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 San Jose 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 10:26 am PT.
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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 San Jose 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 San Jose 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 8.3% of adults in the city of San Jose have current asthma, according to the CDC’s PLACES estimate for 2023 (95% confidence interval: 7.3% to 9.3%). It is a statistical estimate from national survey data, not a count.
45 allergists enrolled in Medicare practice in the San Jose area: 2.27 for every 100,000 people, more 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 San Jose 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.
The Santa Cruz Mountains rise west and south of San Jose, which lies in their rain shadow, while the Diablo Range lines the east side of the Santa Clara Valley.2 About 14 inches of rain and other precipitation falls in a typical year, and the freeze-free season runs about 347 days.1 The wet season runs from November through March, and a northwest sea breeze typically develops in the afternoon.2
The city’s Community Forest Management Plan counts about 243,000 street trees.3 Three species, Chinese pistache, crape myrtle and London plane, are close to or above a guideline that no more than 10 percent of the tree population be one species.3
Valley oak, a tree found only in California, ranges through the foothills and valleys of the Coast Ranges.4 It is wind pollinated, and its catkins emerge in March and April.4 Bermuda grass grows throughout California outside the Great Basin, below about 2,900 feet, and blooms from June through September.5
Answered from the values on this page.
Very little. None of the plants Google models is above 0 in San Jose today.
No. It’s Google’s modeled pollen index, from 0 (none) to 5 (very high), calculated for the location of central San Jose. 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 San Jose, so each day starts with its own values, and again after Google’s daily model run, usually by about 7:30 am PT. Each section shows when its values were retrieved.
Source: Includes pollen data from GoogleIncludes data from Google Maps