National Weather Service United States Department of Commerce
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Last Map Update: Mon, May 12, 2025 at 4:10:29 pm CDT

An early season heat wave develops this week across South Central Texas, and peaks from mid to late week. Many will not be acclimated to this type of heat so early within the year and thus the risk for heat related illness is higher than normal. Please practice heat safety! Temperatures have a high chance of setting new daily record highs and are expected to near, if not exceed, all-time record highs for the month of May.
Practice Heat Safety wherever you are. Job Sites: stay hydrated and take breaks in the shade as often as possible. Indoors: Check up on the elderly, sick and those without AC. Vehicles: Never leave kids or pets unattended - LOOK before you LOCK. Outdoors: Limit strenuous outdoor activities, find shade, and stay hydrated. Heat-related deaths are preventable. Protect yourself and others from the impacts of heat waves.
Heat Impacts on Vulnerable Populations. Everyone is at risk from the dangers of extreme heat, but these groups are more vulnerable than most: pregnant, newborns, children, elderly, chronic illness. Age and certain conditions make the body less able to regulate temperature. Never leave anyone alone in a closed car. Use air conditioners and stay in the shade. Drink plenty of water, even if not thirsty. Wear loose-fitting, light-colored clothing.
he warming trend continues this afternoon with highs ranging from the low 90s over the Hill Country and Coastal Plains to upper 90s along the Rio Grande. Skies remain mostly clear.
Partly cloudy skies are expected tonight. Low temperatures will be warmer than this morning's, with lows generally in the lower to mid 60s, with upper 60s near the Rio Grande.
The main story this week will be the unusually hot high temperatures for this time of year, with most locations reaching 100 degrees or greater each afternoon. Cloud cover will increase a bit later in the week, but likely won't have much cooling impact. Heat-related impacts will be possible Tuesday onwards given the rapid shift to abnormally warm temperatures. Ensure you have access to cooling and plentiful hydration.