San Antonio, TX Ragweed Pollen
Ragweed pollen in San Antonio usually peaks around September, reaching Very High at its worst. San Antonio sits at the southern edge of the Hill Country, so its allergy year is bookended by two heavy hitters: mountain cedar in winter and ragweed in fall, with oak and grass filling the spring.
Ragweed builds after mid-August and runs through October, the fall counterpart to winter's cedar.
Ragweed in San Antonio today
Monday, July 27, 2026
Ragweed pollen by month in San Antonio
How ragweed usually runs across the year. The current month is outlined.
Managing ragweed season in San Antonio
If ragweed is your trigger, start a daily antihistamine like cetirizine (Zyrtec) or loratadine (Claritin) a week or two before the September peak, rather than waiting for symptoms. Keep windows closed on high-count mornings, shower and change clothes after time outside, and run the AC on recirculate in the car.
When symptoms don't ease with over-the-counter medicine, an allergist in Texas can test whether ragweed is really what you react to and talk through longer-term options like allergy shots.
Sources
More pollen in San Antonio
- San Antonio oak pollen — peaks March.
- San Antonio mountain cedar pollen — peaks January.
- San Antonio grass pollen — peaks May.
- San Antonio pollen calendar — every allergen, month by month.
- San Antonio pollen count today — live tree, grass, and weed levels with a 5-day forecast.
- Texas pollen season — the statewide calendar and other cities.
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Sign up for free alertsSeasonal pattern based on Texas pollen data and local sources. Today's reading updated daily. MyPollenPal