What is the pollen count in San Francisco today?

Today's pollen levels in San Francisco: Tree pollen is None, Grass pollen is Low, Weed pollen is Low. Grass pollen is the dominant type right now, driven by Grass.

What will the pollen count be tomorrow in San Francisco?

Pollen in San Francisco is forecast to reach Low tomorrow. Weed pollen is the main driver. That's a full-day figure, so early morning usually runs higher than late afternoon. Check again in the morning, because wind and rain can shift it overnight.

What does a Low pollen count mean in San Francisco?

A Low pollen count means concentrations are minimal. Most people, including those with mild allergies, can spend time outdoors comfortably.

What are the main allergy triggers in San Francisco right now?

Pollen levels across all types are currently low in San Francisco. Most allergy sufferers should find conditions manageable today.

What should allergy sufferers do when pollen is Low in San Francisco?

Pollen levels are low in San Francisco today, so most outdoor activities should be comfortable. It is still a good idea to check levels daily, since conditions can change quickly with wind and weather shifts.

Does weather affect pollen levels in San Francisco?

Yes, weather directly affects pollen levels in San Francisco. Wind spreads pollen farther, rain washes it from the air, and humidity can either trap or disperse particles.

San Francisco, CA Pollen Count Today

Name: Pollen Data for San Francisco
Creator: MyPollenPal
Keywords: pollen, air quality, allergies, forecast

Live pollen forecast and air quality for San Francisco, California

📍 San Francisco, CAToday · Nov 12

6/10

Breathability™ Score

Good day overall with a few allergy-aware adjustments.

🌳Tree Pollen

None

🌱Grass Pollen

Low

🌿Weed Pollen

Low

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Today's Pollen Levels in San Francisco

Grass pollen is slightly elevated at Low levels in San Francisco. Overall conditions are manageable for most people. With a Breathability™ Score of 6, conditions are mixed and may vary through the day.

Breathability™ Score is 6/10
Tree pollen is None, led by Alder and Birch
Grass pollen is Low, led by Grass
Weed pollen is Low, led by Ragweed and Mugwort
Air quality is Moderate today

Yesterday's Pollen in San Francisco

→Tree pollen: None yesterday, None today

→Grass pollen: Low yesterday, Low today

→Weed pollen: Low yesterday, Low today

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 holds at Low every day through Sunday.

Today

Nov 11

Overall: Low

Tree: None

Grass: Low

Weed: Low

Wind: 4 mph

Rain: 10%

Humidity: 77%

Thu

Nov 12

Overall: Low

Tree: None

Grass: Low

Weed: Low

Wind: 11 mph

Rain: 17%

Humidity: 75%

Fri

Nov 13

Overall: Low

Tree: None

Grass: Low

Weed: Low

Wind: 18 mph (may spread pollen)

Rain: 85% (may wash pollen out)

Humidity: 83%

Sat

Nov 14

Overall: Low

Tree: None

Grass: Low

Weed: Low

Wind: 6 mph

Rain: 36%

Humidity: 78%

Sun

Nov 15

Overall: Low

Tree: None

Grass: Low

Weed: Low

Wind: 9 mph

Rain: 88% (may wash pollen out)

Humidity: 81%

Rain is likely Friday (85% chance). The hour or two right after it stops is usually the cleanest air of the day. Plan around Saturday though. Pollen often climbs the day after rain, when plants use the moisture to release a fresh burst.

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/m³

Birch0 grains/m³

Hazel0 grains/m³

Oak0 grains/m³

Grass Pollen in San Francisco Today

Grass pollen in San Francisco is Low today, reaching 0.10 grains/m³. 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

Grass0.10 grains/m³

Weed Pollen in San Francisco Today

Weed pollen in San Francisco is Low today, reaching 0.33 grains/m³. 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

Ragweed0.33 grains/m³

Mugwort0 grains/m³

Air Quality in San Francisco Today

🌬️

Air Quality

Moderate

Air Pollutant Breakdown

PM2.5Moderate

23 µg/m³

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

25 µg/m³

Larger particles up to 10 micrometers, like dust or pollen. They can irritate your airways and worsen allergies or asthma.

Ozone (O3)Good

28 µg/m³

Elevated levels irritate airways and can worsen asthma symptoms.

Nitrogen Dioxide (NO2)Good

50.2 µg/m³

A respiratory irritant from vehicle exhaust that can trigger inflammation in sensitive airways.

Sulfur Dioxide (SO2)Good

3.2 µg/m³

Even brief exposure can tighten airways, especially for people with asthma.

Carbon Monoxide (CO)Good

307 µg/m³

High levels reduce oxygen delivery in the body, compounding breathing difficulty on high-pollen days.

See the full San Francisco air quality report →

Weather in San Francisco Today

☀️

Weather

65°F

Clear

Humidity

65%

Wind

2 mph S

Feels Like

66°F

Pressure

1015 mb

Frequently Asked Questions

When pollen keeps winning, see an allergist

Pollen shifts week to week in San Francisco. 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 →

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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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