São João da Boa Vista pollen forecast - today, tomorrow and the week ahead
Pollen Today
Today (20 September) pollen in São João da Boa Vista is low; cypress and willow are low.
Pollen Tomorrow
Tomorrow (21 September 2026) levels are similar to today.
7-Day Trend
Over the next week cypress and willow will decrease; grass will remain stable.
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Pollen Risk
Today - 20 September
| Pollen species | Level | Value |
|---|---|---|
| Alder (Alnus) | None | 0/100 |
| Birch (Betula) | None | 0/100 |
| Hazel (Corylus) | None | 0/100 |
| Cypress (Cupressaceae) | Low | 17/100 |
| Grass (Poaceae) | None | 0/100 |
| Willow (Salicaceae) | Low | 13/100 |
Tomorrow - 21 September
| Pollen species | Level | Value | 7-Day Trend |
|---|---|---|---|
| Alder (Alnus) | None | 0/100 | — |
| Birch (Betula) | None | 0/100 | — |
| Hazel (Corylus) | None | 0/100 | — |
| Cypress (Cupressaceae) | Low | 17/100 | |
| Grass (Poaceae) | None | 0/100 | |
| Willow (Salicaceae) | Low | 13/100 |
Local Environmental Conditions
São João da Boa Vista lies in the eastern São Paulo interior highlands as a coffee and health tourism city, where eucalyptus, native Atlantic Forest remnants, and coffee plantation vegetation are the main pollen sources. The tropical highland climate produces a more defined pollen season, with the dry season from May to September concentrating pollen dispersal and the wet season bringing frequent rainfall interruptions throughout.
The driest stretch in São João da Boa Vista, May to September, brings the heaviest pollen exposure as eucalyptus and coffee plantation vegetation pollen circulates without rain to interrupt it, before wetter weather resumes and washes much of it from the air.
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Frequently Asked Questions About Pollen in São Paulo
Is pollen high in São João da Boa Vista right now?
On 20 September 2026, overall pollen levels in São João da Boa Vista are low. Cypress is the main contributor to airborne pollen, while willow remain at lower levels
Will pollen levels change in São João da Boa Vista tomorrow?
On 21 September 2026, pollen conditions in São João da Boa Vista will be similar to today, with cypress at low levels, willow at low levels
Is pollen expected to decrease in São João da Boa Vista this week?
According to the five-day outlook, cypress and willow pollen levels are expected to gradually decrease, suggesting improving conditions later in the week.
Which pollen types are currently active in São João da Boa Vista?
On 20 September 2026, Cypress is the dominant pollen source in São João da Boa Vista. willow are also present but at lower levels. grass are not currently active.
When is pollen season in São João da Boa Vista?
How often is the São João da Boa Vista pollen forecast updated?
The São João da Boa Vista pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in São João da Boa Vista 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 São João da Boa Vista 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 São João da Boa Vista, 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 scores represent risk levels, not direct measurements of pollen or air pollutant concentrations. Higher scores indicate higher risk. Pollen and air quality use different thresholds.
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).
