Weather Heat index may top 110° during the afternoon Justin Horne, KSAT Weather Authority Meteorologist Published: June 17, 2026 at 5:09 AM Tags: Forecast FORECAST HIGHLIGHTS TODAY: Hot & humid, heat index 100-105° EXTREME HEAT THURSDAY: Highs upper 90s, heat index 108-112° STORM CHANCE FRIDAY NIGHT: Next chance of rain is late Friday, Saturday FORECAST TODAY We may briefly get Tropical Storm Arthur in the Gulf this afternoon, however, it will not have any impacts on our forecast (other...