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Windy and very dry tomorrow, biggest fire risk of the week

Relative humidity plunges below 10% with gusts of 35 mph

Windy and very dry weather causing extreme fire danger tomorrow (3/19 /25). (Copyright 2024 by KSAT - All rights reserved.)

FORECAST HIGHLIGHTS

  • FIRE DANGER: Extreme fire danger Wednesday, worst of the week
  • COOL MORNINGS: Low to mid 40s Thursday and Friday
  • DRY: Rain chances remain low at 20% Sunday and into next week

FORECAST

It’s been quite a stretch to start the month of March. The main story line has been gusty winds and fire concerns. If we’re looking for a glimmer of hope, the extended forecast appears to bring more humidity to South Texas, easing the fire danger after tomorrow.

HIGH FIRE DANGER WEDNESDAY

A front will move through early on Wednesday. This will cause humidity levels to plummet, as very dry West Texas air pushes into San Antonio. Additionally, northwesterly winds will increase to 10-20 mph, with gusts of up to 35 mph (higher in the Hill Country). The strongest winds will be from sunrise to midday, then subside by the late afternoon into the evening hours. Easily ignited and fast-spreading wildfires are a concern because the gusts will be combined with relative humidity below 10%.

Very low relative humidity Wednesday. (Copyright 2024 by KSAT - All rights reserved.)

SPRING EQUINOX

Astronomical spring officially begins Thursday at 4:01am.

MORE HUMIDITY, SMALL SHOT AT A STORM ON SUNDAY

Humidity will increase this weekend, creating more clouds and a more typical spring weather pattern. As a weak front approaches the area, a stray storm is possible Sunday afternoon into Sunday night. Should a storm form, severe weather would be possible. However, odds of seeing a storm are currently low.

San Antonio's extended forecast as of 3/18/25. (Copyright 2024 by KSAT - All rights reserved.)

QUICK WEATHER LINKS


About the Authors
Justin Horne headshot

Justin Horne is a meteorologist and reporter for KSAT 12 News. When severe weather rolls through, Justin will hop in the KSAT 12 Storm Chaser to safely bring you the latest weather conditions from across South Texas. On top of delivering an accurate forecast, Justin often reports on one of his favorite topics: Texas history.

Adam Caskey headshot

Adam Caskey has been a meteorologist with KSAT's Weather Authority team since April 2014. He previously worked in North Dakota and Washington, D.C., where he earned the "Certified Broadcast Meteorologist" designation by the American Meteorological Association. A native Minnesotan, Adam loves to fish and enjoys the outdoors.

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