Pollen Count in Viana do Castelo
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Viana do Castelo has different pollen seasons. Tree pollen appears in March and April. Many trees produce pollen then. The air fills with tiny particles.
Updated: 5/27/2026
Grasses and plants produce pollen in May and June. This pollen is also in the air. People notice it more when it's warm and sunny.
Weeds produce pollen in late summer. August and September are the months. Pollen counts are usually lower then. The air starts to feel cleaner.
October and November bring some tree pollen again. It's not as much as in spring. The pollen season ends with winter. The air is calm and quiet.
Pollen Forecast Chart
Recommendations
When pollen concentrations reach a peak, we suggest these simple steps to help with hay fever. These tips are extra important on windy days when plants are in peak anthesis (the time when they release the most pollen).
- Wear masks if necessary
- Shower after going out
- Wear sunglasses if windy
- Close windows and doors
- Use an indoor air purifier
- Avoid wearing woolen clothes outside
- Limit outdoor activities
Annual Pollen Overview
Check out this month-by-month overview of the daily average pollen count in Viana do Castelo 🌾. This data is based on previous years and serves as a guideline to help you understand when different pollen seasons typically occur in your city.
| Alder | Birch | Grass | Mugwort | Olive | Ragweed | |
|---|---|---|---|---|---|---|
| Jan | 0.1 | 0 | 0 | 0 | 0 | 0 |
| Feb | 5.2 | 0 | 0.2 | 0 | 0 | 0 |
| Mar | 14.2 | 234.7 | 5.2 | 0 | 0 | 0 |
| Apr | 1 | 112.9 | 29.7 | 0 | 58.7 | 0 |
| May | 0 | 4.4 | 135.1 | 0 | 109.9 | 0 |
| Jun | 0 | 0 | 119.7 | 0 | 8.8 | 0 |
| Jul | 0 | 0 | 89.5 | 0 | 0.8 | 0 |
| Aug | 0 | 0 | 22.8 | 0.4 | 0 | 0 |
| Sep | 0 | 0 | 1.8 | 0.1 | 0 | 0 |
| Oct | 0 | 0 | 1.2 | 0 | 0 | 0 |
| Nov | 0 | 0 | 0 | 0 | 0 | 0 |
| Dec | 0 | 0 | 0 | 0 | 0 | 0 |
(37 km)
(60 km)