South Pasadena, CA Pollen Count

What is the South Pasadena pollen count today?

The South Pasadena pollen count today is 25 out of 100 (Low) on the Pollen Atlas Total Pollen Index, driven mainly by Ragweed.

Short answer for anyone searching pollen count today South Pasadena: this page is updated every morning with the day’s modelled reading.

South Pasadena allergies today

South Pasadena allergies today are set by the same reading as the pollen count above: the Total Pollen Index is 25 (Low), driven mainly by Ragweed. When people ask about South Pasadena allergies, this is the number that answers them — one daily index built from today’s tree, grass, weed and mold readings for South Pasadena.

Allergies in South Pasadena 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 South Pasadena 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 South Pasadena allergy forecast: today reads 25 (Low), and the day-by-day outlook shows whether South Pasadena 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 South Pasadena today records is this same combined reading — tree, grass, weed and mold in one index.

The South Pasadena allergy count today is 25 (Low) — the same Total Pollen Index as the pollen count above, in one combined reading.

Pollen count today South Pasadena: the 5-day forecast

Pollen Atlas forecasts South Pasadena’s pollen count to peak on Friday at 25 (Low) over the next 5 days.

Pollen by type in South Pasadena

• South Pasadena tree pollen count
• South Pasadena grass pollen count
• South Pasadena ragweed pollen count

What is driving South Pasadena’s pollen today

The shape of today’s 25 (Low) is set by weed pollen at 28 (Low on its own scale) — about 47% of the four category readings added together, 1 points clear of the next category, tree pollen at 27. 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 South Pasadena, 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 25, never changing band. Today’s 25 sits 1 point above the window’s average of 23.6 — a steady window, in which one day reads much like the next.

Plants affecting South Pasadena now

Detailed plant-by-plant readings for South Pasadena 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 27 (Low).

Grass pollen is one of the categories with a non-zero reading today, at 5 (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.

South Pasadena pollen through the year

The South Pasadena 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 South Pasadena 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 South Pasadena, 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.

South Pasadena in today’s national picture

At 25 (Low), South Pasadena ranks joint 36055th 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 South Pasadena: Alhambra, CA (2 miles away) reads 25 (Low); San Marino, CA (3 miles away) reads 25 (Low); San Gabriel, CA (3 miles away) reads 25 (Low). South Pasadena 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 South Pasadena resident untouched and floor another, depending on which pollens they are sensitised to. If this pattern finds you every season, allergists in South Pasadena, 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.

South Pasadena in its local area

South Pasadena is a city in Los Angeles County, California. Its population is 26,297 (ACS 2023).

Across California’s 1602 tracked cities, South Pasadena ranks joint 415th today.

Like every Pollen Atlas city page, the South Pasadena, CA pollen count is refreshed each morning.

Nearby cities

• Alhambra pollen count (2 miles away)
• San Marino pollen count (3 miles away)
• San Gabriel pollen count (3 miles away)
• Pasadena pollen count (4 miles away)
• San Pasqual pollen count (4 miles away)
• Monterey Park pollen count (4 miles away)

From Pollen Atlas News

• California allergy season
• Ragweed season