Low
Pollen is low — most people won't notice
Grass pollen is the main trigger · Tomorrow → · Updated 12 hours ago
Today in San Antonio: grass pollen is very low, tree pollen is none, weed pollen is none. Overall score: 6/100. Allergies are unlikely for most people right now. Tomorrow is expected to be about the same. Updated at 1:01 AM.
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Pollen levels in San Antonio are currently low. Most people should not experience allergy symptoms from pollen.
Tree pollen: None. Grass pollen: Very Low. Weed pollen: None.
Tomorrow's pollen forecast for San Antonio is expected to be about the same, with low pollen conditions.
Grass pollen is the highest supported pollen type in San Antonio today. Grass pollen is very low.
Tree pollen in San Antonio is none today.
Grass pollen in San Antonio is very low today.
Weed pollen in San Antonio is none today.
Tomorrow's pollen forecast for San Antonio is expected to be about the same, with low pollen conditions.
The allergy forecast in San Antonio is low today based on the supported tree, grass, and weed pollen data shown on this page.
This forecast tracks supported tree, grass, and weed pollen for San Antonio. Cedar can be part of local tree-pollen season, but this page does not show a separate cedar or mold count unless source data provides it.
San Antonio sits at the edge of the Texas Hill Country, and its warm, humid subtropical climate combined with a long growing season makes it one of the most challenging allergy cities in the United States. The area is especially infamous for its winter "cedar fever" outbreak, when mountain cedar (Ashe juniper) releases massive pollen loads from mid-December through February.
As cedar subsides, a second tree wave takes over in spring, with oak, ash, elm, pecan, mulberry, and hackberry peaking from February through April; oak pollen in particular can blanket the city in yellow dust. Grass pollen follows, dominating from late April into summer and often lingering through early fall, driven largely by Bermuda, Johnson, and Timothy grasses.
Weed season arrives in late summer and fall, with ragweed leading the charge from August through October, alongside pigweed, careless weed, and sagebrush. Overlap is common—late-spring tree and grass pollen frequently coincide, intensifying symptoms.
Beyond pollen, San Antonio's humidity fuels year-round mold spores (especially Alternaria and Cladosporium), while dust, cedar elm debris, and occasional Saharan dust plumes add to the burden. Overall, the city's allergy profile is defined by its severe cedar season, diverse tree and weed exposure, and nearly year-round symptom potential.