san antonio weather
United States ·
If you live in San Antonio, you know the drill: the weather doesn’t ease into the day—it throws a curveball around midnight and then bakes you by lunch. Tonight’s San Antonio weather is a textbook example. With temperatures hovering at 73°F and an 80% chance of rain, the National Weather Service has issued a Flash Flood Warning for six counties across the region. The heaviest activity is expected between 3 AM and 6 AM, with thunderstorm chances still sitting at 60-80%. Sunrise at 6:35 AM won’t bring immediate relief—those storms could linger into the early morning hours.
A Night of Risk, a Morning of Uncertainty
Flash flooding is the primary concern overnight. San Antonio weather patterns often feature slow-moving storms that can dump several inches of rain in a short time, overwhelming drainage systems in low-lying areas. If you’re driving during the early morning hours, it’s critical to avoid flooded roads and monitor local alerts. The warning covers a broad area, so even if your neighborhood stays dry, adjacent counties might see dangerous conditions. The thunderstorm probability remains high through dawn, meaning the commute could be slick and delayed.
The Dramatic Switch to Sunday
By Sunday noon, the script flips completely. The forecast shows 0% rain, clear skies, and a high near 95°F. That’s the signature San Antonio weather cycle: a night of thunderstorms and flooding risk, followed by a bone-dry, scorching afternoon. The rapid transition from wet to dry isn’t just uncomfortable—it can catch people off guard. If you’re planning outdoor activities for Sunday, wait until late morning to confirm conditions. The heat will ramp up quickly after the clouds clear, so hydration and sun protection become the priority.
Plan for the Whiplash
This isn’t an anomaly; it’s the rhythm of spring and early summer in South Texas. The same system that brings overnight flood threats can leave behind clear skies and oppressive heat by midday. For now, keep your Sunday morning flexible. Check the updated San Antonio weather before making firm plans. The flood risk will fade by mid-morning, but the heat index could spike into the triple digits by early afternoon. That’s San Antonio weather—always giving you something to watch, and always keeping you on your toes.