Houston Weather Alert: Severe Thunderstorms & Flash Flood Warnings—What You Need to Know Today

Houston weather will crank up the heat and the hype this Memorial Day as temperatures soar into the mid-90s, the heat index flirts with 100 °F and a fresh round of storms targets the city this afternoon and tonight. The steamy setup—prime fuel for severe thunderstorms—puts the entire metro under the microscope for damaging wind gusts, intense lightning, localized flash flooding and spotty power outages just in time for peak holiday traffic. Forecasters with the National Weather Service in Houston say isolated showers could pop as early as noon, but the main severe-weather window opens between 3 p.m. and midnight, especially along and north of I-10. A Fox 26 Storm Alert is already in place, and a Flood Watch covers portions of Harris, Montgomery and Liberty counties through early Tuesday. One to three inches of rain may fall in less than an hour under the strongest cells; low-lying streets that typically pond during heavy Houston downpours will likely flood again. Beachgoers aren’t immune either: a robust 10–15 mph southeast breeze is driving dangerous rip currents from Surfside to Galveston Island. Galveston County’s Rip Current Statement remains active until 7 a.m. Tuesday, so swim near lifeguards, avoid jetties and remember that rip currents intensify at low tide. The Houston forecast becomes even wetter Tuesday and Wednesday as a slow-moving upper-level disturbance taps deep Gulf moisture. Scattered storms before sunrise could produce another 1–2 inches of rainfall, followed by a brief midday lull and a second round of evening storms. By Thursday a weak frontal boundary slips south, trimming afternoon highs into the upper-80s but keeping rain chances around 60 percent. 7-Day Houston Weather at a Glance • Monday (Memorial Day): 95 °F / 76 °F – 50 % p.m. storms, severe possible • Tuesday: 88 °F / 75 °F – 70 % storms a.m. & p.m., flash-flood risk • Wednesday: 86 °F / 74 °F – 60 % heavy thunderstorms, isolated street flooding • Thursday: 85 °F / 73 °F – 50 % scattered showers, muggy • Friday: 87 °F / 74 °F – 40 % pop-up storms, hot and humid • Saturday: 83 °F / 74 °F – 30 % afternoon downpour, partly cloudy • Sunday: 83 °F / 74 °F – 20 % stray shower, seasonably warm Severe-Weather Safety Tips for Houston Drivers & Homeowners • Enable Wireless Emergency Alerts and monitor reliable local radar apps. • Never drive across a water-covered roadway; only 6 inches can sweep away a car. • Secure lawn furniture, umbrellas and grills—straight-line winds above 55 mph are possible. • Charge phones and portable batteries now; ERCOT does not expect a grid emergency, but isolated outages are likely. • Bring pets and holiday decorations indoors before storms arrive. Beyond midweek, long-range models hint Houston could dry out briefly next weekend before yet another Gulf disturbance spikes rain chances. Hurricane season officially starts 1 June, and tropical development is not expected this week, but warm Gulf water plus lingering boundaries mean every storm will wring out tropical-style rainfall. Bookmark this page and check back often—we update the Houston weather forecast daily so you stay one step ahead of Texas heat, humidity and those headline-making Houston thunderstorms.