Merced, CA Pollen Count
Merced, CA · Last updated Friday, November 6, 2026
This page shows the most recent reading available for Merced — 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).
Merced, CA
Weeds Index
How active weeds pollen is today (0–100).
Merced, CA
Pollen Types
Pick a pollen subtype to update the species forecast
5-Day Merced Overall Pollen Forecast
Bars are colored by severity (Low/Moderate/High).
Pollen count Merced residents check each morning
The Merced pollen count today is 23 (Low). The main driver is Ragweed, with weed pollen at 27 today. The full split is tree pollen 19, grass pollen 1, weed pollen 27. 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 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 Merced 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 Merced pollen forecast below — it is currently mixed, with Friday the highest day in the window.
This is the pollen count Merced residents check each morning, built from the day’s tree, grass, weed and mold readings.
What is the Merced pollen count today?
The Merced pollen count today is 23 out of 100 (Low) on the Pollen Atlas Total Pollen Index, driven mainly by Ragweed.
Short answer for anyone searching pollen count today Merced: this page is updated every morning with the day’s modelled reading.
Merced allergies today
Merced allergies today are set by the same reading as the pollen count above: the Total Pollen Index is 23 (Low), driven mainly by Ragweed. When people ask about Merced allergies, this is the number that answers them — one daily index built from today’s tree, grass, weed and mold readings for Merced.
Allergies in Merced follow the California 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 Merced 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 Merced allergy forecast: today reads 23 (Low), and the day-by-day outlook shows whether Merced 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 Merced today records is this same combined reading — tree, grass, weed and mold in one index.
The Merced allergy count today is 23 (Low) — the same Total Pollen Index as the pollen count above, in one combined reading.
Pollen count today Merced: the 5-day forecast
| Day | Total Pollen Index | Band |
|---|---|---|
| Friday, November 6 | 23 | Low |
| Saturday, November 7 | 21 | Low |
| Sunday, November 8 | 23 | Low |
| Monday, November 9 | 23 | Low |
| Tuesday, November 10 | 22 | Low |
Pollen Atlas forecasts Merced’s pollen count to peak on Friday at 23 (Low) over the next 5 days.
Pollen by type in Merced
What is driving Merced’s pollen today
The shape of today’s 23 (Low) is set by weed pollen at 27 (Low on its own scale) — about 57% of the four category readings added together, 8 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 runs against the usual calendar — the California weed chapter runs August to October — so today’s lead is the model outranking the pattern, and this page reports the modelled reading first.
Plant-level detail is not in today’s feed for Merced, so the drivers have to be read from the category split above. The California guide’s account of California names planted olive and the Central Valley’s concentrated spring pollen — 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 21 to 23, never changing band. Today’s 23 sits 1 point above the window’s average of 22.4 — a steady window, in which one day reads much like the next.
Plants affecting Merced now
Detailed plant-by-plant readings for Merced 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 1 (Low).
Weed pollen is one of the categories with a non-zero reading today, at 27 (Low).
In the California pattern, the plants that typically shape this city’s year are winter and spring trees, late-spring grasses and late-summer weeds — 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.
Merced pollen through the year
The Merced pollen year runs in chapters, set by its own pattern and the California calendar. Trees come first: trees build through spring, with planted olive peaking from March into May. Grasses take the middle of the year: grasses peak in spring in the Central Valley and run longer and milder on the coast. Weeds close it out: weeds follow in late summer and fall, stronger after wet winters.
The California allergy season guide names planted olive and the Central Valley’s concentrated spring pollen. There is no single California season: the Central Valley records some of the state’s sharpest spring peaks, trapped and concentrated by valley geography, while the coast runs long and mild. The AAFA’s 2025 Allergy Capitals research noted upward movement for several California cities, attributed to grass and weed pollen after wet weather.
November falls between the main chapters of the California pollen year — the tail of one and the approach of the next — so the calendar alone explains little today, and the modelled split above carries the story. Between them, the three chapters cover 9 months of the California year, February to October — leaving a quiet gap of roughly 3 months in the depth of the off-season. The full calendar is set out in the California allergy season guide.
How to read this index
Pollen Atlas reports the Merced 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 Merced, CA 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.
Merced in today’s national picture
At 23 (Low), Merced ranks joint 41692nd 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 Merced: Bear Creek, CA (3 miles away) reads 22 (Low); Franklin, CA (4 miles away) reads 23 (Low); University of California-Merced, CA (5 miles away) reads 21 (Low). Merced reads 1 point higher than its nearest tracked neighbour today. Across California’s 1602 tracked cities, today runs from 5 in Truckee to 42 in Mecca.
Pollen totals are population numbers; symptoms are personal. The same reading can leave one Merced resident untouched and floor another, depending on which pollens they are sensitised to. If this pattern finds you every season, allergists in Merced, CA 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.
Merced in its local area
Merced is a city in Merced County, California. Its population is 89,766 (ACS 2023).
Across California’s 1602 tracked cities, Merced ranks joint 620th today.
Like every Pollen Atlas city page, the Merced, CA pollen count is refreshed each morning.
Nearby cities
- Bear Creek pollen count (3 miles away)
- Franklin pollen count (4 miles away)
- University of California-Merced pollen count (5 miles away)
- Tuttle pollen count (5 miles away)
- McSwain pollen count (6 miles away)
- Atwater pollen count (8 miles away)
From Pollen Atlas News
See how Merced ranks in today's pollen count rankings — the worst cities for allergies today
See Merced 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).