Yokohama, Japan Pollen Count
Yokohama, Japan · Last updated Friday, November 6, 2026
This page shows the most recent reading available for Yokohama — 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).
Yokohama, Japan
Weeds Index
How active weeds pollen is today (0–100).
Yokohama, Japan
Pollen Types
Pick a pollen subtype to update the species forecast
5-Day Yokohama Overall Pollen Forecast
Bars are colored by severity (Low/Moderate/High).
Pollen count Yokohama residents check each morning
The Yokohama pollen count today is 23 (Low). The main driver is Ragweed, with weed pollen at 27 today. The full split is tree pollen 19, grass pollen 3, weed pollen 27. 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 Yokohama 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 Yokohama pollen forecast below — it is currently mixed, with Friday the highest day in the window.
This is the pollen count Yokohama residents check each morning, built from the day’s tree, grass, weed and mold readings.
What is the Yokohama pollen count today?
The Yokohama pollen count today is 23 out of 100 (Low) on the Pollen Atlas Total Pollen Index, driven mainly by Ragweed.
Short answer for anyone searching pollen count today Yokohama: this page is updated every morning with the day’s modelled reading.
Yokohama allergies today
Yokohama allergies today are set by the same reading as the pollen count above: the Total Pollen Index is 23 (Low), driven mainly by Ragweed. When people ask about Yokohama allergies, this is the number that answers them — one daily index built from today’s tree, grass, weed and mold readings for Yokohama.
Allergies in Yokohama follow the Japan 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 Yokohama 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 Yokohama allergy forecast: today reads 23 (Low), and the day-by-day outlook shows whether Yokohama 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 Yokohama today records is this same combined reading — tree, grass, weed and mold in one index.
The Yokohama allergy count today is 23 (Low) — the same Total Pollen Index as the pollen count above, in one combined reading.
Pollen count today Yokohama: the 5-day forecast
| Day | Total Pollen Index | Band |
|---|---|---|
| Friday, November 6 | 23 | Low |
| Saturday, November 7 | 10 | Low |
| Sunday, November 8 | 15 | Low |
| Monday, November 9 | 22 | Low |
| Tuesday, November 10 | 22 | Low |
Pollen Atlas forecasts Yokohama’s pollen count to peak on Friday at 23 (Low) over the next 5 days.
Pollen by type in Yokohama
What is driving Yokohama’s pollen today
The shape of today’s 23 (Low) is set by weed pollen at 27 (Low on its own scale) — about 55% of the four category readings added together, 8 points clear of the next category, tree pollen at 19. 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 is a modelled reading, reported as modelled — no regional calendar is asserted for Japan, and the modelled value outranks any general seasonal expectation.
Plant-level detail is not in today’s feed for Yokohama, so the drivers have to be read from the category split above — it shows how much of today’s total each category is actually carrying, and plant detail returns here automatically on any day the feed includes it.
Across the five-day window the Total Pollen Index runs from 10 to 23, never changing band. Today’s 23 sits 5 points above the window’s average of 18.4 — a moving window, worth reading day by day rather than from the average.
Plants affecting Yokohama now
Detailed plant-by-plant readings for Yokohama 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 19 (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 27 (Low).
In the Global pattern, the plants that shape this city’s year vary with its local climate and vegetation, and no single regional calendar is published for this area — 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.
Yokohama pollen through the year
The Yokohama pollen year runs in chapters, set by the Global pattern and the Japan calendar. Trees come first: tree pollen seasons vary with local climate and vegetation, so this page reports the measured readings first and treats any calendar as background only. Grasses take the middle of the year: grass pollen seasons vary with local climate and vegetation, and the measured value outranks any general seasonal expectation. Weeds close it out: weed pollen seasons vary with local climate and vegetation, and no regional calendar is asserted for this area.
No Japan allergy season guide is published yet, so this page does not single out signature pollens for Yokohama — the calendar above is the Global regional pattern, and the plant detail on this page names what today’s feed actually records.
November in Yokohama is reported from its modelled readings, not from a regional calendar — no regional calendar is asserted for Japan, so the calendar alone explains little today, and the modelled split above carries the story. No Japan allergy season guide is published yet — this calendar follows the Global regional pattern. See Yokohama pollen count rankings and Yokohama on the pollen heatmap.
How to read this index
Pollen Atlas reports the Yokohama 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 Yokohama, Japan 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.
Yokohama in today’s national picture
At 23 (Low), Yokohama ranks joint 40203rd 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 Yokohama: Kawasaki, Japan (11 km away) reads 25 (Low); Ōta, Japan (15 km away) reads 25 (Low); Yokosuka, Japan (17 km away) reads 18 (Low). Yokohama reads 2 points lower than its nearest tracked neighbour today. Across Japan’s 131 tracked cities, today runs from 5 in Sapporo to 31 in Kawagoe.
Pollen totals are population numbers; symptoms are personal. The same reading can leave one Yokohama resident untouched and floor another, depending on which pollens they are sensitised to. If this pattern finds you every season, allergists in Yokohama, Japan 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.
Yokohama in its local area
Yokohama is in Yokohama Shi, Kanagawa, Japan. Its population is 3,777,491 (GeoNames).
Across Japan’s 131 tracked cities, Yokohama ranks joint 45th today.
Like every Pollen Atlas city page, the Yokohama, Japan pollen count is refreshed each morning.
Nearby cities
- Kawasaki pollen count (11 km away)
- Ōta pollen count (15 km away)
- Yokosuka pollen count (17 km away)
- Yamato pollen count (19 km away)
- Minamirinkan pollen count (20 km away)
- Chigasaki pollen count (25 km away)
From Pollen Atlas News
See how Yokohama 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).