Pollen today
Loading today’s values…
Pollen today
Loading today’s values…
Google gave no index for tree, grass or weed pollen here today.
Next four days, highest level each day:
Source: Includes pollen data from GoogleGoogle Maps
Source: Includes pollen data from GoogleIncludes data from Google Maps
Google’s index for each plant it models in Portland today. A plant out of season has no index.
Source: Includes pollen data from GoogleGoogle Maps
The forecast that moves pollen around, and the air beside it.
Forecast: National Weather Service, updated 2:15 pm ET.
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Each thread is one kind of pollen, and each square is one week, colored by that week’s highest level.
Google has given no index for Portland since records began on October 14, 2026.
Highest level each week, November 2025 to November 2026, from each day’s forecast.
Source: Includes pollen data from GoogleIncludes data from Google Maps
What this forecast doesn’t measure, and when to get help.
Google’s index covers tree, grass and weed pollen only, so there is no mold level for Portland on this page. The National Allergy Bureau publishes pollen and mold counts measured at its stations. Our guides cover common molds such as Alternaria, Cladosporium and Aspergillus.
The forecast doesn’t cover allergens indoors either: dust mites, cockroaches, mice, cats and dogs. Our guides explain each one, starting with dust mites and cats.
An estimated 12.2% of adults in the city of Portland have current asthma, according to the CDC’s PLACES estimate for 2023 (95% confidence interval: 11.0% to 13.5%). It is a statistical estimate from national survey data, not a count.
5 allergists enrolled in Medicare practice in the Portland area: 0.87 for every 100,000 people, fewer than the 1.22 across the US. The count doesn’t show how soon you can get an appointment. See the doctors listed in the Portland area, or how every state and metro compares.
AllergyNest count from CMS’s Doctors and Clinicians file (October 2026) and Census population estimates for 2025.
The geography, climate and plants behind each season here, with a source for every fact.
Snow totals about 69 inches in an average year at the Portland International Jetport.1 A typical year there brings 170 days between the last spring freeze and the first fall freeze.1
Eastern white pine grows throughout eastern North America, where the climate is cool and humid.2 The University of Maine’s New England phenology program says the tree produces its cones in spring, typically between May and June, and that its male cones open to release pollen.2
Maine’s Board of Pesticides Control describes common ragweed as a native annual found in fields, gardens, along roadsides and in vacant lots.3 It flowers from July to November.3 The male flowers produce a fine yellow pollen, and each plant may produce up to 1 billion pollen grains.3
Answered from the values on this page.
Very little. None of the plants Google models is above 0 in Portland today.
No. It’s Google’s modeled pollen index, from 0 (none) to 5 (very high), calculated for the location of central Portland. A pollen count is the number of pollen grains measured in a cubic meter of air at a counting station. How our pollen index works.
Twice a day. We fetch new values soon after midnight in Portland, so each day starts with its own values, and again after Google’s daily model run, usually by about 10:30 am ET. Each section shows when its values were retrieved.
Source: Includes pollen data from GoogleIncludes data from Google Maps