Respira
Pollen in San Francisco, California
The fog belt holds counts down in the city itself while the East Bay and the inland valleys run considerably higher on the same day.
San Francisco sits in the Pacific Coast, which is what decides the shape of its pollen year. 11 of the eleven species Respira reports in the United States occur here.
In season in San Francisco right now
As of August, these are the species expected to be in the air in San Francisco:
This is the seasonal expectation for the Pacific Coast, not a measurement. The app reports the level measured for your own location each day, and says so when there is no reading rather than showing a zero.
Pollen calendar for San Francisco
Month by month intensity for every species that occurs in the Pacific Coast. Darker means higher. The current month is marked.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Ragweed | Jan: none | Feb: none | Mar: none | Apr: none | May: none | Jun: none | Jul: none | Aug: low | Sep: low | Oct: none | Nov: none | Dec: none |
| Grass | Jan: none | Feb: none | Mar: low | Apr: moderate | May: high | Jun: high | Jul: moderate | Aug: low | Sep: none | Oct: none | Nov: none | Dec: none |
| Oak | Jan: none | Feb: none | Mar: low | Apr: moderate | May: moderate | Jun: low | Jul: none | Aug: none | Sep: none | Oct: none | Nov: none | Dec: none |
| Birch | Jan: none | Feb: none | Mar: moderate | Apr: high | May: moderate | Jun: none | Jul: none | Aug: none | Sep: none | Oct: none | Nov: none | Dec: none |
| Maple | Jan: none | Feb: low | Mar: moderate | Apr: moderate | May: low | Jun: none | Jul: none | Aug: none | Sep: none | Oct: none | Nov: none | Dec: none |
| Juniper / Cedar | Jan: none | Feb: low | Mar: moderate | Apr: moderate | May: low | Jun: none | Jul: none | Aug: none | Sep: none | Oct: none | Nov: none | Dec: none |
| Elm | Jan: none | Feb: low | Mar: moderate | Apr: low | May: none | Jun: none | Jul: none | Aug: none | Sep: low | Oct: none | Nov: none | Dec: none |
| Ash | Jan: none | Feb: low | Mar: moderate | Apr: moderate | May: low | Jun: none | Jul: none | Aug: none | Sep: none | Oct: none | Nov: none | Dec: none |
| Cottonwood | Jan: none | Feb: low | Mar: moderate | Apr: high | May: moderate | Jun: none | Jul: none | Aug: none | Sep: none | Oct: none | Nov: none | Dec: none |
| Pine | Jan: none | Feb: none | Mar: low | Apr: moderate | May: high | Jun: moderate | Jul: none | Aug: none | Sep: none | Oct: none | Nov: none | Dec: none |
| Alder | Jan: high | Feb: very high | Mar: high | Apr: moderate | May: none | Jun: none | Jul: none | Aug: none | Sep: none | Oct: none | Nov: none | Dec: none |
Seasonal estimate by climate zone, not a measurement. Seasons shift with elevation and with the year's weather.
What grows around San Francisco
- Ragweed
- Peaks in August and September.
- Grass
- Peaks in May and June.
- Oak
- Peaks in April and May.
- Birch
- Peaks in April.
- Maple
- Peaks in March and April.
- Juniper / Cedar
- Peaks in March and April.
- Elm
- Peaks in March.
- Ash
- Peaks in March and April.
- Cottonwood
- Peaks in April.
- Pine
- Peaks in May.
- Alder
- Peaks in February.
Track today's levels in San Francisco
This page is the shape of the year. For today's actual numbers, Respira reports the eleven US species for wherever you are, air quality on the EPA scale, and a symptom diary you can export as a PDF for your allergist.
Nearby cities
Respira is an informational tool. It does not replace diagnosis or advice from a medical professional.