San Antonio has already seen heavy rainfall once this week, as a line of storms swept through Bexar County late Tuesday night and into early Wednesday. Most areas saw about an inch to 1.5 inches of rain. However, a few spots on the North Side — including Shavano Park, Helotes and Hollywood Park — recorded between 2 and 2.5 inches.
A cluster of showers and storms developed overnight west of San Antonio, near Del Rio. Some of these thunderstorms are expected to move into the Interstate 35 corridor early Thursday.
San Antonio will have about a 50% chance of rain, with the most likely rainfall coming between 3 a.m. and 8 a.m. Thursday. Some storms could produce heavy downpours, making travel potentially hazardous during the morning commute.
For most areas, rainfall totals are likely to be less than a half-inch. However isolated totals of 2 inches or more could result in isolated flash flooding. If you must travel, take it slow, and do not attempt to drive over flooded roadways.
Expect drier weather across the region by the late morning and afternoon, with even some sunshine across Central and South Texas. San Antonio daytime temperatures will stay slightly below average in the lower 80s, but humidity levels will also stay elevated.
A few pop-up showers or storms are also possible during the afternoon, but those rain chances will only be around 30%.
Friday: A lull in the storm activity is expected on Friday, with only a 20% to 30% chance of a few scattered storms in the area during the afternoon and evening. Temperatures are likely to rise into the mid-80s, with humidity-driven heat index values reaching the lower 90s.
Saturday: Rain chances will once again rise significantly overnight Friday and into Saturday morning, with off-and-on rainfall possible into the afternoon and evening as well. Overall rain chances in San Antonio will be around 70%, and some storms could bring heavy downpours and a potential for flash flooding.
Sunday: Moisture is expected to shift farther east on Sunday, which will cause rain chances in San Antonio to fall to around 40%. Isolated downpours are still possible, but San Antonio will likely be dry for the majority of the day, as temps once again rise into the mid-80s.
Monday: Rain chances will continue to decrease on Memorial Day, with only a 20% chance of an isolated shower or storm expected in San Antonio.
Outside of the slight storm chance, fairly pleasant weather is shaping up in San Antonio for the holiday. Morning temps near 70 degrees will transition into afternoon highs in the mid-80s under partly cloudy skies. Humidity, however, could push heat index values, or “feels like” temps, into the low 90s.