Somerville, MA Pollen Count
Somerville, MA · Last updated Friday, November 6, 2026
This page shows the most recent reading available for Somerville — 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).
Somerville, MA
Weeds Index
How active weeds pollen is today (0–100).
Somerville, MA
Pollen Types
Pick a pollen subtype to update the species forecast
5-Day Somerville Overall Pollen Forecast
Bars are colored by severity (Low/Moderate/High).
This reading is the forecast point shared with Cambridge, MA — 2 nearby places use the same point; Somerville is 0.3 km from it.
Pollen count Somerville residents check each morning
The Somerville pollen count today is 12 (Low). The main driver is Ragweed, with weed pollen at 16 today. Weed pollen leads the split at 16 (Low on its own scale), followed by tree pollen at 0.6 and grass pollen at 0.6. Below, the plant detail and the multi-day outlook show whether today is the pattern or the exception. 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 Somerville 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 Somerville pollen forecast below — it is currently mixed, with Monday the highest day in the window.
This is the pollen count Somerville residents check each morning, built from the day’s tree, grass, weed and mold readings.
What is the Somerville pollen count today?
The Somerville pollen count today is 12 out of 100 (Low) on the Pollen Atlas Total Pollen Index, driven mainly by Ragweed.
Short answer for anyone searching pollen count today Somerville: this page is updated every morning with the day’s modelled reading.
Somerville allergies today
Somerville allergies today are set by the same reading as the pollen count above: the Total Pollen Index is 12 (Low), driven mainly by Ragweed. When people ask about Somerville allergies, this is the number that answers them — one daily index built from today’s tree, grass, weed and mold readings for Somerville.
Allergies in Somerville follow the Massachusetts 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 Somerville 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 Somerville allergy forecast: today reads 12 (Low), and the day-by-day outlook shows whether Somerville 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 Somerville today records is this same combined reading — tree, grass, weed and mold in one index.
The Somerville allergy count today is 12 (Low) — the same Total Pollen Index as the pollen count above, in one combined reading.
Pollen count today Somerville: the 5-day forecast
| Day | Total Pollen Index | Band |
|---|---|---|
| Friday, November 6 | 12 | Low |
| Saturday, November 7 | 18 | Low |
| Sunday, November 8 | 13 | Low |
| Monday, November 9 | 28 | Low |
| Tuesday, November 10 | 28 | Low |
Pollen Atlas forecasts Somerville’s pollen count to peak on Monday at 28 (Low) over the next 5 days.
Pollen by type in Somerville
What is driving Somerville’s pollen today
The shape of today’s 12 (Low) is set by weed pollen at 16 (Low on its own scale) — about 93% of the four category readings added together, 15.4 points clear of the next category, tree pollen at 0.6. 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 Massachusetts 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 Somerville, so the drivers have to be read from the category split above. The Massachusetts guide’s account of Massachusetts names birch, opening the spring in April, and oak carrying the peak through May — 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 12 to 28, never changing band. Today’s 12 sits 8 points below the window’s average of 19.8 — a moving window, worth reading day by day rather than from the average.
Plants affecting Somerville now
Detailed plant-by-plant readings for Somerville 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 0.6 (Low).
Weed pollen is one of the categories with a non-zero reading today, at 16 (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.
Somerville pollen through the year
Three chapters make the Massachusetts pollen year, and Somerville follows them in the Northeast order. The tree chapter: trees open in late March and build to an oak-led peak in May. The grass chapter: grasses hold from late May into July. The weed chapter: 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.
Massachusetts runs three overlapping springs — coast, Connecticut River valley and Berkshire high ground — which can trail one another by weeks. Grass holds the middle of the year, from late May into July, with the western counties’ hay country adding an agricultural source the suburbs never see. The Massachusetts guide singles out birch, opening the spring in April, and oak carrying the peak through May.
November falls between the main chapters of the Massachusetts 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 Massachusetts year, March to October — a compressed season, which is why its chapters arrive in quick succession. The full calendar is set out in the Massachusetts allergy season guide.
How to read this index
Pollen Atlas reports the Somerville 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 Somerville, MA 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.
Somerville in today’s national picture
At 12 (Low), Somerville ranks joint 74231st 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 Somerville: Cambridge, MA (1 miles away) reads 12 (Low); Medford, MA (2 miles away) reads 12 (Low); Everett, MA (3 miles away) reads 12 (Low). Somerville reads exactly level with its nearest tracked neighbour today. Across Massachusetts’s 244 tracked cities, today runs from 5 in Pittsfield to 15 in Nantucket.
Pollen totals are population numbers; symptoms are personal. The same reading can leave one Somerville resident untouched and floor another, depending on which pollens they are sensitised to. If this pattern finds you every season, allergists in Somerville, MA 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.
Somerville in its local area
Somerville is a city in Middlesex County, Massachusetts. Its population is 80,549 (ACS 2023).
Somerville sits 1 miles northeast of Cambridge, MA — the anchor of the forecast-point group this reading belongs to. Within the group of 2, Somerville ranks joint 1st; across Massachusetts’s 244 tracked cities, it ranks joint 3rd today.
Like every Pollen Atlas city page, the Somerville, MA pollen count is refreshed each morning.
Nearby cities
- Cambridge pollen count (1 miles away)
- Medford pollen count (2 miles away)
- Everett pollen count (3 miles away)
- Boston pollen count (3 miles away)
- Malden pollen count (3 miles away)
- Chelsea pollen count (4 miles away)
From Pollen Atlas News
See how Somerville ranks in today's pollen count rankings — the worst cities for allergies today
See Somerville 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).