What is the pollen count in San Jose today?

Today's pollen levels in San Jose: 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 Jose?

Pollen in San Jose 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 Jose?

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 Jose right now?

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

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

Pollen levels are low in San Jose 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 Jose?

Yes, weather directly affects pollen levels in San Jose. Wind spreads pollen farther, rain washes it from the air, and humidity can either trap or disperse particles. Higher humidity today (72%) may help keep some pollen grounded.

San Jose, CA Pollen Count Today

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

Live pollen forecast and air quality for San Jose, California

📍 San Jose, CAToday · Nov 12

8/10

Breathability™ Score

Excellent breathing conditions for most plans today.

🌳Tree Pollen

None

🌱Grass Pollen

Low

🌿Weed Pollen

Low

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Today's Pollen Levels in San Jose

Grass pollen is slightly elevated at Low levels in San Jose. Overall conditions are manageable for most people. With a Breathability™ Score of 8, breathing conditions look good for most people.

Breathability™ Score is 8/10
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 Good today

How Today's Pollen May Affect You

Mild allergy sufferers

Most plans can stay the same today. Weed pollen is elevated and air quality is Good, so a quick rinse after time outside may help.

Moderate allergy sufferers

Conditions look manageable with routine precautions. Keep windows closed during peak pollen periods and shower after outdoor time.

Severe allergy sufferers

Even on a better day, keep your usual high-protection routine and avoid long exposure when pollen spikes.

5-Day Pollen Forecast

Pollen in San Jose holds at Low every day through Monday.

Today

Nov 12

Overall: Low

Tree: None

Grass: Low

Weed: Low

Wind: 9 mph

Rain: 7%

Humidity: 64%

Fri

Nov 13

Overall: Low

Tree: None

Grass: Low

Weed: Low

Wind: 12 mph

Rain: 85% (may wash pollen out)

Humidity: 83%

Sat

Nov 14

Overall: Low

Tree: None

Grass: Low

Weed: Low

Wind: 4 mph

Rain: 23%

Humidity: 74%

Sun

Nov 15

Overall: Low

Tree: None

Grass: Low

Weed: Low

Wind: 8 mph

Rain: 81% (may wash pollen out)

Humidity: 73%

Mon

Nov 16

Overall: Low

Tree: None

Grass: Low

Weed: Low

Wind: 7 mph

Rain: 65% (may wash pollen out)

Humidity: 73%

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 Jose Today

Tree pollen in San Jose 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 Jose Today

Grass pollen in San Jose is Low today, reaching 0.18 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

Grass0.18 grains/m³

Weed Pollen in San Jose Today

Weed pollen in San Jose is Low today, reaching 0.66 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

Ragweed0.66 grains/m³

Mugwort0 grains/m³

Air Quality in San Jose Today

🌬️

Air Quality

Good

Air Pollutant Breakdown

PM2.5Moderate

14 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

18 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

65 µg/m³

Elevated levels irritate airways and can worsen asthma symptoms.

Nitrogen Dioxide (NO2)Good

13.4 µg/m³

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

Sulfur Dioxide (SO2)Good

1.1 µg/m³

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

Carbon Monoxide (CO)Good

235 µg/m³

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

See the full San Jose air quality report →

Weather in San Jose Today

🌤️

Weather

62°F

Sunny

Humidity

72%

Wind

2 mph SSE

Feels Like

62°F

Pressure

1012 mb

Frequently Asked Questions

When pollen keeps winning, see an allergist

Pollen shifts week to week in San Jose. 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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