Redwood City, CA Pollen Count Today
Redwood City, 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).
Redwood City, CA
Weeds Index
How active weeds pollen is today (0–100).
Redwood City, CA
Pollen Types
Pick a pollen subtype to update the species forecast
5-Day Redwood City Overall Pollen Forecast
Bars are colored by severity (Low/Moderate/High).
This reading is the forecast point for Redwood City — 2 nearby places use the same point; Redwood City is 4.3 km from it.
Pollen count Redwood City residents check each morning
The Redwood City pollen count today is 26 (Low). The main driver is Ragweed, with weed pollen at 28 today. Tree pollen is the highest single category in the split at 29 (Low), ahead of weed pollen at 28 and grass pollen at 1. Plant-by-plant detail for Redwood City, CA follows, along with the outlook for the days ahead. 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 tree pollen, reading noticeably higher than the rest, which is why the split is printed on every Redwood City 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 Redwood City pollen forecast below — it is currently holding, with Saturday the highest day in the window.
This is the pollen count Redwood City residents check each morning, built from the day’s tree, grass, weed and mold readings.
What is the Redwood City pollen count today?
The Redwood City 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 Redwood City: this page is updated every morning with the day’s modelled reading.
Redwood City allergies today
Redwood City 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 Redwood City allergies, this is the number that answers them — one daily index built from today’s tree, grass, weed and mold readings for Redwood City.
Allergies in Redwood City 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 Redwood City 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 Redwood City allergy forecast: today reads 26 (Low), and the day-by-day outlook shows whether Redwood City 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 Redwood City today records is this same combined reading — tree, grass, weed and mold in one index.
The Redwood City allergy count today is 26 (Low) — the same Total Pollen Index as the pollen count above, in one combined reading.
Pollen count today Redwood City: the 5-day forecast
| Day | Total Pollen Index | Band |
|---|---|---|
| Saturday, November 7 | 26 | Low |
| Sunday, November 8 | 25 | Low |
| Monday, November 9 | 25 | Low |
| Tuesday, November 10 | 25 | Low |
| Wednesday, November 11 | 22 | Low |
Pollen Atlas forecasts Redwood City’s pollen count to peak on Saturday at 26 (Low) over the next 5 days.
Pollen by type in Redwood City
What is driving Redwood City’s pollen today
The shape of today’s 26 (Low) is set by tree pollen at 29 (Low on its own scale) — about 50% of the four category readings added together, 1 points clear of the next category, weed pollen at 28. Tree readings are the fastest-moving of the four in their season, because species pollinate in sequence — a tree-led total can change character within a week. Tree pollen leading in November runs against the usual calendar — the California tree chapter runs February to May — 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 Redwood City, 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 22 to 26, never changing band. Today’s 26 sits 1 point above the window’s average of 24.6 — a steady window, in which one day reads much like the next.
Plants affecting Redwood City now
Detailed plant-by-plant readings for Redwood City 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 29 (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 28 (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.
Redwood City pollen through the year
Chapter by chapter, the Redwood City pollen year runs like this:
- Trees build through spring, with planted olive peaking from March into May.
- Grasses peak in spring in the Central Valley and run longer and milder on the coast.
- 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 Redwood City 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 Redwood City, 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.
Redwood City in today’s national picture
At 26 (Low), Redwood City ranks joint 29974th 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 Redwood City: North Fair Oaks, CA (3 miles away) reads 26 (Low); San Carlos, CA (3 miles away) reads 24 (Low); Foster City, CA (4 miles away) reads 28 (Low). Redwood City 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 Redwood City resident untouched and floor another, depending on which pollens they are sensitised to. If this pattern finds you every season, allergists in Redwood City, 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.
Redwood City in its local area
Redwood City is a city in San Mateo County, California. Its population is 82,423 (ACS 2023).
Redwood City anchors the forecast-point group of 2 places that share this reading. Within the group, Redwood City ranks joint 1st; across California’s 1602 tracked cities, it ranks joint 197th today.
Like every Pollen Atlas city page, the Redwood City, CA pollen count is refreshed each morning.
Nearby cities
- North Fair Oaks pollen count (3 miles away)
- San Carlos pollen count (3 miles away)
- Foster City pollen count (4 miles away)
- Atherton pollen count (4 miles away)
- Menlo Park pollen count (4 miles away)
- Belmont pollen count (4 miles away)
From Pollen Atlas News
See how Redwood City ranks in today's pollen count rankings — the worst cities for allergies today
See Redwood City 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).