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
October is the quietest part of the year in San Francisco. None of the species reported here are typically in season this month.
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.
Frequently asked questions
Which pollen is in the air in San Francisco right now?
October is the quietest month of the year in San Francisco. None of the species reported there are typically in season.
When is pollen season in 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.
Which pollen species are reported in San Francisco?
11 of the eleven species Respira reports in the United States occur around San Francisco: Ragweed, Grass, Oak, Birch, Maple, Juniper / Cedar, Elm, Ash, Cottonwood, Pine, Alder. San Francisco sits in the Pacific Coast, which is what decides which species occur and when.
Where does the pollen data for San Francisco come from?
The month-by-month calendar on this page is a seasonal estimate for the Pacific Coast. For measured daily levels, the Respira app uses the Google Pollen API across the United States, and reports no reading rather than a zero when a species has no data.
Nearby cities
Respira is an informational tool. It does not replace diagnosis or advice from a medical professional.