Pollen Counts in San Marino
Check daily pollen forecasts, the pollen map, seasonal trends, and all the cities we cover in San Marino. Forecasts update every day, so check back regularly during pollen season.
Updated: 8 Nov 2026.
San Marino Pollen Map
- Alder
- Birch
- Grass
- Mugwort
- Olive
- Ragweed
San Marino's Pollen Seasons
In San Marino, tree pollen arrives in stages. Alder and birch release pollen in March and April. Olive trees add pollen in May and June, extending the tree season into early summer for people with allergies.
Grass pollen is the most common pollen type across the year in San Marino. It appears from May through July, with June the busiest month for pollen overall. This can affect people with allergies during this season.
Weed pollen comes later in San Marino. Mugwort and ragweed release pollen in August and September. This late-summer season follows the spring tree pollen and summer grass pollen, adding another period when allergies may be affected.
Pollen Calendar for San Marino
Typical pollen calendar for San Marino, averaged across 2 cities from previous years. Alder peaks in March, Birch peaks in April, Grass peaks in June, Mugwort peaks in August, Olive peaks in May, Ragweed peaks in August. Use it to see which months each pollen type usually rises and falls.
| Alder | Birch | Grass | Mugwort | Olive | Ragweed | |
|---|---|---|---|---|---|---|
| Jan | 2.4 | 0 | 0 | 0 | 0 | 0 |
| Feb | 13.9 | 0 | 2 | 0 | 0 | 0 |
| Mar | 70.5 | 62 | 21.4 | 0 | 0 | 0 |
| Apr | 41.5 | 230.7 | 135.7 | 0 | 11.6 | 0 |
| May | 1.1 | 33.8 | 625.6 | 0 | 108.1 | 0 |
| Jun | 0.3 | 17.2 | 802 | 0 | 97.5 | 0 |
| Jul | 0 | 0.1 | 284.5 | 2.9 | 0.5 | 0.7 |
| Aug | 0 | 0 | 97.1 | 57.6 | 0 | 89.3 |
| Sep | 0 | 0 | 23.2 | 23.7 | 0 | 39.5 |
| Oct | 0 | 0 | 5.2 | 2.9 | 0 | 0.1 |
| Nov | 0 | 0 | 0.4 | 0 | 0 | 0 |
| Dec | 0 | 0 | 0 | 0 | 0 | 0 |
Values in gr/m³ (pollen grains per cubic metre), averaged across covered cities. Local microclimates vary. Not medical advice.
Places We Cover in San Marino
We publish forecasts for these cities across San Marino. Check the list to see what is near you, or view them on the San Marino Pollen Map above.
Other
Pollen information is for education and planning only. This is not medical advice. Consult a qualified healthcare provider about symptoms or treatment.