Dr. Iris Otani
Allergy & Immunology Mission Bay
San Francisco, CA · California
San Francisco, CA Pollen Count Today
View today's allergy index, primary allergen, weather context, tree, grass, and weed pollen levels, plus the 5-day pollen forecast for San Francisco.
Today's pollen count in San Francisco
Today in San Francisco, California, the forecasted pollen level is very low with an allergy index of 1. The primary allergen is Ragweed. Use the forecast below to see whether conditions are likely to rise, ease, or stay steady over the next few days.
AllergyAva shows forecasted pollen levels and allergy risk estimates for San Francisco. Actual exposure can vary by neighborhood, weather, and time outdoors.
Pollen Level
Very Low Risk1
Google UPI (0–5)
Primary Allergen
Ragweed
Pollen exposure is very low. Most people can spend time outdoors with minimal allergy concerns.
84°
Temp
76%
Humidity
10
Wind mph
Pollen: Includes data from Google Maps · Weather: AllergyAva estimated fallback
5-Day Pollen Forecast
Best day this week
Today - Very Low
Worst day this week
Sat - Very Low
Today
78°/57°
1
Very Low
Tree0
Grass0
Weed1
Tomorrow
78°/57°
1
Very Low
Tree0
Grass0
Weed1
Thu
78°/57°
1
Very Low
Tree0
Grass0
Weed1
Fri
78°/57°
1
Very Low
Tree0
Grass0
Weed1
Sat
78°/57°
1
Very Low
Tree0
Grass0
Weed1
None
Very Low
Low
Moderate
High
Very High
Allergen Breakdown
Ragweed
Very Low
Ava Personal Risk
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Weather-allergy synergy
Why conditions feel this way today
Outdoor pollen exposure looks limited in San Francisco today, though sensitive users should still watch wind, humidity, and time spent near active vegetation.
- Temp
- 84°F
- Humidity
- 76%
- Wind
- 10 mph
- Rain chance
- 54%
24-hour allergy risk curve
Best outdoor window today in San Francisco
Better
Short outdoor plans are more reasonable today, especially away from active vegetation.
Avoid
Extended exposure near mowing, leaf litter, or heavy tree cover if those trigger symptoms.
Extra caution
Check tomorrow's trend before planning longer outdoor time.
Data Confidence & Sources
Pollen Forecast
- Source
- Includes data from Google Maps · Pollen API (1×1 km grid resolution)
- Last Daily Update
Pollen models recalculate once daily
Weather Conditions
- Source
- AllergyAva estimated weather fallback
- Last Refresh
Weather data updates every 15–30 minutes
Local pollen exposure can vary by micro-vegetation, wind gusts, structural barriers, and time spent outdoors.
Check pollen in another city or ZIP code
Local allergy care
Allergists near San Francisco, CA
Use today's pollen forecast alongside nearby allergy and immunology profiles when symptoms need clinical follow-up, testing, or long-term treatment planning.
Dr. Jaspreet Dhami
Latitude Food Allergy Care
Dr. Michele Pham
Allergy & Immunology Parnassus
Showing 3 of 5 published allergist profiles in this area.
City allergy guide
San Francisco allergy profile
Today's risk+
San Francisco allergy conditions are shaped by local weather, seasonal vegetation, and short-term changes in wind, rain, humidity, and temperature. Tree pollen is usually more important in spring, grass pollen often builds from late spring into summer, and weed pollen can become more noticeable later in the year.
Use today's pollen index alongside the 5-day forecast to plan commutes, outdoor exercise, yard work, and window-open time in San Francisco. Conditions can still vary by neighborhood, nearby plants, and time spent outdoors.
San Francisco's guide sections below focus on recurring local exposure patterns. Today's very low Ragweed reading is the live risk signal, while the seasonal and neighborhood notes explain where exposure can still differ during normal routines.
Seasonal guide+
Spring
Tree pollen
Often drives early-season symptoms
Late spring to summer
Grass pollen
Can rise around lawns, parks, and open areas
Late summer to fall
Ragweed/weed pollen
Major fall allergy trigger
Varies
Mold spores
Often affected by moisture and decaying leaves
Treatment and planning tips+
Track the forecast
Check San Francisco pollen levels daily during active allergy periods.
Reduce indoor exposure
Keep windows closed on high-pollen days and use HVAC or HEPA filtration when appropriate.
Plan medication timing
Follow your clinician's or product-label instructions, especially before your usual peak season.
San Francisco seasonal pollen calendar
Tree pollen
Spring
Often drives early-season symptoms
Grass pollen
In season nowLate spring to summer
Can rise around lawns, parks, and open areas
Ragweed/weed pollen
In season nowLate summer to fall
Major fall allergy trigger
Mold spores
Varies
Often affected by moisture and decaying leaves
Common pollen triggers around San Francisco
| Trigger | Typical season | What to know |
|---|---|---|
| Tree pollen | Spring | Often drives early-season symptoms |
| Grass pollen | Late spring to summer | Can rise around lawns, parks, and open areas |
| Ragweed/weed pollen | Late summer to fall | Major fall allergy trigger |
| Mold spores | Varies | Often affected by moisture and decaying leaves |
San Francisco pollen forecast with coastal Bay Area variation
San Francisco allergy conditions can look different from inland California because of marine air, cooler temperatures, and neighborhood-level microclimates. People searching for a San Francisco pollen forecast often want to understand how coastal weather affects daily exposure.
Although the city is known for fog and cooler conditions, San Francisco residents may still encounter tree, grass, and weed pollen during different parts of the year. Local pollen monitoring helps account for shifting winds and Bay Area seasonal changes.
Frequently asked questions about pollen in San Francisco
What is the pollen count in San Francisco today?
Today in San Francisco, California, the pollen level is very low with an allergy index of 1. The main allergen to watch is Ragweed.
When is allergy season in San Francisco, California?
Allergy season in San Francisco, California can vary by allergen and weather conditions. Tree pollen often rises in spring, grass pollen becomes more active in late spring and summer, and weed pollen can remain elevated later in the year depending on local climate and vegetation.
How often should I check the pollen forecast in San Francisco?
If you have seasonal allergies in San Francisco, it is helpful to check the pollen forecast daily during peak allergy periods. Shifts in wind, rainfall, temperature, and humidity can all change local pollen exposure from one day to the next.
What pollen types affect people in San Francisco, California?
San Francisco residents may be affected by tree pollen, grass pollen, and weed pollen during different parts of the year. The strongest trigger depends on the season, nearby vegetation, and current weather conditions.