San Francisco, CA Pollen Count Today

Live pollen forecast and air quality for San Francisco, California

šŸ“ San Francisco, CAToday Ā· Sep 20
4/10
Breathabilityā„¢ Score
Mixed conditions - sensitive groups may want extra precautions.
šŸŒ³Tree Pollen
None
šŸŒ±Grass Pollen
Moderate
šŸŒæWeed Pollen
Very High
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Today's Pollen Levels in San Francisco

Weed pollen and Grass pollen are both elevated today in San Francisco, which is driving the Breathabilityā„¢ Score down. People sensitive to multiple pollen types may notice stronger symptoms. With a Breathabilityā„¢ Score of 4, conditions are mixed and may vary through the day.

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How Today's Pollen May Affect You

Mild allergy sufferers
You may notice mild irritation at peak times. Weed pollen is elevated; consider shorter midday exposure and keep water handy.
Moderate allergy sufferers
Plan around peak pollen windows. Try errands early or later, and consider a mask in high-traffic outdoor areas.
Severe allergy sufferers
Use high-protection habits today: shorter trips, cleaner indoor air, and reduced exposure during peak pollen hours.

5-Day Pollen Forecast

Pollen in San Francisco drops to Moderate tomorrow and holds there through Wednesday.

Today
Sep 19
Overall: High
Tree: None
Grass: Low
Weed: High
Wind: 15 mph (may spread pollen)
Rain: 25%
Humidity: 83%
Sun
Sep 20
Overall: Moderate
Tree: None
Grass: Low
Weed: Moderate
Wind: 12 mph
Rain: 34%
Humidity: 85%
Mon
Sep 21
Overall: Moderate
Tree: None
Grass: Low
Weed: Moderate
Wind: 15 mph (may spread pollen)
Rain: 31%
Humidity: 82%
Tue
Sep 22
Overall: Moderate
Tree: None
Grass: Low
Weed: Moderate
Wind: 15 mph (may spread pollen)
Rain: 24%
Humidity: 82%
Wed
Sep 23
Overall: Moderate
Tree: None
Grass: Low
Weed: Moderate
Wind: 10 mph
Rain: 17%
Humidity: 78%

Tree Pollen in San Francisco Today

Tree pollen in San Francisco is None today. Tree pollen season typically runs from early spring through late May, peaking when deciduous trees release their pollen. On low days like today, outdoor activities are generally comfortable for most allergy sufferers.

Species Breakdown

Alder0 grains/mĀ³
Birch0 grains/mĀ³
Hazel0 grains/mĀ³
Oak0 grains/mĀ³

Grass Pollen in San Francisco Today

Grass pollen in San Francisco is Moderate today, reaching 20.35 grains/mĀ³. Grass is currently elevated. People with grass pollen sensitivity may notice nasal congestion and itchy eyes, especially during outdoor activities.

Common Symptoms

  • Itchy nose and eyes
  • Sneezing fits
  • Nasal congestion
  • Watery eyes
  • Coughing or wheezing for sensitive people

Species Breakdown

Grass20.35 grains/mĀ³

Weed Pollen in San Francisco Today

Weed pollen in San Francisco is Very High today, reaching 198.28 grains/mĀ³. Ragweed and Mugwort are the primary driver. Ragweed is the most common allergen in this category, and elevated levels can trigger persistent symptoms even in people who are only mildly sensitive.

Common Symptoms

  • Persistent sneezing
  • Runny nose
  • Itchy eyes and throat
  • Nasal congestion
  • Fatigue from prolonged exposure

Species Breakdown

Ragweed198.28 grains/mĀ³
Mugwort17.14 grains/mĀ³

Air Quality in San Francisco Today

šŸŒ¬ļø
Air Quality
Good
Good

Air Pollutant Breakdown

PM2.5Good
11 Āµg/mĀ³
Tiny particles smaller than 2.5 micrometers that can reach deep into your lungs and bloodstream. High levels can affect breathing and heart health.
PM10Good
16 Āµg/mĀ³
Larger particles up to 10 micrometers, like dust or pollen. They can irritate your airways and worsen allergies or asthma.
Ozone (O3)Good
64 Āµg/mĀ³
Elevated levels irritate airways and can worsen asthma symptoms.
Nitrogen Dioxide (NO2)Good
7.4 Āµg/mĀ³
A respiratory irritant from vehicle exhaust that can trigger inflammation in sensitive airways.
Sulfur Dioxide (SO2)Good
0.7 Āµg/mĀ³
Even brief exposure can tighten airways, especially for people with asthma.
Carbon Monoxide (CO)Good
126 Āµg/mĀ³
High levels reduce oxygen delivery in the body, compounding breathing difficulty on high-pollen days.
See the full San Francisco air quality report ā†’

Weather in San Francisco Today

ā˜ļø
Weather
59Ā°F
Partly Cloudy
Humidity
85%
Wind
15 mph W
Feels Like
52Ā°F
Pressure
1014 mb

Frequently Asked Questions

When pollen keeps winning, see an allergist

Weed pollen is running Very High in San Francisco today. If cetirizine (Zyrtec) or a steroid nasal spray stopped holding your symptoms down, or they drag on for months at a time, a board-certified allergist can test exactly what you react to and treat the cause instead of the symptom.

See 5 board-certified allergists in California ā†’

Get free daily pollen alerts

Morning alerts for San Francisco when pollen is high. One email a day, only when it matters.

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Allergy Guides and Resources

Seasonal pollen guides, daily city rankings, and practical tips for managing your allergies.

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