Hail and Humidity: San Antonio Braces for Unstable Skies This Friday

A Warm and Humid Start

San Antonio residents are waking up to a thick blanket of clouds and unseasonably warm conditions this Friday, March 6, 2026. With humidity levels hovering around 90% in the early hours, the air feels significantly heavier than usual for early March. Local forecasters are tracking a complex weather pattern that combines high moisture with an approaching atmospheric disturbance, setting the stage for a potentially active weather day across the Alamo City.

Today's Forecast Breakdown

While the day may start with simple cloud cover, the environment is expected to become increasingly unstable as temperatures climb. Here is the timing for today’s weather transitions:

• Morning: Expect mostly cloudy skies with scattered light showers. Temperatures will start in the low 70s, making for a muggy commute.
• Afternoon: The mercury is expected to hit a high of approximately 85°F. While the sun may peek through the clouds occasionally, this heating will increase the chance of scattered thunderstorms developing after 2:00 PM.
• Evening and Night: Isolated storms are predicted to push through the region. While rain chances are currently capped at around 30% for the day, any storm that does form has the potential to become strong. Overnight lows will remain mild, settling near 71°F.

Severe Weather Alerts and Warnings

The National Weather Service has placed San Antonio and the surrounding I-35 corridor under a Level 1 "Marginal Risk" for severe weather today. Although confidence in widespread storm development remains low, meteorologists warn that the storms that do materialize could pack a punch. The primary threats for Friday afternoon and evening include:

• Large Hail: Isolated storms could produce hail of one inch in diameter or larger, which is sufficient to damage vehicles and sensitive plants.
• Damaging Winds: Wind gusts exceeding 60 mph are possible in the vicinity of the strongest storm cells.
• Frequent Lightning: Residents are advised to move indoors immediately if thunder is heard.

Looking Ahead to the Weekend

Today serves as a localized prelude to a more significant weather event expected on Saturday. While Friday's risks are isolated, a more potent cold front is scheduled to arrive tomorrow, bringing a higher likelihood of heavy rainfall and a Level 2 risk of severe thunderstorms. For today, the best advice for San Antonians is to keep an eye on the sky and ensure mobile weather alerts are turned on, particularly during the late afternoon and evening hours.