Port Jefferson, NY Pollen Count Today
Port Jefferson, NY · 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).
Port Jefferson, NY
Weeds Index
How active weeds pollen is today (0–100).
Port Jefferson, NY
Pollen Types
Pick a pollen subtype to update the species forecast
5-Day Port Jefferson Overall Pollen Forecast
Bars are colored by severity (Low/Moderate/High).
Pollen count Port Jefferson residents check each morning
The Port Jefferson pollen count today is 6 (Low). The main driver is Ragweed, with weed pollen at 8 today. That total sits on a narrow base: weed pollen is 8 while tree pollen is just 0.6 and grass pollen 1. Plant-by-plant detail for Port Jefferson, NY 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 weed pollen or mold, reading noticeably higher than the rest, which is why the split is printed on every Port Jefferson 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 Northeast, autumn weed pollen typically winds down as colder nights arrive, so late-season totals can change quickly from week to week.
To see whether today’s pollen level holds, check the 5-day Port Jefferson pollen forecast below — it is currently mixed, with Sunday the highest day in the window.
This is the pollen count Port Jefferson residents check each morning, built from the day’s tree, grass, weed and mold readings.
What is the Port Jefferson pollen count today?
The Port Jefferson pollen count today is 6 out of 100 (Low) on the Pollen Atlas Total Pollen Index, driven mainly by Ragweed.
Short answer for anyone searching pollen count today Port Jefferson: this page is updated every morning with the day’s modelled reading.
Port Jefferson allergies today
Port Jefferson allergies today are set by the same reading as the pollen count above: the Total Pollen Index is 6 (Low), driven mainly by Ragweed. When people ask about Port Jefferson allergies, this is the number that answers them — one daily index built from today’s tree, grass, weed and mold readings for Port Jefferson.
Allergies in Port Jefferson follow the New York 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 Port Jefferson 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 Port Jefferson allergy forecast: today reads 6 (Low), and the day-by-day outlook shows whether Port Jefferson 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 Port Jefferson today records is this same combined reading — tree, grass, weed and mold in one index.
The Port Jefferson allergy count today is 6 (Low) — the same Total Pollen Index as the pollen count above, in one combined reading.
Pollen count today Port Jefferson: the 5-day forecast
| Day | Total Pollen Index | Band |
|---|---|---|
| Saturday, November 7 | 6 | Low |
| Sunday, November 8 | 15 | Low |
| Monday, November 9 | 12 | Low |
| Tuesday, November 10 | 12 | Low |
| Wednesday, November 11 | 15 | Low |
Pollen Atlas forecasts Port Jefferson’s pollen count to peak on Sunday at 15 (Low) over the next 5 days.
Pollen by type in Port Jefferson
What is driving Port Jefferson’s pollen today
The shape of today’s 6 (Low) is set by weed pollen at 8 (Low on its own scale) — about 83% of the four category readings added together, 7 points clear of the next category, grass pollen at 1. 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 New York 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 Port Jefferson, so the drivers have to be read from the category split above. The New York guide’s account of New York names birch and oak, preceded by elm and maple — 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 6 to 15, never changing band. Today’s 6 sits 6 points below the window’s average of 12 — a moving window, worth reading day by day rather than from the average.
Plants affecting Port Jefferson now
Detailed plant-by-plant readings for Port Jefferson 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 1 (Low).
Weed pollen is one of the categories with a non-zero reading today, at 8 (Low).
In the Northeast pattern, the plants that typically shape this city’s year are spring trees, late-spring 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.
Port Jefferson pollen through the year
Chapter by chapter, the Port Jefferson pollen year runs like this:
- Trees open in late March and build to an oak-led peak in May.
- Grasses hold from late May into July.
- Ragweed builds from mid-August, peaks in September, and is ended by the first hard frost.
- Mold tracks the region’s humidity rather than a flowering calendar, and it fills the gaps between chapters.
The New York allergy season guide names birch and oak, preceded by elm and maple. New York City’s tree season typically opens one to three weeks ahead of Rochester’s, where Lake Ontario’s cold air delays spring along the shore. The AAFA’s 2025 report ranked New York City in the less-challenging half of its 100 metros, reflecting moderate overall burden despite a real spring peak.
November falls between the main chapters of the New York 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 8 months of the New York year, March to October — a compressed season, which is why its chapters arrive in quick succession. The full calendar is set out in the New York allergy season guide.
How to read this index
Pollen Atlas reports the Port Jefferson 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 Port Jefferson, NY 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.
Port Jefferson in today’s national picture
At 6 (Low), Port Jefferson ranks joint 85200th 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 Port Jefferson: Port Jefferson Station, NY (1 miles away) reads 6 (Low); Belle Terre, NY (1 miles away) reads 6 (Low); Mount Sinai, NY (2 miles away) reads 6 (Low). Port Jefferson reads exactly level with its nearest tracked neighbour today. Across New York’s 1289 tracked cities, today runs from 5 in Union to 31 in Walden.
Pollen totals are population numbers; symptoms are personal. The same reading can leave one Port Jefferson resident untouched and floor another, depending on which pollens they are sensitised to. If this pattern finds you every season, allergists in Port Jefferson, NY 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.
Port Jefferson in its local area
Across New York’s 1289 tracked cities, Port Jefferson ranks joint 821st today.
Like every Pollen Atlas city page, the Port Jefferson, NY pollen count is refreshed each morning.
Nearby cities
- Port Jefferson Station pollen count (1 miles away)
- Belle Terre pollen count (1 miles away)
- Mount Sinai pollen count (2 miles away)
- Poquott pollen count (2 miles away)
- Terryville pollen count (2 miles away)
- East Setauket pollen count (3 miles away)
From Pollen Atlas News
See how Port Jefferson ranks in today's pollen count rankings — the worst cities for allergies today
See Port Jefferson 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).