San Antonio’s hot climate—often humid during the warm season and boosted by periodic heavy rains—creates ideal conditions for mosquitoes for much of the year. From creek corridors and drainage channels to irrigated lawns, retention ponds, and the everyday “small water” spots around homes (gutters, planters, birdbaths, and low spots), mosquitoes in Bexar County can stay active for long stretches, with the heaviest pressure typically ramping up from late spring through early fall (and sometimes earlier when spring rains arrive fast).
Texas has about 85 mosquito species, but only a small number account for most of the biting, nuisance activity, and the disease concerns people think about day-to-day around San Antonio.
Perhaps the most recognizable mosquito in San Antonio thanks to its black-and-white striped legs and aggressive biting behavior.
Active mostly during the daytime, especially early morning and late afternoon.
Breeds in small amounts of standing water — flowerpots, gutters, birdbaths, yard debris, and even bottle caps.
Known for being highly resilient and a major nuisance in residential areas.
Less common than Aedes albopictus in Texas but still present in warmer urban pockets.
Prefers to live close to human homes and bites primarily during the day.
Known globally as a vector for Zika, dengue, and yellow fever — though these diseases are not typically transmitted locally in Texas.
These nighttime-biting mosquitoes are most active from dusk through early morning.
They prefer stagnant, organic-rich water such as storm drains, ditches, birdbaths, clogged gutters, and ponds.
Main carriers of West Nile virus in Texas, which is detected in mosquito pools across the Atlanta metro area each summer.
Populations increase significantly during hot, humid weather following heavy rain.
Found near ponds, marshes, and still bodies of freshwater.
Active mostly at night and around dusk.
Historically associated with malaria transmission in the United States, though malaria is no longer endemic in Texas.
