San Antonio Temperatures Drop Safely Below 100 Degrees as Fall Begins
As far as those higher values, that’s probably in the rearview mirror by now, National Weather Service meteorologist Harrison Tran told Axios regarding San Antonio’s transition away from extreme summer heat. San Antonio residents are experiencing a welcome reprieve from punishing temperatures as the city moves deeper into October, with forecasts indicating that daily highs will remain safely below the 100-degree mark.
The autumn shift brings a distinct change from the intense heat waves that dominated the region earlier in the year. San Antonio logged 24 triple-digit days this year, with the heat cycle beginning on July 22. The most recent day to reach or exceed 100 degrees occurred on Sept. 15, according to National Weather Service tracking.
San Antonio Records Unusually Hot October Temperatures
While the worst of the summer heat has subsided, warm afternoons remain common during South Central Texas autumns. Tran notes that San Antonio has averaged about seven days at or above 90 degrees in October over recent years. Last October brought an unusually prolonged hot stretch, recording 21 days where temperatures climbed above 90 degrees.
Alongside moderate afternoon temperatures, early October has delivered a noticeable break from heavy humidity. Atmospheric moisture levels are currently hovering right around or slightly below seasonal averages, creating drier conditions than what is typically observed for early October.
El Niño Weather Patterns and Moisture Forecast
Weather conditions are expected to shift in the coming days as atmospheric moisture increases early next week. This change could bring wetter and more variable weather to the area, though forecasters will gain a clearer picture of exact precipitation amounts as the week progresses.
Looking at the broader seasonal outlook, the developing El Niño pattern could deliver a cooler and wetter stretch for San Antonio as fall transitions into winter. This climatic driver typically brings cooler-than-normal temperatures and above-normal precipitation to South Central Texas, according to Tran.
Frequently Asked Questions About San Antonio’s Fall Weather
How many 100-degree days did San Antonio record this year?
San Antonio logged a total of 24 triple-digit days this year, with the first occurring on July 22.
When was the last time San Antonio reached 100 degrees?
The city’s most recent 100-degree day was recorded on Sept. 15.
What are typical October temperatures in the city?
In recent years, San Antonio has averaged about seven days at or above 90 degrees during the month of October.
Related reading