San Antonio rolled into Monday, April 20, 2026, under a blanket of clouds and a chill in the air, with temperatures sitting around 59°F and an east‑northeast breeze already at work. Showers and scattered thunderstorms are expected to hang around through the day, keeping the high near 62°F and turning the commute into a wet slog. Wind gusts could push into the mid‑20s mph this afternoon, so drivers should bank on slower traffic and slick roads.
Storms, Heavy Rain, and Flooding Risk
According to NWS Austin/San Antonio, a Level 1 excessive‑rainfall threat is in place for parts of South‑Central Texas, and the stronger cells could dump 2–3 inches of rain in spots, which is plenty to cause ponding on roads and brief flash flooding. East‑northeast winds of 5–10 mph with gusts up to 25 mph are expected this afternoon and evening, adding a bit of extra punch to the stormy setup.
Timing And Travel Impacts
Forecast models and local outlooks point to the main window for heavier rain arriving from mid‑afternoon into the evening, with more rounds possible overnight into Tuesday. The Express‑News reports that San Antonio could see 1–2 inches of rain through Tuesday, with isolated higher totals on the table, a setup that could put a damper on evening plans downtown. Drivers should be ready for intermittent heavy downpours, lightning and quick drops in visibility during the commute.
What To Do Today
Give yourself extra time to get where you are going, ease off the gas around standing water and never drive around barricades or into closed low‑water crossings. Tie down or bring in loose outdoor items, and keep a flashlight and phone charger close in case of short power interruptions. Anyone living in low‑lying neighborhoods should keep an eye on conditions and be ready to move to higher ground if water levels start to rise.
Looking Ahead
The cool and soggy pattern is expected to linger through Tuesday, with highs mainly in the upper 60s to low 70s before a warmer, drier stretch moves in by midweek. Forecasts point to a rebound into the low‑80s by Wednesday and the mid‑80s to upper‑80s by Thursday and Friday, with only isolated storm chances late in the week.
