Pollen today
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Pollen today
Loading today’s values…
Google gave no index for tree, grass or weed pollen here today.
Next four days, highest level each day:
Source: Includes pollen data from GoogleGoogle Maps
Source: Includes pollen data from GoogleIncludes data from Google Maps
Google’s index for each plant it models in St. Louis today. A plant out of season has no index.
Source: Includes pollen data from GoogleGoogle Maps
The forecast that moves pollen around, and the air beside it.
Forecast: National Weather Service, updated 1:01 pm CT.
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Each thread is one kind of pollen, and each square is one week, colored by that week’s highest level.
Records for St. Louis began on October 14, 2026. Each week adds a square.
Highest level each week, November 2025 to November 2026, from each day’s forecast.
| Week | Tree | Grass | Weed |
|---|---|---|---|
| Oct 28 to Nov 3 | Not recorded | Not recorded | 2 Low |
| Oct 21 to Oct 27 | Not recorded | Not recorded | 2 Low |
| Oct 14 to Oct 20 | Not recorded | Not recorded | 3 Moderate |
Source: Includes pollen data from GoogleIncludes data from Google Maps
What this forecast doesn’t measure, and when to get help.
Google’s index covers tree, grass and weed pollen only, so there is no mold level for St. Louis on this page. The National Allergy Bureau publishes pollen and mold counts measured at its stations. Our guides cover common molds such as Alternaria, Cladosporium and Aspergillus.
The forecast doesn’t cover allergens indoors either: dust mites, cockroaches, mice, cats and dogs. Our guides explain each one, starting with dust mites and cats.
An estimated 11.8% of adults in the city of St. Louis have current asthma, according to the CDC’s PLACES estimate for 2023 (95% confidence interval: 10.6% to 13.2%). It is a statistical estimate from national survey data, not a count.
60 allergists enrolled in Medicare practice in the St. Louis area: 2.13 for every 100,000 people, more than the 1.22 across the US. The count doesn’t show how soon you can get an appointment. See the doctors listed in the St. Louis area, or how every state and metro compares.
AllergyNest count from CMS’s Doctors and Clinicians file (October 2026) and Census population estimates for 2025.
The geography, climate and plants behind each season here, with a source for every fact.
Daily pollen and mold reports for the St. Louis area have come from Saint Louis County’s public health laboratories since 1960.2 A Burkard spore trap on the roof of a centrally located county building samples the air continuously over each 24-hour period.3 The reports track tree pollen types including alder, maple, elm, sweetgum, sycamore and willow, along with grass, sedge and weeds.2
Trees typically pollinate first, from February to May, grasses follow from May to mid-July, and weeds peak from late summer to early fall.3 Oaks outrank any other group of trees in Missouri forests in number of species, and the center gives oak pollen season as March to May.4 Among Missouri grasses, it lists timothy from June to July and crabgrass from July to November.5
The center says ragweed blooms from mid-July to September, and that its pollen increases with heavy spring rain and a hot, dry pollen season.6 A typical year at Lambert airport brings about 42 inches of precipitation and about 215 days between the last spring freeze and the first fall freeze.1
Answered from the values on this page.
Very little. None of the plants Google models is above 0 in St. Louis today.
No. It’s Google’s modeled pollen index, from 0 (none) to 5 (very high), calculated for the location of central St. Louis. A pollen count is the number of pollen grains measured in a cubic meter of air at a counting station. How our pollen index works.
Twice a day. We fetch new values soon after midnight in St. Louis, so each day starts with its own values, and again after Google’s daily model run, usually by about 9:30 am CT. Each section shows when its values were retrieved.
Since October 14, 2026. The year in pollen above fills in as each day is recorded, and weeks before then show no data. Google doesn’t provide past values, so nothing earlier can be added.
Source: Includes pollen data from GoogleIncludes data from Google Maps