Lake San Marcos, CA Pollen Count Today
Lake San Marcos, CA · 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).
Lake San Marcos, CA
Weeds Index
How active weeds pollen is today (0–100).
Lake San Marcos, CA
Pollen Types
Pick a pollen subtype to update the species forecast
5-Day Lake San Marcos Overall Pollen Forecast
Bars are colored by severity (Low/Moderate/High).
Pollen count Lake San Marcos residents check each morning
The Lake San Marcos pollen count today is 24 (Low). The main driver is Ragweed, with weed pollen at 27 today. Weed pollen leads the split at 27 (Low on its own scale), followed by tree pollen at 20 and grass pollen at 4. Below, the plant detail and the multi-day outlook show whether today is the pattern or the exception. 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 Lake San Marcos 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 Lake San Marcos pollen forecast below — it is currently holding, with Saturday the highest day in the window.
This is the pollen count Lake San Marcos residents check each morning, built from the day’s tree, grass, weed and mold readings.
What is the Lake San Marcos pollen count today?
The Lake San Marcos pollen count today is 24 out of 100 (Low) on the Pollen Atlas Total Pollen Index, driven mainly by Ragweed.
Short answer for anyone searching pollen count today Lake San Marcos: this page is updated every morning with the day’s modelled reading.
Lake San Marcos allergies today
Lake San Marcos allergies today are set by the same reading as the pollen count above: the Total Pollen Index is 24 (Low), driven mainly by Ragweed. When people ask about Lake San Marcos allergies, this is the number that answers them — one daily index built from today’s tree, grass, weed and mold readings for Lake San Marcos.
Allergies in Lake San Marcos 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 Lake San Marcos 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 Lake San Marcos allergy forecast: today reads 24 (Low), and the day-by-day outlook shows whether Lake San Marcos 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 Lake San Marcos today records is this same combined reading — tree, grass, weed and mold in one index.
The Lake San Marcos allergy count today is 24 (Low) — the same Total Pollen Index as the pollen count above, in one combined reading.
Pollen count today Lake San Marcos: the 5-day forecast
| Day | Total Pollen Index | Band |
|---|---|---|
| Saturday, November 7 | 24 | Low |
| Sunday, November 8 | 23 | Low |
| Monday, November 9 | 23 | Low |
| Tuesday, November 10 | 23 | Low |
| Wednesday, November 11 | 23 | Low |
Pollen Atlas forecasts Lake San Marcos’s pollen count to peak on Saturday at 24 (Low) over the next 5 days.
Pollen by type in Lake San Marcos
What is driving Lake San Marcos’s pollen today
The shape of today’s 24 (Low) is set by weed pollen at 27 (Low on its own scale) — about 53% of the four category readings added together, 7 points clear of the next category, tree pollen at 20. 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 Lake San Marcos, 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 23 to 24, never changing band. Today’s 24 sits 1 point above the window’s average of 23.2 — a steady window, in which one day reads much like the next.
Plants affecting Lake San Marcos now
Detailed plant-by-plant readings for Lake San Marcos 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 20 (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 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.
Lake San Marcos pollen through the year
Three chapters make the California pollen year, and Lake San Marcos follows them in the state’s own order. The tree chapter: trees build through spring, with planted olive peaking from March into May. The grass chapter: grasses peak in spring in the Central Valley and run longer and milder on the coast. The weed chapter: weeds follow in late summer and fall, stronger after wet winters.
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. The California guide singles out planted olive and the Central Valley’s concentrated spring pollen.
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 Lake San Marcos 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 Lake San Marcos, 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.
Lake San Marcos in today’s national picture
At 24 (Low), Lake San Marcos ranks joint 37388th 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 Lake San Marcos: San Marcos, CA (2 miles away) reads 24 (Low); Elfin Forest, CA (3 miles away) reads 24 (Low); Harmony Grove, CA (4 miles away) reads 25 (Low). Lake San Marcos reads exactly level with 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 Lake San Marcos resident untouched and floor another, depending on which pollens they are sensitised to. If this pattern finds you every season, allergists in Lake San Marcos, 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.
Lake San Marcos in its local area
Across California’s 1602 tracked cities, Lake San Marcos ranks joint 437th today.
Like every Pollen Atlas city page, the Lake San Marcos, CA pollen count is refreshed each morning.
Nearby cities
- San Marcos pollen count (2 miles away)
- Elfin Forest pollen count (3 miles away)
- Harmony Grove pollen count (4 miles away)
- Carlsbad pollen count (4 miles away)
- Vista pollen count (5 miles away)
- Encinitas pollen count (6 miles away)
From Pollen Atlas News
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).