CA · Allergy Season Guide
San Francisco Allergy Season Guide
PollyMap is actively seeking a qualified local collection partner in San Francisco. This guide uses regional climate and historical allergen data while we recruit a local host.
PollyMap is actively looking for a qualified local partner in San Francisco.
We're recruiting a qualified local allergy clinic — or any clinic that provides allergy care — to become the official pollen collection partner for San Francisco.
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Test the air at your own home in San Francisco
No allergy clinic is reporting from San Francisco yet. Until one does, you can order your own PollyKit — a simple air sampler you hang outdoors or indoors. Send it back and the PollyKit Lab shows you exactly what's floating in your air.
- Pollen from local trees, grasses and weeds
- Airborne mold spores
- Dust mites and other indoor allergens
Hang it outdoors
See which pollen and mold are in your yard this season.
Or hang it indoors
Check bedrooms and living spaces for mold, dust mites and more.
Summary
PollyMap does not yet have weekly collected pollen data for San Francisco. This guide is based on regional climate patterns and historical allergen data while we recruit a local collection partner. Tree pollen peaks in spring, grass pollen in late spring and early summer, and weed pollen in late summer and fall.
Local allergy guide for San Francisco
San Francisco shares California's a Mediterranean climate with mild, wet winters and warm, dry summers along the coast, with hotter inland valleys. at 52 ft elevation.
San Francisco at 52 ft elevation sits within California's broader regional climate.
In San Francisco, tree pollen — including Oak, Olive, Cypress — typically dominates from late winter through spring. Bermuda grass is the most common warm-season pollinator, and Ragweed drives the largest fall pollen load.
San Francisco's local mold profile includes Cladosporium, Alternaria, Penicillium. Spore counts tend to peak after rainfall and during the warm, humid portion of the year.
Local weather — temperature, rainfall, wind, and humidity — drives day-to-day pollen levels. Dry, windy days following warm weather typically produce the highest counts, while heavy rain temporarily clears the air.
San Francisco monthly allergy calendar
Typical month-by-month intensity for the four major airborne allergen categories in San Francisco.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Tree | Mod | High | V.High | V.High | High | Mod | Low | Low | Mod | Mod | Low | Low |
| Grass | Low | Low | Mod | High | V.High | High | Mod | Mod | Mod | Low | Low | Low |
| Weed | Low | Low | Mod | Mod | Mod | High | High | V.High | V.High | High | Mod | Low |
| Mold | Mod | Mod | Mod | Mod | Low | Low | Low | Low | Mod | High | High | Mod |
Most common airborne molds
Frequently asked questions about allergies in San Francisco
Related guides
State Guide
California Allergy Season Guide
Nearby city
Los Angeles Allergy Season Guide
Nearby city
San Diego Allergy Season Guide
Nearby city
San Jose Allergy Season Guide
Nearby city
Fresno Allergy Season Guide
Nearby city
Sacramento Allergy Season Guide
Library
Pollen species library
Library
Mold species library
Reports
Latest PollyMap reports
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