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Overview
San Antonio receives roughly 29.7 inches of precipitation per year at an average of 71.1 F, which means it limited rainfall with seasonal storm spikes.
The broader Texas climate, including seasonal humidity peaks and storm activity, shapes the indoor moisture environment alongside local conditions.
San Antonio has hot summers and variable rainfall, with heavy rain events that can drive indoor moisture.
San Antonio outlines property responsibilities for maintenance and code compliance.
This guide highlights local moisture drivers, seasonal risk, and prevention steps. For legal rights and landlord obligations, review the Texas mold laws guide.
Sources: [Texas - Drainage | Britannica] | [San Antonio Property Responsibilities] | [NOAA Climate Normals - SAN ANTONIO STINSON AP, TX US]
Action Checklist
San Antonio Home Inspection Checklist
Common construction types in San Antonio affect where moisture problems develop. Here is how local building patterns shape what to inspect.
In San Antonio, property responsibilities outline maintenance expectations for compliance.
Documenting moisture issues helps support inspection follow up.
Sources: [San Antonio Property Responsibilities]
- Roughly 29.7 inches of annual rain in San Antonio means gutter maintenance and drainage checks should be part of the routine.
- Roof flashing, gutters, and downspout extensions.
- Window and door seals after heavy rain.
- HVAC condensate drain lines and drip pans.
- Bathroom exhaust fans and vent ducts.
- Slab edges, garage walls, and utility penetrations.
- Laundry hoses and shutoff valves.
- Under sink plumbing and cabinet bases.
Sources: [EPA Mold, Moisture, and Your Home] | [NOAA Climate Normals - SAN ANTONIO STINSON AP, TX US]
Warning Signs of Mold in San Antonio
Watch for these signs that moisture is lingering in San Antonio homes and rentals:
- In San Antonio, where average temperatures reach 71.1 F, condensation on windows during warmer months points to a moisture imbalance indoors.
- Musty odors after storms or humid stretches.
- Condensation on windows or AC supply vents.
- Peeling paint near baseboards or window trim.
- Dark spotting near ceiling corners.
- Soft drywall around tubs or showers.
Sources: [EPA Mold, Moisture, and Your Home] | [NOAA Climate Normals - SAN ANTONIO STINSON AP, TX US]
Mold Risk Factors in San Antonio
These are the most common moisture drivers for homes and rentals in San Antonio:
- San Antonio averages 29.7 inches of precipitation per year, so storm events and small leaks both matter.
- Hot summers increase cooling and condensate loads.
- Heavy rain events test roofs and window seals.
- Warm, humid stretches slow drying after leaks.
- Slab edges and lower walls can stay damp after storms.
- Plumbing leaks in kitchens and baths can spread unnoticed.
Sources: [Texas - Drainage | Britannica] | [EPA Mold, Moisture, and Your Home] | [NOAA Climate Normals - SAN ANTONIO STINSON AP, TX US]
San Antonio Seasonal Risk Calendar
Spring
Thunderstorms increase. Inspect roof edges and window seals after heavy rain.
Summer
An average of 71.1 F drives extended cooling seasons. Monitor HVAC condensate and use dehumidifiers in below-grade spaces.
Fall
Storms return. Clear gutters and confirm drainage.
Winter
Cooler air lowers humidity, but condensation can form in tight homes.
Sources: [Texas - Drainage | Britannica] | [NOAA Climate Normals - SAN ANTONIO STINSON AP, TX US]
San Antonio Moisture Playbook
Use this short playbook to stay ahead of common moisture problems in San Antonio.
After a Leak
Stop the leak, remove wet materials within 24 to 48 hours, and dry with airflow and dehumidification.
Monthly Maintenance
Clear condensate lines, inspect under sinks, and log indoor humidity.
Seasonal Tune Up
Before storm season, clear gutters and inspect flashing; about 29.7 inches of annual precipitation means small leaks can add up.
Sources: [EPA Mold, Moisture, and Your Home] | [NOAA Climate Normals - SAN ANTONIO STINSON AP, TX US]
Mold Prevention in San Antonio
Use these priorities to keep indoor humidity low and avoid recurring growth:
- Gutters and downspouts need regular clearing to handle 29.7 inches of yearly precipitation and keep water away from the foundation.
- Maintain indoor humidity between 30 and 50 percent.
- Dry wet materials within 24 to 48 hours.
- Vent bathrooms and kitchens outdoors.
- Clear gutters and direct downspouts away from foundations.
- Inspect roof flashing and window seals before storm season.
- Service HVAC condensate drains annually.
Sources: [EPA Mold, Moisture, and Your Home] | [NOAA Climate Normals - SAN ANTONIO STINSON AP, TX US]
Local Regulations
Some cities in Texas publish additional housing rules or enforcement guidance that can affect mold complaints.
State Laws and Rights
Texas mold law snapshot
Texas has mold-specific rules in addition to general habitability standards.
Texas recognizes an implied warranty of habitability requiring landlords to maintain rental properties in a condition fit for human habitation. Under Texas Property Code Section 92.052, landlords must make a diligent effort to repair conditions that materially affect the physical health or safety of an ordinary tenant. While mold is not specifically mentioned in the statute, courts have applied this standard to mold issues when they pose health risks. Examples of conditions affecting health and safety include sewage backups, roaches, rats, no hot water, faulty wiring, and roof leaks. Mold caused by these types of conditions falls under the landlord's duty to repair.
Use the full Texas guide for tenant rights, landlord responsibilities, and remedies.