Pollen Count in Oporto
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Oporto, in northern Spain, has a humid climate. Pollen seasons start early. Trees, grasses, and weeds release pollen. This happens when weather gets warmer.
Updated: 2/11/2026
February and March are months with high pollen counts. Trees like oak, beech, and pine produce a lot of pollen. It floats in the air.
Grasses and weeds add to the pollen in May and June. People notice more pollen on cars and outside. It makes a yellowish layer.
By July and August, pollen counts decrease. Weather gets hotter and drier. Some plants still produce pollen, but not as much as before.
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 Oporto 🌾. 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 | 199.6 | 0 | 0 | 0 | 0 | 0 |
| Feb | 64.2 | 0 | 0 | 0 | 0 | 0 |
| Mar | 0.6 | 18.5 | 1.6 | 0 | 0 | 0 |
| Apr | 0.5 | 333.6 | 45.1 | 0 | 4.5 | 0 |
| May | 0 | 15.7 | 360.8 | 0 | 181.8 | 0 |
| Jun | 0 | 0.5 | 605.6 | 0 | 118.3 | 0 |
| Jul | 0 | 0 | 198.3 | 0 | 2.7 | 0 |
| Aug | 0 | 0 | 45.4 | 1.4 | 0 | 0 |
| Sep | 0 | 0 | 3.7 | 0.4 | 0 | 0.9 |
| Oct | 0 | 0 | 0 | 0.2 | 0 | 0 |
| Nov | 0 | 0 | 0 | 0.4 | 0 | 0 |
| Dec | 0 | 0 | 0 | 0 | 0 | 0 |