São Sebastião pollen forecast - today, tomorrow and the week ahead
Pollen Today
Today (11 September) pollen in São Sebastião is low; cypress and willow are low.
Pollen Tomorrow
Tomorrow (12 September 2026) levels are similar to today.
7-Day Trend
Over the next week cypress and willow will decrease; grass will remain stable.
Forecasts are calculated by Airmine using satellites to map local vegetation and determine pollen season onset. Airmine's estimates use satellites to map local vegetation and a statistical prediction model, updated four times daily. Developed with support from the European Space Agency (ESA) Business Applications and Space Solutions (BASS) team.
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Air Quality
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Pollen Risk
Today - 11 September
| Pollen species | Level | Value |
|---|---|---|
| Alder (Alnus) | None | 0/100 |
| Birch (Betula) | None | 0/100 |
| Hazel (Corylus) | None | 0/100 |
| Cypress (Cupressaceae) | Low | 1/100 |
| Grass (Poaceae) | None | 0/100 |
| Willow (Salicaceae) | Low | 1/100 |
Tomorrow - 12 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 | 2/100 | |
| Grass (Poaceae) | None | 0/100 | |
| Willow (Salicaceae) | Low | 1/100 |
Local Environmental Conditions
São Sebastião occupies the São Paulo northern coast at the entry to the Serra do Mar as a port and resort municipality facing Ilhabela, where native Atlantic Forest trees, restinga coastal scrub, and the dramatic escarpment vegetation are the main pollen sources. The very wet Atlantic Forest coastal climate provides very frequent rainfall interruptions, while the tropical climate supports year-round pollen production throughout this important São Paulo northern coastal municipality.
São Sebastião's pollen season follows the region's typical pattern, led by native Atlantic Forest trees and the dramatic escarpment vegetation pollen, with exposure varying across the year according to local seasonal rainfall and temperature patterns.
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Frequently Asked Questions About Pollen in São Paulo
Is pollen high in São Sebastião right now?
On 11 September 2026, overall pollen levels in São Sebastião are low. Willow is the main contributor to airborne pollen, while cypress remain at lower levels
Will pollen levels change in São Sebastião tomorrow?
On 12 September 2026, pollen conditions in São Sebastião will be similar to today, with willow at low levels, cypress at low levels
Is pollen expected to decrease in São Sebastião this week?
According to the five-day outlook, willow and cypress pollen levels are expected to gradually decrease, suggesting improving conditions later in the week.
Which pollen types are currently active in São Sebastião?
On 11 September 2026, Willow is the dominant pollen source in São Sebastião. cypress are also present but at lower levels. grass are not currently active.
When is pollen season in São Sebastião?
How often is the São Sebastião pollen forecast updated?
The São Sebastião pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in São Sebastião 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 Sebastião 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 Sebastião, 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 exposure is expected to be minimal. |
| Low | 0-25 | Low risk of exposure. Small amounts of pollen may be present. |
| Moderate | 25-50 | Moderate risk of exposure. Pollen exposure is expected to be noticeable. |
| High | 50-75 | High risk of exposure. Elevated pollen exposure is expected. |
| Very High | 75-100 | Very high risk of exposure. Pollen 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).
