São Luís, Brazil Pollen Count Today
São Luís, Brazil · Updated Saturday, November 7, 2026
Pollen Overview
Today's overall pollen level and the dominant type (trees, weeds, grass, or mold).
Total Pollen Index
The combined pollen level across all types (0–100).
São Luís, Brazil
Weeds Index
How active weeds pollen is today (0–100).
São Luís, Brazil
Pollen Types
Pick a pollen subtype to update the species forecast
5-Day São Luís Overall Pollen Forecast
Bars are colored by severity (Low/Moderate/High).
Pollen count São Luís residents check each morning
The São Luís pollen count today is 28 (Low). The main driver is Ragweed, with weed pollen at 25 today. Grass pollen is the highest single category in the split at 30 (Low), ahead of weed pollen at 25 and tree pollen at 19. The sections below break that headline number down by plant, by day and by what the band means in practice. Pollen Atlas updated this count on Saturday, November 7, 2026.
A Low band on the Pollen Atlas index means the Total Pollen Index has stayed in the lower part of the 0–100 scale. Readings in this band are built from low individual category values rather than from one large spike, and the category split above matters more than the headline number: a low total can still contain one category, such as grass pollen, reading noticeably higher than the rest, which is why the split is printed on every São Luís page.
Fall is ragweed season across most of the United States: ragweed plants release pollen from late summer into autumn, and weed pollen is typically the last major outdoor pollen category to fade as the weather cools. That pattern is why an autumn total is so often weed-led even when the headline number is low — tree and grass pollen have usually receded by then, leaving weed pollen, and on damp days mold, to make up most of what the index records.
To see whether today’s pollen level holds, check the 5-day São Luís pollen forecast below — it is currently holding, with Saturday the highest day in the window.
This is the pollen count São Luís residents check each morning, built from the day’s tree, grass, weed and mold readings.
What is the São Luís pollen count today?
The São Luís pollen count today is 28 out of 100 (Low) on the Pollen Atlas Total Pollen Index, driven mainly by Ragweed.
Short answer for anyone searching pollen count today São Luís: this page is updated every morning with the day’s modelled reading.
São Luís allergies today
São Luís allergies today are set by the same reading as the pollen count above: the Total Pollen Index is 28 (Low), driven mainly by Ragweed. When people ask about São Luís allergies, this is the number that answers them — one daily index built from today’s tree, grass, weed and mold readings for São Luís.
Allergies in São Luís follow the Brazil calendar set out below — the chapters, the plants behind them, and the 5-day forecast on this page show whether today is typical for the season or an exception to it. If you are checking allergies today in São Luís before heading outdoors, the split at the top of this page is the part to read: it shows which pollen is doing the work today, not just how high the total sits.
Read the five-day table on this page as the São Luís allergy forecast: today reads 28 (Low), and the day-by-day outlook shows whether São Luís allergies are set to ease or build across the week — the days to plan outdoor time around are the ones where the index steps down, not just today.
In practice, the allergy count São Luís today records is this same combined reading — tree, grass, weed and mold in one index.
The São Luís allergy count today is 28 (Low) — the same Total Pollen Index as the pollen count above, in one combined reading.
Pollen count today São Luís: the 5-day forecast
| Day | Total Pollen Index | Band |
|---|---|---|
| Saturday, November 7 | 28 | Low |
| Sunday, November 8 | 28 | Low |
| Monday, November 9 | 28 | Low |
| Tuesday, November 10 | 28 | Low |
| Wednesday, November 11 | 28 | Low |
Pollen Atlas forecasts São Luís’s pollen count to peak on Saturday at 28 (Low) over the next 5 days.
Pollen by type in São Luís
What is driving São Luís’s pollen today
The shape of today’s 28 (Low) is set by grass pollen at 30 (Low on its own scale) — about 41% of the four category readings added together, 5 points clear of the next category, weed pollen at 25. Grass-led totals tend to hold a level for days at a time rather than spike and clear, because grasses pollinate over an extended period. Grass pollen leading in November is a modelled reading, reported as modelled — no regional calendar is asserted for Brazil, and the modelled value outranks any general seasonal expectation.
Plant-level detail is not in today’s feed for São Luís, so the drivers have to be read from the category split above — it shows how much of today’s total each category is actually carrying, and plant detail returns here automatically on any day the feed includes it.
Across the five-day window the Total Pollen Index runs from 28 to 28, never changing band. Today’s 28 sits level with the window’s average of 28 — a steady window, in which one day reads much like the next.
Plants affecting São Luís now
Detailed plant-by-plant readings for São Luís were not returned in today\u2019s source data, so this section summarises the pollen types the index above is built from instead of listing individual plants.
Tree pollen is one of the categories with a non-zero reading today, at 19 (Low).
Grass pollen is one of the categories with a non-zero reading today, at 30 (Low).
Weed pollen is one of the categories with a non-zero reading today, at 25 (Low).
In the Global pattern, the plants that shape this city’s year vary with its local climate and vegetation, and no single regional calendar is published for this area — named here as regional context only, not as today\u2019s measurements.
Plant detail returns here automatically on any day the source data includes it.
Every pollen type, with photos and seasons: the pollen directory.
São Luís pollen through the year
The São Luís pollen year runs in chapters, set by the Global pattern and the Brazil calendar. Trees come first: tree pollen seasons vary with local climate and vegetation, so this page reports the measured readings first and treats any calendar as background only. Grasses take the middle of the year: grass pollen seasons vary with local climate and vegetation, and the measured value outranks any general seasonal expectation. Weeds close it out: weed pollen seasons vary with local climate and vegetation, and no regional calendar is asserted for this area.
No Brazil allergy season guide is published yet, so this page does not single out signature pollens for São Luís — the calendar above is the Global regional pattern, and the plant detail on this page names what today’s feed actually records.
November in São Luís is reported from its modelled readings, not from a regional calendar — no regional calendar is asserted for Brazil, so the calendar alone explains little today, and the modelled split above carries the story. No Brazil allergy season guide is published yet — this calendar follows the Global regional pattern. See São Luís pollen count rankings and São Luís on the pollen heatmap.
How to read this index
Pollen Atlas reports the São Luís pollen count on a Total Pollen Index from 0 to 100, built from separate tree, grass and weed readings. The total is a summary, not an average of the three: a single strong category can lift it, and three quiet categories can hold it down even in a month when São Luís, Brazil pollen is usually more active. Index values are a modelled pollen risk index computed by Pollen Atlas from open weather, vegetation and phenology data, calibrated against CDC/NAB season data, with plant detail by the Google Pollen API. The index is a modelled 0–100 scale, not a measured count, and figures update through the day, so a morning and an evening visit to this page can legitimately show different numbers.
São Luís in today’s national picture
At 28 (Low), São Luís ranks joint 21058th of the 90896 cities Pollen Atlas tracks today — in the middle of the national table. The highest reading in the country today is Beja, Portugal at 52, and the lowest is Los Ángeles de San Rafael, Spain at 5. The whole table spans 47 points today — a wide-open day, when the top and bottom of the table are effectively in different seasons.
Around São Luís: São José de Ribamar, Brazil (27 km away) reads 27 (Low); Teresina, Brazil (330 km away) reads 30 (Low); Castanhal, Brazil (425 km away) reads 31 (Low). São Luís reads 1 point higher than its nearest tracked neighbour today. Across Brazil’s 173 tracked cities, today runs from 8 in Colombo to 36 in Arapiraca.
Pollen totals are population numbers; symptoms are personal. The same reading can leave one São Luís resident untouched and floor another, depending on which pollens they are sensitised to. If this pattern finds you every season, allergists in São Luís, Brazil can test whether tree, grass, weed or mold is the category that matters for you — the four readings at the top of this page are the starting point for that conversation.
São Luís in its local area
São Luís is in São Luís, Maranhão, Brazil. Its population is 917,237 (GeoNames).
Across Brazil’s 173 tracked cities, São Luís ranks joint 54th today.
Like every Pollen Atlas city page, the São Luís, Brazil pollen count is refreshed each morning.
Nearby cities
- São José de Ribamar pollen count (27 km away)
- Teresina pollen count (330 km away)
- Castanhal pollen count (425 km away)
- Sobral pollen count (457 km away)
- Ananindeua pollen count (470 km away)
- Belém pollen count (482 km away)
From Pollen Atlas News
See how São Luís ranks in today's pollen count rankings — the worst cities for allergies today
Pollen indexes: a modelled pollen risk index computed by Pollen Atlas from open weather, vegetation and phenology data, calibrated against CDC/NAB season data. Plant detail: Google Pollen API. Index values are modelled, not measured counts. Sources: CDC/NAB; USA-NPN; GBIF (CC BY); ESA WorldCover (CC BY 4.0).