St. Peters, MO Pollen Count
St. Peters, MO · Last updated Friday, November 6, 2026
This page shows the most recent reading available for St. Peters — 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).
St. Peters, MO
Weeds Index
How active weeds pollen is today (0–100).
St. Peters, MO
Pollen Types
Pick a pollen subtype to update the species forecast
5-Day St. Peters Overall Pollen Forecast
Bars are colored by severity (Low/Moderate/High).
This reading is the forecast point for St. Peters — 2 nearby places use the same point; St. Peters is 2.8 km from it.
Pollen count St. Peters residents check each morning
The St. Peters pollen count today is 20 (Low). The main driver is Ragweed, with weed pollen at 26 today. The full split is tree pollen 0.6, grass pollen 3, weed pollen 26. 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 St. Peters 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. In the Plains and around the Great Lakes, ragweed is a familiar late-season plant of open ground, field edges and disturbed soil, which is why it so often leads inland autumn readings.
To see whether today’s pollen level holds, check the 5-day St. Peters pollen forecast below — it is currently holding, with Friday the highest day in the window.
This is the pollen count St. Peters residents check each morning, built from the day’s tree, grass, weed and mold readings.
What is the St. Peters pollen count today?
The St. Peters pollen count today is 20 out of 100 (Low) on the Pollen Atlas Total Pollen Index, driven mainly by Ragweed.
Short answer for anyone searching pollen count today St. Peters: this page is updated every morning with the day’s modelled reading.
St. Peters allergies today
St. Peters allergies today are set by the same reading as the pollen count above: the Total Pollen Index is 20 (Low), driven mainly by Ragweed. When people ask about St. Peters allergies, this is the number that answers them — one daily index built from today’s tree, grass, weed and mold readings for St. Peters.
Allergies in St. Peters follow the Missouri 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 St. Peters 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 St. Peters allergy forecast: today reads 20 (Low), and the day-by-day outlook shows whether St. Peters 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 St. Peters today records is this same combined reading — tree, grass, weed and mold in one index.
The St. Peters allergy count today is 20 (Low) — the same Total Pollen Index as the pollen count above, in one combined reading.
Pollen count today St. Peters: the 5-day forecast
| Day | Total Pollen Index | Band |
|---|---|---|
| Friday, November 6 | 20 | Low |
| Saturday, November 7 | 20 | Low |
| Sunday, November 8 | 19 | Low |
| Monday, November 9 | 19 | Low |
| Tuesday, November 10 | 19 | Low |
Pollen Atlas forecasts St. Peters’s pollen count to peak on Friday at 20 (Low) over the next 5 days.
Pollen by type in St. Peters
What is driving St. Peters’s pollen today
The shape of today’s 20 (Low) is set by weed pollen at 26 (Low on its own scale) — about 88% of the four category readings added together, 23 points clear of the next category, grass pollen at 3. 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 Missouri 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 St. Peters, so the drivers have to be read from the category split above. The Missouri guide’s account of Missouri names oak and hickory over an elm and maple opening, in a season written by the state’s rivers — 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 19 to 20, never changing band. Today’s 20 sits 1 point above the window’s average of 19.4 — a steady window, in which one day reads much like the next.
Plants affecting St. Peters now
Detailed plant-by-plant readings for St. Peters 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 0.6 (Low).
Grass pollen is one of the categories with a non-zero reading today, at 3 (Low).
Weed pollen is one of the categories with a non-zero reading today, at 26 (Low).
In the South-Central Plains pattern, the plants that typically shape this city’s year are spring trees, prairie 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.
St. Peters pollen through the year
The St. Peters pollen year runs in chapters, set by the South-Central Plains pattern and the Missouri calendar. Trees come first: river-corridor trees open from February — elm and maple first, then oak and hickory. Grasses take the middle of the year: prairie grasses take over in late May and hold the summer. Weeds close it out: ragweed builds from mid-August to the first hard frost, carried county to county by plains wind. Mold shares the long middle of the year, fed by river-bottom humidity.
The Missouri allergy season guide names oak and hickory over an elm and maple opening, in a season written by the state’s rivers. Missouri’s rivers write its season: the bottoms grow the weeds, plains winds move the grass, and oak-and-hickory highlands frame the map. The Bootheel runs on a Memphis schedule rather than a Kansas City one: springs start earlier there, and its ragweed season can outlast the rest of the state’s by weeks.
November falls between the main chapters of the Missouri 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 Missouri 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 Missouri allergy season guide.
How to read this index
Pollen Atlas reports the St. Peters 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 St. Peters, MO 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.
St. Peters in today’s national picture
At 20 (Low), St. Peters ranks joint 50794th 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 St. Peters: Cottleville, MO (4 miles away) reads 19 (Low); St. Charles, MO (5 miles away) reads 20 (Low); Weldon Spring, MO (6 miles away) reads 21 (Low). St. Peters reads 1 point higher than its nearest tracked neighbour today. Across Missouri’s 1082 tracked cities, today runs from 12 in Camdenton to 32 in Portage Des Sioux.
Pollen totals are population numbers; symptoms are personal. The same reading can leave one St. Peters resident untouched and floor another, depending on which pollens they are sensitised to. If this pattern finds you every season, allergists in St. Peters, MO 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.
St. Peters in its local area
St. Peters is a city in St. Charles County, Missouri. Its population is 58,200 (ACS 2023).
St. Peters anchors the forecast-point group of 2 places that share this reading. Within the group, St. Peters ranks 2nd; across Missouri’s 1082 tracked cities, it ranks joint 619th today.
Like every Pollen Atlas city page, the St. Peters, MO pollen count is refreshed each morning.
Nearby cities
- Cottleville pollen count (4 miles away)
- St. Charles pollen count (5 miles away)
- Weldon Spring pollen count (6 miles away)
- O'Fallon pollen count (6 miles away)
- Dardenne Prairie pollen count (7 miles away)
- Weldon Spring Heights pollen count (7 miles away)
From Pollen Atlas News
See how St. Peters 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).