San Jacinto pollen forecast - today, tomorrow and the week ahead
Today (9 August) pollen in San Jacinto is medium; mugwort is medium; ragweed is low. Tomorrow (10 August 2026) levels are similar. Over the following five days 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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San Jacinto's Riverside County California inland valley setting features olive, pepper tree, and cottonwood as the main tree pollen sources, with exposure varying between the limited greener residential areas along the San Jacinto River and the more built-up commercial corridors along Ramona Expressway. The San Jacinto River corridor provides the most significant local green space, while the San Jacinto Mountain backdrop creates dramatic downslope wind conditions that concentrate pollen in the valley floor.
Today - 9 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
46/100
-
Ragweed (Ambrosia):
Low
23/100
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
41/100
-
Ragweed (Ambrosia):
Low
19/100
Air quality in San Jacinto
View air qualityFrequently Asked Questions
Is pollen high in San Jacinto right now?
On 9 August 2026, overall pollen levels in San Jacinto are moderate. Artemisia is the main contributor to airborne pollen, while ambrosia remain at lower levels
Will pollen levels change in San Jacinto tomorrow?
On 10 August 2026, pollen conditions in San Jacinto will be similar to today, with ambrosia at low levels, artemisia at medium levels
Is pollen expected to decrease in San Jacinto 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 Jacinto?
On 9 August 2026, Artemisia is the dominant pollen source in San Jacinto. ambrosia are also present but at lower levels. cypress and grass are not currently active.
When is pollen season in San Jacinto?
How often is the San Jacinto pollen forecast updated?
The San Jacinto pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in San Jacinto 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 Jacinto 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 Jacinto, 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 San Jacinto.
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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.