Hourly Weather | Today Saturday, May 23, 2026
Active Weather Warnings
San Antonio, Texas
12 PM
Stormy Weather
77°
Feels Like 79°
74
Humidity: 78%
UV Index: 2
Wind: 7 mph
1 PM
Cloudy Weather
81°
Feels Like 90°
49
Humidity: 71%
UV Index: 5
Wind: 8 mph
2 PM
Cloudy Weather
81°
Feels Like 88°
49
Humidity: 74%
UV Index: 4
Wind: 8 mph
3 PM
Cloudy Weather
79°
Feels Like 84°
49
Humidity: 74%
UV Index: 3
Wind: 9 mph
4 PM
Stormy Weather
79°
Feels Like 77°
66
Humidity: 80%
UV Index: 1
Wind: 9 mph
5 PM
Cloudy Weather
77°
Feels Like 81°
49
Humidity: 80%
UV Index: 1
Wind: 9 mph
6 PM
Stormy Weather
75°
Feels Like 75°
56
Humidity: 90%
UV Index: 0
Wind: 8 mph
7 PM
Cloudy Weather
75°
Feels Like 79°
49
Humidity: 82%
UV Index: 0
Wind: 8 mph
8 PM
Sunny with a Chance of Thunderstorms
73°
Feels Like 72°
54
Humidity: 83%
UV Index: 0
Wind: 8 mph
9 PM
Cloudy Night
72°
Feels Like 73°
49
Humidity: 87%
UV Index: 0
Wind: 8 mph
10 PM
Cloudy Night
72°
Feels Like 73°
42
Humidity: 88%
UV Index: 0
Wind: 8 mph
11 PM
Cloudy Night
72°
Feels Like 72°
34
Humidity: 88%
UV Index: 0
Wind: 7 mph

Hourly Air Quality Forecast - AQI (US EPA)

12 PM
21 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 5.02 µg/m³
  • PM10: 6.37 µg/m³
  • O3: 0.018 ppm
  • NO2: 0.4 ppb
  • SO2: 0.1 ppb
  • CO: 0.11 ppm

Health Recommendations:

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

1 PM
21 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 5 µg/m³
  • PM10: 6.21 µg/m³
  • O3: 0.021 ppm
  • NO2: 0.3 ppb
  • SO2: 0.1 ppb
  • CO: 0.11 ppm

Health Recommendations:

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

2 PM
24 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 4.85 µg/m³
  • PM10: 5.96 µg/m³
  • O3: 0.026 ppm
  • NO2: 0.2 ppb
  • SO2: 0.1 ppb
  • CO: 0.11 ppm

Health Recommendations:

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

3 PM
25 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 4.85 µg/m³
  • PM10: 5.97 µg/m³
  • O3: 0.027 ppm
  • NO2: 0.2 ppb
  • SO2: 0.1 ppb
  • CO: 0.11 ppm

Health Recommendations:

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

4 PM
26 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 4.94 µg/m³
  • PM10: 6.16 µg/m³
  • O3: 0.028 ppm
  • NO2: 0.2 ppb
  • SO2: 0.1 ppb
  • CO: 0.11 ppm

Health Recommendations:

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

5 PM
27 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 5.04 µg/m³
  • PM10: 6.27 µg/m³
  • O3: 0.029 ppm
  • NO2: 0.3 ppb
  • SO2: 0.1 ppb
  • CO: 0.12 ppm

Health Recommendations:

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

6 PM
26 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 4.94 µg/m³
  • PM10: 6.01 µg/m³
  • O3: 0.028 ppm
  • NO2: 0.4 ppb
  • SO2: 0.2 ppb
  • CO: 0.12 ppm

Health Recommendations:

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

7 PM
25 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 4.62 µg/m³
  • PM10: 5.41 µg/m³
  • O3: 0.027 ppm
  • NO2: 0.5 ppb
  • SO2: 0.2 ppb
  • CO: 0.12 ppm

Health Recommendations:

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

8 PM
22 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 4.01 µg/m³
  • PM10: 4.51 µg/m³
  • O3: 0.024 ppm
  • NO2: 0.6 ppb
  • SO2: 0.2 ppb
  • CO: 0.11 ppm

Health Recommendations:

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

9 PM
20 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 3.59 µg/m³
  • PM10: 3.94 µg/m³
  • O3: 0.022 ppm
  • NO2: 0.6 ppb
  • SO2: 0.2 ppb
  • CO: 0.11 ppm

Health Recommendations:

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

10 PM
19 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 3.29 µg/m³
  • PM10: 3.57 µg/m³
  • O3: 0.020 ppm
  • NO2: 0.7 ppb
  • SO2: 0.2 ppb
  • CO: 0.11 ppm

Health Recommendations:

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

11 PM
18 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 3.09 µg/m³
  • PM10: 3.37 µg/m³
  • O3: 0.019 ppm
  • NO2: 0.7 ppb
  • SO2: 0.1 ppb
  • CO: 0.11 ppm

Health Recommendations:

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

Weather Alerts and Warnings for San Antonio

Severe Future Possible

Flood Watch

Flood Watch issued May 23 at 1:17AM CDT until May 25 at 7:00PM CDT by NWS Austin/San Antonio TX
May 23, 1:17 AM May 25, 7:00 PM
WHAT: Flooding caused by excessive rainfall continues to be
possible.

WHERE: A portion of south central Texas, including the following
counties, Atascosa, Bandera, Bastrop, Bexar, Blanco, Burnet,
Caldwell, Comal, De Witt, Fayette, Frio, Gillespie, Gonzales,
Guadalupe, Hays, Karnes, Kendall, Kerr, Lavaca, Lee, Llano,
Medina, Travis, Williamson and Wilson.

WHEN: Through Monday evening.

IMPACTS: There is a potential for life threatening flooding
somewhere in the watch area. Excessive runoff may result in
flooding of rivers, creeks, streams, and other low-lying and
flood-prone locations. Creeks and streams may rise out of their
banks. Low-water crossings may be flooded.

ADDITIONAL DETAILS:
- Showers and thunderstorms will be capable of producing high
rainfall rates which could quickly lead to flooding across
the area. Many locations in the watch area have already
received 1 to 3 inches over the past 5 days with a few areas
having received over 5 inches. Additional rounds of heavy
downpours could create rapid rises in creeks, streams, and
rivers. Rainfall amounts of 1 to 3 inches with isolated
amounts up to 6 inches are possible for the duration of the
Flood Watch.
- http://www.weather.gov/safety/flood
+ Read More
You should monitor later forecasts and be alert for possible Flood Warnings. Those living in areas prone to flooding should be prepared to take action should flooding develop.
Updated: May 23, 10:52 AM Source: NWS Alert
Minor Expected Likely

Flood Advisory

Flood Advisory issued May 23 at 9:28AM CDT until May 23 at 12:30PM CDT by NWS Austin/San Antonio TX
May 23, 9:28 AM May 23, 12:30 PM
WHAT: Flooding caused by excessive rainfall is expected.

WHERE: A portion of south central Texas, including the following
county, Bexar.

WHEN: Until 1230 PM CDT.

IMPACTS: Minor flooding in low-lying and poor drainage areas.
Some low-water crossings may become impassable.

ADDITIONAL DETAILS:
- At 928 AM CDT, Doppler radar and automated rain gauges
indicated heavy rain due to thunderstorms. Minor flooding is
ongoing or expected to begin shortly in the advisory area.
Between 1 and 1.5 inches of rain have fallen.
- Additional rainfall amounts up to 1 inch are expected over
the area. This additional rain will result in minor flooding.
- Some locations that will experience flooding include...
San Antonio, Stinson Municipal Airport, Leon Valley, Kirby,
Alamo Heights, Windcrest, Terrell Hills, Olmos Park, China
Grove, Castle Hills, Balcones Heights and Brooks City Base.
- http://www.weather.gov/safety/flood
+ Read More
Turn around, don't drown when encountering flooded roads. Most flood deaths occur in vehicles. Be aware of your surroundings and do not drive on flooded roads.
Updated: May 23, 10:52 AM Source: NWS Alert