Napa pollen forecast — Sterling Vineyards neighborhood
Today (9 August) pollen in Sterling Vineyards, Napa is high; mugwort is high; cypress, grass, and ragweed are low. Tomorrow (10 August 2026) levels are similar - mugwort declining. Over the following five days cypress, grass, mugwort, and ragweed will increase. Forecasts are calculated by Airmine using satellites to map local vegetation and determine pollen season onset.
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Developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team
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Sterling Vineyards is a wine country with valley oaks, olive trees, and acres of grapevines. Olive pollen is a major allergen here — trees bloom in May and June. Valley fog mornings give way to warm afternoons that launch pollen into the air.
Today - 9 August
-
Alder (Alnus):
None
0/100
-
Birch (Betula):
None
0/100
-
Hazel (Corylus):
None
0/100
-
Cypress (Cupressaceae):
Low
5/100
-
Grass (Poaceae):
Low
5/100
-
Willow (Salicaceae):
None
0/100
-
Mugwort (Artemisia):
High
61/100
-
Ragweed (Ambrosia):
Low
25/100
High pollen levels may trigger sneezing, itchy eyes, and congestion. Airmine's neighbourhood estimates use satellites to map local vegetation and a statistical prediction model, updated four times daily.
Tomorrow - 10 August
-
Alder (Alnus):
None
0/100
-
Birch (Betula):
None
0/100
-
Hazel (Corylus):
None
0/100
-
Cypress (Cupressaceae):
None
0/100
-
Grass (Poaceae):
None
0/100
-
Willow (Salicaceae):
None
0/100
-
Mugwort (Artemisia):
Medium
35/100
-
Ragweed (Ambrosia):
None
0/100
Other Landmarks in Napa
Sports venues in Napa
Frequently Asked Questions
Is pollen high in Napa right now?
On 9 August 2026, overall pollen levels in Napa are high. Artemisia is the main contributor to airborne pollen, while ambrosia, cypress, and grass remain at lower levels
Will pollen levels change in Napa tomorrow?
On 10 August 2026, pollen conditions in Napa will be different from today, with artemisia continuing to decline
Is pollen expected to decrease in Napa this week?
According to the five-day outlook, ambrosia, artemisia, cypress, and grass pollen levels will increase later in the week.
Which pollen types are currently active in Napa?
On 9 August 2026, Artemisia is the dominant pollen source in Napa. ambrosia, cypress, and grass are also present but at lower levels.
When is pollen season in Napa?
How often is the Napa pollen forecast updated?
The Napa pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Napa come from nearby or far away?
Studies show that most pollen exposure (often 70–90%) comes from nearby sources, such as local trees and vegetation. A good pollen forecast therefore depends on accurately representing local vegetation. Pollen can travel long distances, but this usually matters only early in the season or during specific wind events.
Are pollen levels in Napa based on measurements or forecasts?
Pollen data is often misunderstood. Most "pollen levels" are not real-time measurements, but forecasts.
Direct pollen measurements are typically delayed by 1-2 days because they require manual analysis. To show current conditions in Napa, modern forecasts combine recent measurements, weather data, and information about local vegetation.
This allows us to estimate pollen levels for today and the coming days, not just report the past.
Airmine’s atmospheric monitoring platform was developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team, using satellite and Earth observation technologies to improve emissions monitoring.
Want to see pollen forecasts for other cities in United States?
Check pollen in other popular cities:
Data provided by Airmine — Last update: 10 August 2026 at 02:34 CEST (Data is updated four times daily.)
This page provides the latest public pollen forecast for Sterling Vineyards, Napa.
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Unless explicitly made clear, the content on this site has not been paid for by external organisations and is Airmine's sole responsibility.
Disclaimer: Forecasts are provided for informational purposes only and should not be relied upon as medical advice. Actual pollen and air quality conditions may vary from the forecast. If you have allergies, asthma, or another medical condition, consult a healthcare professional. Please see our Terms of Service for important information about limitations of liability.