Cold Front Friday: Why San Antonio Homeowners Should Keep the Windows Shut
A cold front reaches San Antonio late Thursday into Friday, and I think you should keep your windows shut when it does. A cool weekend after a hot week makes everyone want fresh air in the house.
Ragweed season still runs through mid November, according to Texas Public Radio. Use this hot, muggy week for a quick home reset, then enjoy the cool weather from the porch.
Illustration: San Antonio Maid Services
This matters if anyone in your home has allergies, if you have kids who nap by a window, or if your bedroom faces a yard. The weather turns fast, and pollen does not care that it finally feels like fall.
The KSAT forecast says humidity returned Monday, with highs in the low 90s and a heat index above 100 for a few afternoon hours. Tuesday's heat index could approach 105.
The front will not have much moisture to work with in San Antonio, so KSAT puts rain chances at only about 10%. Expect gusty winds and a noticeable drop in temperature. KSAT's early look at next weekend shows highs in the 70s and lows in the 50s, but that is tentative.
Gusty winds can blow whatever is outside through an open window. Texas Public Radio reported that ragweed season runs from late August through mid November, with a peak in mid September.
The report said ragweed plants were expected to grow tall and dense this season. It pointed to a rainy July followed by a sunny August. Counts change from day to day, so check local pollen reports before you open a window.
Dr. John Freiler, founder of Premier Allergy of Texas, said in the report to limit outdoor time from late morning through the afternoon. He said to change your clothes, shower or rinse off when you come in. He also said to monitor local media for high count days and stay indoors if you can.
So use the hot days while your AC is still running. Change the HVAC filter. Wipe the window sills and window tracks, because dust and pollen collect there.
Wash your bedding, put a mat at each door, take shoes off at the door, and vacuum the floors. Our spring cleaning guide covers pollen, HVAC filters and HEPA in more detail.
If you would rather hand it off, Recurring Cleaning cleans the floors, dusts reachable baseboards and wipes high touch surfaces on every visit.
Humidity matters too. The EPA says to keep indoor humidity below 60% if possible, ideally 30% to 50%.
It suggests running the air conditioner or a dehumidifier when needed, and running the bathroom fan when you shower. It also says to dry water damaged areas and items within 24 to 48 hours.
I know the other side. After a long Texas summer, a breeze through the kitchen feels wonderful, and outdoor air can feel better than the stale air inside. That is fair.
But you cannot see ragweed pollen in the air, and the air can feel great while your sinuses disagree. If your local pollen report looks low, crack a window. Otherwise, run the bathroom fan when you shower and the kitchen exhaust fan when you cook, and let the AC do the work.
Cedar fever season starts around December 15, according to the Allergy & Asthma Network, so this window question is coming back soon. A clean filter, clear sills and a door mat habit will help in both seasons.
Sources: KSAT, Oct. 12, 2026 (forecast); Texas Public Radio, Aug. 21, 2026 (ragweed season and Dr. Freiler's advice); EPA (humidity and moisture); Allergy & Asthma Network (cedar season dates)
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Emeka Ogbonna is the founder of San Antonio Maid Services LLC, a locally owned, residential only house cleaning company in San Antonio, TX 78240. He has more than a decade of professional cleaning experience.