Today | Weather | Wednesday, September 23, 2026

Weather in San Antonio, Texas

02:38 PM
Now
Cloudy Weather
95° F
Feels Like 100°
Precipitation 14 %
Wind 8 mph
UV Index (0 - 11+) 5
Humidity 42 %
Today
Sunny with a Chance of Thunderstorms
Day 95°
Night 75°
Precipitation 55 %
Wind 7 mph
UV Index (0 - 11+) 7

San Antonio Weather Forecast Updated

53 minutes ago
Last updated on
Weather Forecast History
Last Year's Weather on This Day (September 23, 2025)
Cloudy Night

Day

99°

Night

75°

Wind

8 mph

Precipitation

12 %

Air Quality in San Antonio

NOW
41 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 0.96 µg/m³
PM10 1.45 µg/m³
O3 0.044 ppm
NO2 0.2 ppb
SO2 0.1 ppb
CO 0.11 ppm
NH3 0.13 µg/m³
NO 0.03 µg/m³
PM2.5 – Fine particles <2.5μm
PM10 – Inhalable particles <10μm
O3 – Ozone
NO2 – Nitrogen dioxide
SO2 – Sulfur dioxide
CO – Carbon monoxide
NH3 – Ammonia
NO – Nitric oxide

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

Show raw pollutant concentrations (µg/m³)
PM2.50.96 µg/m³
PM101.45 µg/m³
O387.36 µg/m³
NO20.43 µg/m³
SO20.18 µg/m³
CO121.96 µg/m³
NH30.13 µg/m³
NO0.03 µg/m³