Viana do Castelo pollen forecast - today, tomorrow and the week ahead
Today (9 August) pollen in Viana do Castelo is low; mugwort is low. Tomorrow (10 August 2026) levels are similar. Over the following five days mugwort 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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Viana do Castelo's coastal parks and the Lima River corridor oak and eucalyptus provide most of the tree pollen, and grass from Viana do Castelo farmland contributes through the spring weeks. The area's Atlantic exposure brings frequent rainfall interruptions.
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):
None
0/100
-
Willow (Salicaceae):
None
0/100
-
Mugwort (Artemisia):
Low
20/100
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):
None
0/100
-
Willow (Salicaceae):
None
0/100
-
Mugwort (Artemisia):
Low
22/100
Air quality in Viana do Castelo
View air qualityFrequently Asked Questions
Is pollen high in Viana do Castelo right now?
On 9 August 2026, overall pollen levels in Viana do Castelo are low. Artemisia is the main contributor to airborne pollen
Will pollen levels change in Viana do Castelo tomorrow?
On 10 August 2026, pollen conditions in Viana do Castelo will be similar to today, with artemisia at low levels
Is pollen expected to decrease in Viana do Castelo this week?
According to the five-day outlook, artemisia pollen levels will increase later in the week.
Which pollen types are currently active in Viana do Castelo?
On 9 August 2026, Artemisia is the dominant pollen source in Viana do Castelo. hazel, cypress, grass, and willow are not currently active.
When is pollen season in Viana do Castelo?
How often is the Viana do Castelo pollen forecast updated?
The Viana do Castelo pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Viana do Castelo 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 Viana do Castelo 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 Viana do Castelo, 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 Portugal?
Check pollen in other popular cities:
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 Viana do Castelo.
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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.