Bexar County, Texas · San Antonio
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Bexar County averages 1 night a year at 20°F or colder, mostly midwinter, and 16% of its homes predate 1960.
Basements flood here mostly in May. Bexar County averages 6.8 days a year with an inch of rain or more.
Sewage backups in Bexar County spike on heavy-rain days, about 6.8 a year, when sewer mains fill up and water finds the lowest drain.
Roof leaks here come from summer downpours. Most show up as ceiling stains in the room below.
1% of occupied homes in Bexar County heat mainly with wood or propane, below the Texas county median of 6.5%.
Muggy summer nights, lows of 65°F or more, come about 161 times a year in Bexar County. Mold after a leak spreads fastest from June through August.
Local risk profile
About 2,067,341 people live in Bexar County, 1,240 square miles in southern Texas, in roughly 820,780 homes. Besides San Antonio, the county seat, the biggest communities are Timberwood Park, Converse and Universal City. Much of its housing is recent, with a median build year of 1990.
40/100 Water Damage Risk Index: Moderate Bexar County ranks 189 of 232 Texas counties. See the statewide ranking and method.The three factors where Bexar County ranks highest compared with other Texas counties.
Winters here are on the gentler end for Texas, and pipes still freeze. It averaged 11 freezing nights a year over 2015–2024, 1 of them at 20°F or colder, cold enough for pipes in outside walls and crawl spaces to freeze. Among 232 Texas counties that's 159th.
The longest cold spell was straight 4 days without the temperature rising above freezing, ending in February 2021. The coldest night reached about 11°F on February 16, 2021. Burst pipes usually show up when a spell like that breaks and the ice thaws.
Hard freezes are uncommon here, about 11 nights a year at or below 32°F, and that's exactly why they do damage: pipes in attics, exterior walls and slab-edge plumbing are rarely insulated. The coldest night in the record was about 11°F on February 16, 2021.
Rainfall is about average for Texas. Of roughly 28.2 inches of yearly precipitation, the damage comes from the 6.8 days a year with an inch or more, ranked 133rd of 232. May, August and September see the most. The single wettest day in the record: 3.73 inches, September 26, 2016. The worst three-day stretch dropped 5.84 inches, ending December 5, 2016, the kind of soaking that overwhelms sump pumps and storm sewers.
Housing
Roughly 36% of the county's housing was built before 1980. That puts Bexar among the newer housing stocks of Texas's 232 counties.
Growth since 2000 added 39% of today's homes. In houses that new, the weak points are washing machine hoses, ice maker lines, water heaters and sump pumps rather than the pipes in the walls.
About 25% of homes went up between 1980 and 1999. Some houses from the late 1970s to the mid-1990s were plumbed with polybutylene, a gray plastic pipe known for failing at fittings. A plumber can tell you in a few minutes whether you have it.
Renters occupy 41% of homes. If you rent, the building is usually the landlord's to repair, but your belongings are only covered by renters insurance.
Beyond water
Summer nights that don't drop below 65°F, a good marker of humid air, come about 161 times a year here, above the Texas county median of 129. Keep indoor humidity under 60%, as the EPA advises, and dry any leak within 24 to 48 hours; in a humid month a wet basement left alone won't dry by itself.
Mold remediation: what to expectMain heating fuel in Bexar County's occupied homes: 28% utility gas, 70% electric, 1% propane and under 1% wood. Heating equipment, cooking and electrical failures cause most home fires nationally. Even a small kitchen fire can leave soot through the whole house, because smoke follows air currents into closets, ducts and attic space.
Fire and smoke cleanup: first stepsCoverage
Calls connect to restoration companies that work across Bexar County. The largest communities by population:
Population from ACS 2020-2024 5-year estimates. Townships and unincorporated areas are covered too.
Nearby
Bandera and Kendall get more pipe-freeze nights than Bexar. Its housing is the oldest in the area by share of homes built before 1980.
By the numbers
| Factor | Bexar | Texas median | Rank |
|---|---|---|---|
| Homes built before 1960 | 16% | 20% | 148 of 232 |
| Homes built before 1980 | 36% | 46% | 167 of 232 |
| Homes built 2000 or later | 39% | 26% | 39 of 232 |
| Manufactured or mobile homes | 2.7% | 13% | 225 of 232 |
| Vacant homes | 8.5% | 17% | 200 of 232 |
| Wood or propane heat | 1.1% | 6.5% | 225 of 232 |
| Nights at 20°F or colder | 1/yr | 3/yr | 159 of 232 |
| Days with 1 inch+ of rain | 6.8/yr | 7.8/yr | 133 of 232 |
| Freeze-thaw days | 10/yr | 27/yr | 182 of 232 |
| Muggy nights (65°F+) | 161/yr | 129/yr | 49 of 232 |
Rank 1 is the highest value. Bars run from the lowest to the highest Texas county; the tick marks the median; orange means higher water damage risk than the median, green means lower.
Questions
Peak risk months in Bexar County: freezing from midwinter, heavy rain in May, August and September.
Sources: U.S. Census Bureau, ACS 2024 5-year estimates (2020-2024); weather from NOAA nClimGrid-Daily county averages (EpiNOAA), 2015–2024, averaged across the county; county boundaries from Census TIGER. Reviewed 2026-10-21. Methodology