FORECAST HIGHLIGHTS
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DANGEROUS HEAT TODAY: 90s + thick humidity = heat index values near 110°
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STORMS LATE FRIDAY?: Possible, will depend on storms to our north
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SATURDAY: Threat for a few storms continues, cooler
FORECAST
HEAT INDEX TO SOAR TODAY
After brief bout of morning cloud cover, full afternoon sunshine will help to push temperatures into the upper-90s. Meantime, the humidity will be especially thick today. This will allow heat index values to top 100° as soon as the noon hour. By peak heating, ‘feels like’ temperatures could reach 110°, if not a bit higher. Excessive Heat Warnings are in effect today.
Heat index to soar today (Copyright KSAT-12 2026 – All Rights Reserved)
FRIDAY
Pre-dawn on Friday, a few storms may try to work into the area from the northwest. At this time, we expect this activity to stay north of San Antonio.
Temperatures will cool slightly tomorrow thanks to added cloud cover. That said, it’ll still be hot and humid, and heat index values may still jump above 100°. Outflow boundaries from storms to our north may help to fire storms Friday evening and Friday night. In this type of setup, these random outflow boundaries will be the deciding factor as to where storms develop.
A chance for storms returns Friday evening through Saturday (Copyright KSAT-12 2026 – All Rights Reserved)
SATURDAY
Rain chances continue into Saturday, but like Friday, the distribution of storms will depend on outflow boundaries. Odds currently sit at 50% through Saturday afternoon. It won’t be raining all day, but some could see heavy rainfall.
Quieter weather is expected Sunday for Father’s Day.
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