Wednesday, May 20, 2026, started off gray and soupy in Austin, with mostly cloudy skies, muggy air, temperatures near 66°F, and dew points hanging in the mid 60s. The atmosphere should dry out a bit this afternoon as highs climb toward 84°F, but the calm will not last. Showers and thunderstorms are expected to fire back up tonight, and repeated rounds of storms through the Memorial Day weekend could bring localized heavy downpours that throw a wrench into evening plans.
What To Expect Today
For most of Wednesday, May 20, 2026, things stay relatively quiet, with only a slight chance of showers before 7 a.m. Skies should turn partly to mostly sunny, with a high around 84°F and light east-northeast winds near 5 mph. Late afternoon into early evening becomes the main watch period as disturbance energy rolls in from the west and the atmosphere turns more supportive of storms. Isolated severe thunderstorms with damaging wind or hail are possible. For full timing and hourly details see NWS Austin/San Antonio.
Evening And Overnight
Showers and thunderstorms are most likely between about 7 p.m. Wednesday, May 20, 2026, and the pre-dawn hours of Thursday, May 21, 2026, with the highest chances overnight. The forecast bumps the odds to roughly 70% during that window. Heavier cells could quickly drop a quarter to a half inch of rain, along with frequent lightning and gusty winds. Where multiple storms track over the same neighborhoods, ponding and localized flooding are possible.
Weekend Outlook
The active pattern sticks around into the holiday weekend. Saturday, May 23, 2026, carries the highest rain probability at around 80%, with additional chances on Sunday, May 24, 2026, and Memorial Day Monday, May 25, 2026. Highs hold in the low 80s to mid 80s while repeated rounds of rain gradually moisten soils and increase runoff potential. Forecasts note that flood watches could be needed later in the week as the timing of each system becomes clearer.
Commute And Outdoor Tips
If you are heading out Wednesday evening or trying to lock in those long-weekend plans, build in room for sudden downpours and brief travel delays. Secure lightweight outdoor items, steer clear of driving through standing water, and stick with the standard safety mantra: Turn Around, Don’t Drown. You can sign up for local alerts and review preparedness resources at ATX Flood Safety.
