Pollen Count in Sundsvall
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Sundsvall has four main pollen seasons. Tree pollen starts in March. Many trees make a lot of pollen. It makes the air look yellow.
Updated: 3/5/2026
Grass pollen starts in May. It lasts all summer. Grasses make a lot of pollen. This is bad news for people who are outside.
Weed pollen starts in August. It lasts until frost. Weeds make a lot of pollen. The air can feel itchy.
In winter, there is little pollen. The snow melts and trees start growing. Then the cycle starts again. Sundsvall's pollen seasons keep repeating.
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 Sundsvall 🌾. 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 | 0 | 0 | 0 | 0 | 0 |
| Feb | 1.7 | 0 | 0 | 0 | 0 | 0 |
| Mar | 14.9 | 0.8 | 0 | 0 | 0 | 0 |
| Apr | 3.1 | 1959.8 | 0 | 0 | 0 | 0 |
| May | 3.1 | 2308.8 | 2.5 | 0 | 0 | 0 |
| Jun | 0 | 137 | 167.9 | 0 | 0 | 0 |
| Jul | 0 | 12.1 | 184.7 | 33.1 | 0 | 0 |
| Aug | 0 | 0 | 7.1 | 7.6 | 0 | 0 |
| Sep | 0 | 0 | 0.2 | 0 | 0 | 2.5 |
| Oct | 0 | 0 | 0 | 0 | 0 | 0 |
| Nov | 0 | 0 | 0 | 0 | 0 | 0 |
| Dec | 0 | 0 | 0 | 0 | 0 | 0 |