San Marcos pollen forecast - today, tomorrow and the week ahead
Today (25 June) pollen in San Marcos is none Tomorrow (26 June 2026) levels are similar. Forecasts are calculated by Airmine using satellites to map local vegetation and determine pollen season onset.
For long term forecasts and maps, see the Airmine app
Developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team
San Marcos' parks in Texas and the San Marcos River corridor feature oak, cedar, and elm as the main tree pollen sources, with exposure varying between these green areas and the more built-up city centre. Surrounding Texas Hill Country contributes substantial cedar and grass pollen, while the river valley channels airflows and concentrates pollen across the city under prevailing southerly winds.
Today - 25 June
-
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
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 - 26 June
-
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
Pollen forecast for neighborhoods and landmarks in San Marcos
Frequently Asked Questions
Is pollen high in San Marcos right now?
Currently, there is no significant pollen in San Marcos.
Will pollen levels change in San Marcos tomorrow?
On 26 June 2026, pollen conditions in San Marcos will be similar to today with no significant pollen expected.
Is pollen expected to decrease in San Marcos this week?
According to the five-day outlook, grass pollen levels will increase later in the week.
Which pollen types are currently active in San Marcos?
On 25 June 2026, there are no significant pollen types in San Marcos.
When is pollen season in San Marcos?
How often is the San Marcos pollen forecast updated?
The San Marcos pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in San Marcos 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 Marcos 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 Marcos, 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: 25 Jun 2026, 09:00 CET (Data is updated four times daily.)
This page provides the latest public pollen forecast for San Marcos.
For long term forecasts and maps, see the Airmine app
Developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team
Unless explicitly made clear, the content on this site has not been paid for by external organisations and is Airmine's sole responsibility.