If you're looking to hit the trails today, April 12, 2026, you might want to rethink your plans unless you enjoy dodging raindrops and unexpected detours.
- Weather's a Washout: Heavy thunderstorms and widespread rain are expected throughout the day, with a 70% chance of precipitation, leading to localized flooding and slick surfaces.
- Severe Storm Risk: San Antonio is under a Level 2 out of 5 risk for severe thunderstorms, bringing potential for large hail and damaging winds, particularly in the late afternoon and evening.
- Pollen & AQI are "Meh": Moderate pollen levels combined with "Good" air quality (AQI 33) mean your lungs aren't fighting much, but your joints certainly will be.
Look, the environmental data says the air's mostly fine. AQI is a respectable 33, which is in the "Good" range, and while pollen's moderate, it's not going to cripple most runners. But let's be real, you're not running on air, you're running on the ground, and today, that ground is going to be a soggy mess.
Severe Weather Incoming: Expect heavy rain, thunderstorms, and potential localized flooding. The National Weather Service even had Flash Flood Warnings for counties just west of us earlier this morning, and we're under a Level 2 risk for severe storms, with hail and damaging winds as primary threats. Don't be that person who needs rescuing from a swollen creek. Stay home.
The current temperature of 21.5°C (70°F) is pleasant enough for a run, but with overcast skies and a high likelihood of heavy downpours, you'll be soaked through faster than you can say "Fiesta." The forecast is calling for highs up to 26°C (78°F), so it'll also be humid once the rain lets up, if it does.
If you absolutely must get out, forget about hitting any unpaved trails. "Don't cross trails that are under water" should be common sense, but some of y'all out there still need to hear it. Trails will be muddy, slippery, and strewn with debris.
Trail Closures & Construction: Several popular greenways are impacted. A section of the Salado Creek Greenway from Gembler Road to Houston Street is closed until winter 2026 for maintenance. Plus, a portion connecting to the Tobin Park Trailhead will see intermittent closures due to TXDOT construction. Over on the Leon Creek Greenway, a section under the Loop 1604 overpass north of the Valero Trailhead is periodically closed through April. The trail within Culebra Creek Park is also closed for reconstruction for about three months. Expect diversions or outright impassable sections.
Indoor Options are Your Friend: Today is a prime example of why having an indoor backup plan is crucial. Hit the gym, use that dusty treadmill, or find an indoor track. Your ankles (and emergency responders) will thank you.
Between the torrential rain, the risk of severe storms, and the ongoing construction projects closing significant chunks of our beloved greenway trails, it’s just not worth it. Your outdoor workout can wait. Your personal safety and the integrity of our trails can't.
Data grounded with KSAT.com, KENS5.com, TCEQ.texas.gov, and City of San Antonio from April 11-12, 2026.