Arecibo, PR Pollen Count
Arecibo, PR · Last updated Thursday, November 5, 2026
This page shows the most recent reading available for Arecibo — from Thursday, November 5, 2026 (2 days ago) — not today's reading.
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).
Arecibo, PR
Weeds Index
How active weeds pollen is today (0–100).
Arecibo, PR
Pollen Types
Pick a pollen subtype to update the species forecast
5-Day Arecibo Overall Pollen Forecast
Bars are colored by severity (Low/Moderate/High).
Pollen count Arecibo residents check each morning
The Arecibo pollen count today is 15 (Low). The main driver is Ragweed, with weed pollen at 15 today. That total sits on a narrow base: weed pollen is 15 while tree pollen is just 14 and grass pollen 12. Plant-by-plant detail for Arecibo, PR follows, along with the outlook for the days ahead. Pollen Atlas updated this count on Thursday, November 5, 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 Arecibo 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 Arecibo pollen forecast below — it is currently mixed, with Friday the highest day in the window.
This is the pollen count Arecibo residents check each morning, built from the day’s tree, grass, weed and mold readings.
What is the Arecibo pollen count today?
The Arecibo pollen count today is 15 out of 100 (Low) on the Pollen Atlas Total Pollen Index, driven mainly by Ragweed.
Short answer for anyone searching pollen count today Arecibo: this page is updated every morning with the day’s modelled reading.
Arecibo allergies today
Arecibo allergies today are set by the same reading as the pollen count above: the Total Pollen Index is 15 (Low), driven mainly by Ragweed. When people ask about Arecibo allergies, this is the number that answers them — one daily index built from today’s tree, grass, weed and mold readings for Arecibo.
Allergies in Arecibo follow the PR 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 Arecibo 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 Arecibo allergy forecast: today reads 15 (Low), and the day-by-day outlook shows whether Arecibo 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 Arecibo today records is this same combined reading — tree, grass, weed and mold in one index.
The Arecibo allergy count today is 15 (Low) — the same Total Pollen Index as the pollen count above, in one combined reading.
Pollen count today Arecibo: the 5-day forecast
| Day | Total Pollen Index | Band |
|---|---|---|
| Thursday, November 5 | 15 | Low |
| Friday, November 6 | 20 | Low |
| Saturday, November 7 | 14 | Low |
| Sunday, November 8 | 14 | Low |
| Monday, November 9 | 9 | Low |
Pollen Atlas forecasts Arecibo’s pollen count to peak on Friday at 20 (Low) over the next 5 days.
Pollen by type in Arecibo
What is driving Arecibo’s pollen today
The shape of today’s 15 (Low) is set by weed pollen at 15 (Low on its own scale) — about 37% of the four category readings added together, 1 points clear of the next category, tree pollen at 14. 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 the PR calendar working as expected — November falls in the closing weeks of the state’s weed chapter.
Plant-level detail is not in today’s feed for Arecibo, 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 9 to 20, never changing band. Today’s 15 sits 1 point above the window’s average of 14.4 — a moving window, worth reading day by day rather than from the average.
Plants affecting Arecibo now
Detailed plant-by-plant readings for Arecibo 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 14 (Low).
Grass pollen is one of the categories with a non-zero reading today, at 12 (Low).
Weed pollen is one of the categories with a non-zero reading today, at 15 (Low).
In the Southeast pattern, the plants that typically shape this city’s year are spring trees, warm-season grasses and late-summer ragweed — 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.
Arecibo pollen through the year
Chapter by chapter, the Arecibo pollen year runs like this:
- Trees can start as early as February and peak in April.
- Grasses follow in May and run through the summer.
- Ragweed runs from mid-August to the first frost.
- Mold is the quiet fourth player, sustained by river-valley humidity between the pollen waves.
No PR allergy season guide is published yet, so this page does not single out signature pollens for Arecibo — the calendar above is the Southeast regional pattern, and the plant detail on this page names what today’s feed actually records.
November in Arecibo sits inside the weed chapter of the PR year, in its closing weeks — the part of the calendar today’s readings should be judged against. Between them, the three chapters cover 10 months of the PR year, February to November — a long season by national standards, with only a short quiet gap. No PR allergy season guide is published yet — this calendar follows the Southeast regional pattern. See Arecibo pollen count rankings and Arecibo on the pollen heatmap.
How to read this index
Pollen Atlas reports the Arecibo 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 Arecibo, PR 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.
Arecibo in today’s national picture
At 15 (Low), Arecibo ranks joint 66640th of the 90896 cities Pollen Atlas tracks today — in the middle of the national table. The highest reading in the country today is Serpa, Portugal at 53, and the lowest is Galiakberovo, Russia at 5. The whole table spans 48 points today — a wide-open day, when the top and bottom of the table are effectively in different seasons.
Around Arecibo: Corcovado comunidad, PR (3 miles away) reads 15 (Low); Rafael González comunidad, PR (4 miles away) reads 14 (Low); Carrizales comunidad, PR (4 miles away) reads 15 (Low). Arecibo reads exactly level with its nearest tracked neighbour today. Across PR’s 280 tracked cities, today runs from 9 in Fajardo to 21 in Santa Isabel zona urbana.
Pollen totals are population numbers; symptoms are personal. The same reading can leave one Arecibo resident untouched and floor another, depending on which pollens they are sensitised to. If this pattern finds you every ragweed season, allergists in Arecibo, PR 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.
Arecibo in its local area
Arecibo is in Arecibo Municipio, Puerto Rico. Its population is 40,255 (ACS 2023).
Across PR’s 280 tracked cities, Arecibo ranks joint 24th today.
Like every Pollen Atlas city page, the Arecibo, PR pollen count is refreshed each morning.
Nearby cities
- Corcovado comunidad pollen count (3 miles away)
- Rafael González comunidad pollen count (4 miles away)
- Carrizales comunidad pollen count (4 miles away)
- Bajadero comunidad pollen count (5 miles away)
- Rafael Capó comunidad pollen count (5 miles away)
- Hatillo zona urbana pollen count (6 miles away)
From Pollen Atlas News
See how Arecibo ranks in today's pollen count rankings — the worst cities for allergies today
See Arecibo on the US pollen map
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).