San Jose, CA Pollen Count Today

Live pollen forecast and air quality for San Jose, California

šŸ“ San Jose, CAToday Ā· Sep 21
6/10
Breathabilityā„¢ Score
Good day overall with a few allergy-aware adjustments.
šŸŒ³Tree Pollen
None
šŸŒ±Grass Pollen
Low
šŸŒæWeed Pollen
Moderate
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Today's Pollen Levels in San Jose

Weed pollen is slightly elevated at Moderate levels in San Jose. Overall conditions are manageable for most people. With a Breathabilityā„¢ Score of 6, conditions are mixed and may vary through the day.

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 Jose holds at Moderate every day through Friday.

Today
Sep 21
Overall: Moderate
Tree: None
Grass: Low
Weed: Moderate
Wind: 5 mph
Rain: 4%
Humidity: 64%
Tue
Sep 22
Overall: Moderate
Tree: None
Grass: Low
Weed: Moderate
Wind: 7 mph
Rain: 4%
Humidity: 63%
Wed
Sep 23
Overall: Moderate
Tree: None
Grass: Low
Weed: Moderate
Wind: 5 mph
Rain: 4%
Humidity: 51%
Thu
Sep 24
Overall: Moderate
Tree: None
Grass: Low
Weed: Moderate
Wind: 9 mph
Rain: 8%
Humidity: 46%
Fri
Sep 25
Overall: Moderate
Tree: None
Grass: Low
Weed: Moderate
Wind: 9 mph
Rain: 5%
Humidity: 65%

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

Grass Pollen in San Jose Today

Grass pollen in San Jose is Low today, reaching 3.87 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

Grass3.87 grains/mĀ³

Weed Pollen in San Jose Today

Weed pollen in San Jose is Moderate today, reaching 43.43 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

Ragweed43.43 grains/mĀ³
Mugwort1.93 grains/mĀ³

Air Quality in San Jose Today

šŸŒ¬ļø
Air Quality
Good
Good

Air Pollutant Breakdown

PM2.5Good
8 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
11 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
48 Āµg/mĀ³
Elevated levels irritate airways and can worsen asthma symptoms.
Nitrogen Dioxide (NO2)Good
7.3 Āµg/mĀ³
A respiratory irritant from vehicle exhaust that can trigger inflammation in sensitive airways.
Sulfur Dioxide (SO2)Good
0.9 Āµg/mĀ³
Even brief exposure can tighten airways, especially for people with asthma.
Carbon Monoxide (CO)Good
181 Āµg/mĀ³
High levels reduce oxygen delivery in the body, compounding breathing difficulty on high-pollen days.
See the full San Jose air quality report ā†’

Weather in San Jose Today

ā˜€ļø
Weather
53Ā°F
Clear
Humidity
88%
Wind
2 mph WNW
Feels Like
52Ā°F
Pressure
1013 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 ā†’

Get free daily pollen alerts

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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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