San José, Costa Rica Pollen Count Today
San José, Costa Rica · 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).
San José, Costa Rica
Weeds Index
How active weeds pollen is today (0–100).
San José, Costa Rica
Pollen Types
Pick a pollen subtype to update the species forecast
5-Day San José Overall Pollen Forecast
Bars are colored by severity (Low/Moderate/High).
Pollen count San José residents check each morning
The San José pollen count today is 9 (Low). The main driver is Ragweed, with weed pollen at 10 today. That total sits on a narrow base: weed pollen is 10 while tree pollen is just 8 and grass pollen 4. Plant-by-plant detail for San José, Costa Rica follows, along with the outlook for the days ahead. 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 weed pollen or mold, reading noticeably higher than the rest, which is why the split is printed on every San José 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 San José pollen forecast below — it is currently mixed, with Tuesday the highest day in the window.
This is the pollen count San José residents check each morning, built from the day’s tree, grass, weed and mold readings.
What is the San José pollen count today?
The San José pollen count today is 9 out of 100 (Low) on the Pollen Atlas Total Pollen Index, driven mainly by Ragweed.
Short answer for anyone searching pollen count today San José: this page is updated every morning with the day’s modelled reading.
San José allergies today
San José allergies today are set by the same reading as the pollen count above: the Total Pollen Index is 9 (Low), driven mainly by Ragweed. When people ask about San José allergies, this is the number that answers them — one daily index built from today’s tree, grass, weed and mold readings for San José.
Allergies in San José follow the Costa Rica 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 San José 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 San José allergy forecast: today reads 9 (Low), and the day-by-day outlook shows whether San José 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 San José today records is this same combined reading — tree, grass, weed and mold in one index.
The San José allergy count today is 9 (Low) — the same Total Pollen Index as the pollen count above, in one combined reading.
Pollen count today San José: the 5-day forecast
| Day | Total Pollen Index | Band |
|---|---|---|
| Saturday, November 7 | 9 | Low |
| Sunday, November 8 | 9 | Low |
| Monday, November 9 | 8 | Low |
| Tuesday, November 10 | 14 | Low |
| Wednesday, November 11 | 8 | Low |
Pollen Atlas forecasts San José’s pollen count to peak on Tuesday at 14 (Low) over the next 5 days.
Pollen by type in San José
What is driving San José’s pollen today
The shape of today’s 9 (Low) is set by weed pollen at 10 (Low on its own scale) — about 45% of the four category readings added together, 2 points clear of the next category, tree pollen at 8. A weed-led total is the classic late-year shape: tree and grass pollen have usually receded, leaving weed pollen — and on damp days mold — to make up most of what the index records. Weed pollen leading in November is a modelled reading, reported as modelled — no regional calendar is asserted for Costa Rica, and the modelled value outranks any general seasonal expectation.
Plant-level detail is not in today’s feed for San José, 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 8 to 14, never changing band. Today’s 9 sits 1 point below the window’s average of 9.6 — a moving window, worth reading day by day rather than from the average.
Plants affecting San José now
Detailed plant-by-plant readings for San José 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 8 (Low).
Grass pollen is one of the categories with a non-zero reading today, at 4 (Low).
Weed pollen is one of the categories with a non-zero reading today, at 10 (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.
San José pollen through the year
Chapter by chapter, the San José pollen year runs like this:
- Tree pollen seasons vary with local climate and vegetation, so this page reports the measured readings first and treats any calendar as background only.
- Grass pollen seasons vary with local climate and vegetation, and the measured value outranks any general seasonal expectation.
- Weed pollen seasons vary with local climate and vegetation, and no regional calendar is asserted for this area.
No Costa Rica allergy season guide is published yet, so this page does not single out signature pollens for San José — the calendar above is the Global regional pattern, and the plant detail on this page names what today’s feed actually records.
November in San José is reported from its modelled readings, not from a regional calendar — no regional calendar is asserted for Costa Rica, so the calendar alone explains little today, and the modelled split above carries the story. No Costa Rica allergy season guide is published yet — this calendar follows the Global regional pattern. See San José pollen count rankings and San José on the pollen heatmap.
How to read this index
Pollen Atlas reports the San José 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 San José, Costa Rica 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.
San José in today’s national picture
At 9 (Low), San José ranks joint 82111th 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 San José: Managua, Nicaragua (340 km away) reads 9 (Low); Panama City, Panama (512 km away) reads 9 (Low); San Miguelito, Panama (515 km away) reads 9 (Low). San José reads exactly level with its nearest tracked neighbour today. Across the wider Global today, readings run from 5 in Almaty, Kazakhstan to 39 in Nacala, Mozambique.
Pollen totals are population numbers; symptoms are personal. The same reading can leave one San José resident untouched and floor another, depending on which pollens they are sensitised to. If this pattern finds you every season, allergists in San José, Costa Rica 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.
San José in its local area
San José is in San José, Costa Rica. Its population is 335,007 (GeoNames).
Like every Pollen Atlas city page, the San José, Costa Rica pollen count is refreshed each morning.
Nearby cities
- Managua pollen count (340 km away)
- Panama City pollen count (512 km away)
- San Miguelito pollen count (515 km away)
- Danlí pollen count (531 km away)
- Tegucigalpa pollen count (573 km away)
- San Miguel pollen count (596 km away)
From Pollen Atlas News
See how San José 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).