Viana do Castelo Pollen Forecast - Today, Tomorrow and the Week Ahead
Pollen Today
Today (10 October) pollen in Viana do Castelo is high; mugwort is high; mold (cladosporium) is moderate; mold (alternaria) is low.
Pollen Tomorrow
Tomorrow (11 October 2026) levels are similar to today.
7-Day Trend
Over the next week mold (alternaria) and mold (cladosporium) will increase; mugwort will decrease; cypress, grass, and willow will remain stable.
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Pollen Risk
Today - 10 October
| 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) | High | 66/100 |
| Mold (Alternaria) | Low | 18/100 |
| Mold (Cladosporium) | Moderate | 33/100 |
Tomorrow - 11 October
| 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) | High | 55/100 | |
| Mold (Alternaria) | Low | 15/100 | |
| Mold (Cladosporium) | Moderate | 28/100 |
Local Environmental Conditions
The center of Viana do Castelo is surrounded mainly by built-up land, which covers around 59% of the nearby area, with a good deal of woodland. Close to the Lima River, riverside trees such as willow add to local tree pollen. Oak is the most prominent allergenic tree nearby, with willow also present. Grass pollen is significant here, and mugwort and plantain contribute weed pollen.
Oak and willow lead the season in mid-spring, as temperatures climb to around 15°C, and tree pollen reaches its peak. Grasses take over in early summer, with temperatures around 20°C, and their pollen lingers into early fall. The season closes with mugwort and plantain from midsummer into early fall. Rain is heaviest in fall, often giving short breaks from high pollen levels.
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Frequently Asked Questions About Pollen in Viana do Castelo
Is pollen high in Viana do Castelo right now?
On 10 October 2026, overall pollen levels in Viana do Castelo are high. Artemisia is the main contributor to airborne pollen
Will pollen levels change in Viana do Castelo tomorrow?
On 11 October 2026, pollen conditions in Viana do Castelo will be similar to today, with artemisia at high levels
Is pollen expected to decrease in Viana do Castelo this week?
According to the five-day outlook, artemisia pollen levels are expected to gradually decrease, suggesting improving conditions later in the week.
Which pollen types are currently active in Viana do Castelo?
On 10 October 2026, Artemisia is the dominant pollen source in Viana do Castelo. 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.
Understanding the Scale
The 0–100 pollen scores represent risk levels, not direct pollen measurements. Higher scores indicate higher risk.
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. |
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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).
