Rio Grande pollen forecast - today, tomorrow and the week ahead
Pollen Today
Today (20 September) pollen in Rio Grande is low; cypress is low.
Pollen Tomorrow
Tomorrow (21 September 2026) cypress remains low, willow at low levels.
7-Day Trend
Over the next week grass will increase; cypress and willow will decrease.
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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 | 1/100 |
| Grass (Poaceae) | None | 0/100 |
| Willow (Salicaceae) | None | 0/100 |
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 | 2/100 | |
| Grass (Poaceae) | None | 0/100 | |
| Willow (Salicaceae) | Low | 4/100 |
Local Environmental Conditions
Rio Grande lies at the mouth of the Patos Lagoon on the Rio Grande do Sul southern coast, where native pampa grasses, coastal dune vegetation, and the Lagoa dos Patos shoreline vegetation are the main pollen sources at this southernmost major Brazilian port. The subtropical climate produces a well-defined pollen season, while the coastal position means onshore Atlantic winds frequently disperse pollen and the flat southern landscape allows wide dispersal throughout.
Rio Grande's pollen season follows the region's typical pattern, led by native pampa grasses and coastal dune 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 Rio Grande do Sul
Is pollen high in Rio Grande right now?
On 20 September 2026, overall pollen levels in Rio Grande are low. Cypress is the main contributor to airborne pollen
Will pollen levels change in Rio Grande tomorrow?
On 21 September 2026, pollen conditions in Rio Grande will be different from today, with willow at low levels, cypress at low levels
Is pollen expected to decrease in Rio Grande this week?
According to the five-day outlook, willow and cypress pollen levels are expected to gradually decrease, while grass pollen will increase, suggesting mixed conditions later in the week.
Which pollen types are currently active in Rio Grande?
On 20 September 2026, Cypress is the dominant pollen source in Rio Grande. grass and willow are not currently active.
When is pollen season in Rio Grande?
How often is the Rio Grande pollen forecast updated?
The Rio Grande pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Rio Grande 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 Rio Grande 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 Rio Grande, 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. |
Get More in the Airmine Pollen app
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).
