Climate & Weather in Schertz
Schertz shares San Antonio's humid subtropical climate -- long, genuinely hot summers and mild winters -- with two real local wrinkles worth naming: spring is severe-thunderstorm and hail season, and Cibolo Creek's documented flash-flood history (see the insurance-hazard-costs topic page) means intense rain is a real, planned-around hazard here, not just an inconvenience.
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Learn moreSummer: Long and Genuinely Hot
As across the San Antonio metro, Schertz summers run long and hot, with the region averaging around 18 days a year at 100°F or higher, concentrated July through September, per NOAA-sourced regional climate data reviewed August 2026 (see San Antonio's climate-weather topic page for the full regional figures, which apply directly to Schertz given its close proximity). A specific Schertz-only temperature dataset distinct from the broader San Antonio metro reading was not separately sourced this pass -- treat the regional figures as representative.
Spring: Severe Thunderstorm and Hail Season
Spring is the region's primary severe-weather season, when the combination of Gulf moisture and frontal systems produces the hail and severe thunderstorms that drive Central Texas homeowners-insurance costs (see the insurance-hazard-costs topic page). Texas leads the nation in hail-related insurance claims most years, and the I-35 corridor running through Schertz is specifically cited as part of that hail-prone pattern.
Winter: Mild, With Occasional Cold Snaps
Winters in Schertz are mild by most national standards, consistent with the broader San Antonio-area climate -- though the region, like much of Texas, is not immune to occasional severe cold-snap events (Texas's February 2021 statewide winter storm remains the best-known recent example). Treat mild winters as the norm, not an absolute guarantee.
Cibolo Creek and Flash Flooding
Beyond general severe-weather risk, Cibolo Creek -- which runs through Schertz -- has a documented, recurring flood history, most recently a disaster declaration and evacuations in mid-July 2026 when the creek crested around 22.5 feet, with earlier significant floods in October 1998, 2000, and 2002 (see the insurance-hazard-costs topic page for full sourcing). Intense rain events near the creek are a real, planned-around feature of life for nearby properties, not a rare occurrence.
Key takeaways
- Humid subtropical climate, consistent with the broader San Antonio metro: long, hot summers (regionally, about 18 days/year at 100°F or higher, concentrated July-September) and mild winters.
- Spring is severe-thunderstorm and hail season -- the dominant driver of Central Texas homeowners-insurance costs, with the I-35 corridor through Schertz specifically cited as hail-prone.
- Winters are mild by national standards, though Texas is not immune to occasional severe cold-snap events (e.g., February 2021).
- Cibolo Creek has a real, documented, recurring flash-flood history (most recently mid-July 2026) -- a genuine, planned-around hazard distinct from the region's broader hail risk.
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