San Luis, AZ Pollen Count
San Luis, AZ · Last updated Friday, November 6, 2026
This page shows the most recent reading available for San Luis — from Friday, November 6, 2026 (1 day 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).
San Luis, AZ
Weeds Index
How active weeds pollen is today (0–100).
San Luis, AZ
Pollen Types
Pick a pollen subtype to update the species forecast
5-Day San Luis Overall Pollen Forecast
Bars are colored by severity (Low/Moderate/High).
Pollen count San Luis residents check each morning
The San Luis pollen count today is 26 (Low). The main driver is Ragweed, with weed pollen at 31 today. That total sits on a narrow base: weed pollen is 31 while tree pollen is just 19 and grass pollen 4. Plant-by-plant detail for San Luis, AZ follows, along with the outlook for the days ahead. Pollen Atlas updated this count on Friday, November 6, 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 Luis page.
Desert Southwest pollen does not follow a single national calendar. Arid conditions limit some pollen types for much of the year, while irrigated urban landscaping introduces trees and grasses that would not otherwise grow in the desert, and wind can move pollen across an open landscape efficiently. Readings in this region in particular should be judged against their own split and their own recent days, not against humid-region expectations: a low total here reflects today’s modelled categories, whatever the month.
To see whether today’s pollen level holds, check the 5-day San Luis pollen forecast below — it is currently holding, with Friday the highest day in the window.
This is the pollen count San Luis residents check each morning, built from the day’s tree, grass, weed and mold readings.
What is the San Luis pollen count today?
The San Luis pollen count today is 26 out of 100 (Low) on the Pollen Atlas Total Pollen Index, driven mainly by Ragweed.
Short answer for anyone searching pollen count today San Luis: this page is updated every morning with the day’s modelled reading.
San Luis allergies today
San Luis allergies today are set by the same reading as the pollen count above: the Total Pollen Index is 26 (Low), driven mainly by Ragweed. When people ask about San Luis allergies, this is the number that answers them — one daily index built from today’s tree, grass, weed and mold readings for San Luis.
Allergies in San Luis follow the Arizona 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 Luis 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 Luis allergy forecast: today reads 26 (Low), and the day-by-day outlook shows whether San Luis 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 Luis today records is this same combined reading — tree, grass, weed and mold in one index.
The San Luis allergy count today is 26 (Low) — the same Total Pollen Index as the pollen count above, in one combined reading.
Pollen count today San Luis: the 5-day forecast
| Day | Total Pollen Index | Band |
|---|---|---|
| Friday, November 6 | 26 | Low |
| Saturday, November 7 | 26 | Low |
| Sunday, November 8 | 26 | Low |
| Monday, November 9 | 26 | Low |
| Tuesday, November 10 | 26 | Low |
Pollen Atlas forecasts San Luis’s pollen count to peak on Friday at 26 (Low) over the next 5 days.
Pollen by type in San Luis
What is driving San Luis’s pollen today
The shape of today’s 26 (Low) is set by weed pollen at 31 (Low on its own scale) — about 57% of the four category readings added together, 12 points clear of the next category, tree pollen at 19. 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 Arizona 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 San Luis, so the drivers have to be read from the category split above. The Arizona guide’s account of Arizona names mulberry, ash and olive — planted trees, not wild desert flora — the pollens behind readings of this shape in this state — and the split shows how much of today’s total each category is actually carrying.
Across the five-day window the Total Pollen Index runs from 26 to 26, never changing band. Today’s 26 sits level with the window’s average of 26 — a steady window, in which one day reads much like the next.
Plants affecting San Luis now
Detailed plant-by-plant readings for San Luis 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 4 (Low).
Weed pollen is one of the categories with a non-zero reading today, at 31 (Low).
In the Desert Southwest pattern, the plants that typically shape this city’s year are irrigated landscape trees and grasses, with wind-carried weeds in open ground — 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 Luis pollen through the year
Chapter by chapter, the San Luis pollen year runs like this:
- Planted trees open in winter — the juniper family and ash first, mulberry at the heart of spring.
- Irrigated Bermuda grass runs long rather than intense, across much of the warm season.
- A final weed wave follows the monsoon rains into fall, with monsoon mold in the same weeks.
The Arizona allergy season guide names mulberry, ash and olive — planted trees, not wild desert flora. Arizona’s season arrives in waves shaped by desert botany and desert weather, with a midsummer heat lull and a mold bump when the monsoon breaks. Phoenix and Tucson often peak weeks apart: Tucson sits at roughly 2,400 feet against Phoenix’s 1,100, and its cooler nights delay its tree wave by a matter of weeks.
November in San Luis sits in the overlap of the grass and weed chapters of the Arizona year — overlap weeks, when two chapters feed the same total and the split matters more than the headline. Between them, the three chapters cover 11 months of the Arizona year, January to November — a long season by national standards, with only a short quiet gap. The full calendar is set out in the Arizona allergy season guide.
How to read this index
Pollen Atlas reports the San Luis 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 whatever the month. 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 Luis in today’s national picture
At 26 (Low), San Luis ranks joint 32701st 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 San Luis: San Luis Río Colorado, Mexico (4 miles away) reads 23 (Low); Gadsden, AZ (6 miles away) reads 33 (Low); Somerton, AZ (8 miles away) reads 33 (Low). San Luis reads 3 points higher than its nearest tracked neighbour today. Across Arizona’s 465 tracked cities, today runs from 5 in Fort Valley to 36 in Rillito.
Pollen totals are population numbers; symptoms are personal. The same reading can leave one San Luis resident untouched and floor another, depending on which pollens they are sensitised to. If this pattern finds you every ragweed season, allergists in San Luis, AZ 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 Luis in its local area
San Luis is a city in Yuma County, Arizona. Its population is 35,998 (ACS 2023).
Across Arizona’s 465 tracked cities, San Luis ranks joint 84th today.
Like every Pollen Atlas city page, the San Luis, AZ pollen count is refreshed each morning.
Nearby cities
- Gadsden pollen count (6 miles away)
- Somerton pollen count (8 miles away)
- Rancho Mesa Verde pollen count (8 miles away)
- Orange Grove Mobile Manor pollen count (9 miles away)
- Drysdale pollen count (11 miles away)
- Yuma pollen count (12 miles away)
From Pollen Atlas News
See how San Luis 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).