San Antonio, Texas – South Texas is sweltering under a dangerous early-season heat wave, with heat index values approaching 110°F and little overnight relief expected through Tuesday. Inland areas near Laredo and the Rio Grande Valley are seeing triple-digit highs in the upper 100s, intensifying heat-related health risks.
According to the National Weather Service, a persistent high-pressure system parked over southern Texas is driving this stretch of extreme temperatures. Widespread record-breaking heat is likely through at least May 20, with overnight lows staying in the upper 70s across much of the region. These unusually warm nights provide minimal recovery time for people and infrastructure stressed by the daytime heat.
Cities from Corpus Christi to McAllen are under major heat risk categories, with some areas approaching the “extreme” threshold. Residents without reliable air conditioning or access to cooling shelters are especially vulnerable. Officials urge the public to stay hydrated, avoid outdoor activity during peak afternoon hours, and check on neighbors and elderly relatives.
This pattern of excessive heat is expected to persist into next week. A moderate risk (40–60%) of continued high temperatures is forecast for May 22, with the potential for additional heat alerts to be issued. Stay tuned to local agencies for updated advisories and safety information.
