary data to improve its accuracy and relevance. However, AI-generated content may still contain errors, omissions, or inaccuracies.