San Luis Obispo pollen forecast - today, tomorrow and the week ahead
Today (9 August) pollen in San Luis Obispo is high; mugwort is high; ragweed is medium; cypress and grass are low. Tomorrow (10 August 2026) levels are similar - grass remains low, mugwort remains high, ragweed remains medium. 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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San Luis Obispo's setting on a valley between coastal hills on California's Central Coast supports coast live oak, chaparral on the hillsides, and eucalyptus groves as the leading local vegetation, all factoring into the pollen count through the year. Wind patterns across the area help determine how far pollen travels from these source plants. The mix of native and introduced species here is fairly typical for this part of the country.
Today - 9 August
-
Alder (Alnus):
None
0/100
-
Birch (Betula):
None
0/100
-
Hazel (Corylus):
None
0/100
-
Cypress (Cupressaceae):
Low
9/100
-
Grass (Poaceae):
Low
18/100
-
Willow (Salicaceae):
None
0/100
-
Mugwort (Artemisia):
High
60/100
-
Ragweed (Ambrosia):
Medium
40/100
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):
Low
12/100
-
Willow (Salicaceae):
None
0/100
-
Mugwort (Artemisia):
High
51/100
-
Ragweed (Ambrosia):
Medium
33/100
Air quality in San Luis Obispo
View air qualityFrequently Asked Questions
Is pollen high in San Luis Obispo right now?
On 9 August 2026, overall pollen levels in San Luis Obispo are high. Artemisia is the main contributor to airborne pollen, while ambrosia, cypress, and grass remain at lower levels
Will pollen levels change in San Luis Obispo tomorrow?
On 10 August 2026, pollen conditions in San Luis Obispo will be different from today, with ambrosia at medium levels, artemisia at high levels, grass at low levels
Is pollen expected to decrease in San Luis Obispo 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 San Luis Obispo?
On 9 August 2026, Artemisia is the dominant pollen source in San Luis Obispo. ambrosia, cypress, and grass are also present but at lower levels.
When is pollen season in San Luis Obispo?
How often is the San Luis Obispo pollen forecast updated?
The San Luis Obispo pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in San Luis Obispo 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 San Luis Obispo 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 San Luis Obispo, 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: 9 August 2026 at 20:27 CEST (Data is updated four times daily.)
This page provides the latest public pollen forecast for San Luis Obispo.
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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.