Hourly Weather | Today Friday, June 26, 2026
Active Weather Warnings
St. Louis, Missouri
1 AM
Cloudy Weather
70°
Feels Like 72°
47
Humidity: 94%
UV Index: 0
Wind: 6 mph
2 AM
Cloudy Weather
70°
Feels Like 70°
20
Humidity: 94%
UV Index: 0
Wind: 6 mph
3 AM
Cloudy Weather
70°
Feels Like 70°
20
Humidity: 93%
UV Index: 0
Wind: 6 mph
4 AM
Cloudy Weather
70°
Feels Like 70°
20
Humidity: 92%
UV Index: 0
Wind: 6 mph
5 AM
Cloudy Weather
70°
Feels Like 70°
20
Humidity: 92%
UV Index: 0
Wind: 6 mph
6 AM
Cloudy Weather
70°
Feels Like 70°
20
Humidity: 91%
UV Index: 0
Wind: 6 mph
7 AM
Cloudy Weather
70°
Feels Like 70°
18
Humidity: 93%
UV Index: 0
Wind: 6 mph
8 AM
Cloudy Weather
70°
Feels Like 72°
15
Humidity: 89%
UV Index: 1
Wind: 6 mph
9 AM
Cloudy Weather
72°
Feels Like 73°
15
Humidity: 87%
UV Index: 1
Wind: 6 mph
10 AM
Cloudy Weather
73°
Feels Like 77°
19
Humidity: 85%
UV Index: 1
Wind: 6 mph
11 AM
Cloudy Weather
75°
Feels Like 81°
47
Humidity: 82%
UV Index: 2
Wind: 6 mph
12 PM
Stormy Weather
77°
Feels Like 81°
51
Humidity: 79%
UV Index: 2
Wind: 6 mph
1 PM
Cloudy Weather
79°
Feels Like 86°
47
Humidity: 76%
UV Index: 3
Wind: 6 mph
2 PM
Cloudy Weather
81°
Feels Like 90°
34
Humidity: 75%
UV Index: 5
Wind: 7 mph
3 PM
Cloudy Weather
81°
Feels Like 91°
34
Humidity: 75%
UV Index: 5
Wind: 7 mph
4 PM
Cloudy Weather
81°
Feels Like 90°
40
Humidity: 75%
UV Index: 3
Wind: 7 mph
5 PM
Sunny with a Chance of Thunderstorms
81°
Feels Like 84°
51
Humidity: 79%
UV Index: 1
Wind: 7 mph
6 PM
Cloudy Weather
81°
Feels Like 88°
47
Humidity: 78%
UV Index: 1
Wind: 7 mph
7 PM
Cloudy Weather
81°
Feels Like 88°
43
Humidity: 80%
UV Index: 1
Wind: 7 mph
8 PM
Cloudy Weather
79°
Feels Like 84°
47
Humidity: 81%
UV Index: 0
Wind: 7 mph
9 PM
Stormy Weather
77°
Feels Like 79°
51
Humidity: 85%
UV Index: 0
Wind: 6 mph
10 PM
Cloudy Night
75°
Feels Like 81°
47
Humidity: 88%
UV Index: 0
Wind: 6 mph
11 PM
Cloudy Night
75°
Feels Like 81°
34
Humidity: 90%
UV Index: 0
Wind: 6 mph

Hourly Air Quality Forecast - AQI (US EPA)

1 AM
16 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 3.82 µg/m³
  • PM10: 3.97 µg/m³
  • O3: 0.015 ppm
  • NO2: 0.8 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 AM
18 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 4.4 µg/m³
  • PM10: 4.53 µg/m³
  • O3: 0.017 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.

3 AM
20 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 4.87 µg/m³
  • PM10: 4.98 µg/m³
  • O3: 0.018 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.

4 AM
21 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 5.09 µg/m³
  • PM10: 5.2 µg/m³
  • O3: 0.018 ppm
  • NO2: 0.6 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 AM
20 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 4.76 µg/m³
  • PM10: 4.87 µg/m³
  • O3: 0.019 ppm
  • NO2: 0.6 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 AM
17 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 3.93 µg/m³
  • PM10: 4.05 µg/m³
  • O3: 0.019 ppm
  • NO2: 0.6 ppb
  • SO2: 0.1 ppb
  • CO: 0.12 ppm

Health Recommendations:

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

7 AM
17 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 3.35 µg/m³
  • PM10: 3.49 µg/m³
  • O3: 0.018 ppm
  • NO2: 0.6 ppb
  • SO2: 0.1 ppb
  • CO: 0.12 ppm

Health Recommendations:

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

8 AM
18 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 2.95 µg/m³
  • PM10: 3.17 µg/m³
  • O3: 0.020 ppm
  • NO2: 0.7 ppb
  • SO2: 0.1 ppb
  • CO: 0.12 ppm

Health Recommendations:

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

9 AM
19 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 3 µg/m³
  • PM10: 3.33 µg/m³
  • O3: 0.021 ppm
  • NO2: 0.8 ppb
  • SO2: 0.1 ppb
  • CO: 0.11 ppm

Health Recommendations:

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

10 AM
20 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 3.18 µg/m³
  • PM10: 3.6 µg/m³
  • O3: 0.022 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 AM
22 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 3.58 µg/m³
  • PM10: 4.08 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.

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

Pollutant Concentrations:

  • PM2.5: 3.8 µg/m³
  • PM10: 4.33 µg/m³
  • O3: 0.027 ppm
  • NO2: 0.4 ppb
  • SO2: 0.2 ppb
  • CO: 0.10 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 3.72 µg/m³
  • PM10: 4.24 µg/m³
  • O3: 0.029 ppm
  • NO2: 0.3 ppb
  • SO2: 0.2 ppb
  • CO: 0.10 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 3.38 µg/m³
  • PM10: 3.88 µg/m³
  • O3: 0.030 ppm
  • NO2: 0.3 ppb
  • SO2: 0.2 ppb
  • CO: 0.10 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 3.08 µg/m³
  • PM10: 3.53 µg/m³
  • O3: 0.029 ppm
  • NO2: 0.3 ppb
  • SO2: 0.1 ppb
  • CO: 0.09 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: 2.84 µg/m³
  • PM10: 3.25 µg/m³
  • O3: 0.028 ppm
  • NO2: 0.3 ppb
  • SO2: 0.1 ppb
  • CO: 0.09 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 2.56 µg/m³
  • PM10: 2.91 µg/m³
  • O3: 0.026 ppm
  • NO2: 0.4 ppb
  • SO2: 0.1 ppb
  • CO: 0.09 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 2.5 µg/m³
  • PM10: 2.83 µg/m³
  • O3: 0.024 ppm
  • NO2: 0.5 ppb
  • SO2: 0.1 ppb
  • CO: 0.09 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 2.61 µg/m³
  • PM10: 2.98 µg/m³
  • O3: 0.023 ppm
  • NO2: 0.6 ppb
  • SO2: 0.1 ppb
  • CO: 0.09 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 2.74 µg/m³
  • PM10: 3.12 µg/m³
  • O3: 0.022 ppm
  • NO2: 0.5 ppb
  • SO2: 0.1 ppb
  • CO: 0.09 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: 2.86 µg/m³
  • PM10: 3.2 µg/m³
  • O3: 0.022 ppm
  • NO2: 0.5 ppb
  • SO2: 0.1 ppb
  • CO: 0.09 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 2.81 µg/m³
  • PM10: 3.08 µg/m³
  • O3: 0.021 ppm
  • NO2: 0.5 ppb
  • SO2: 0.1 ppb
  • CO: 0.09 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 2.61 µg/m³
  • PM10: 2.81 µg/m³
  • O3: 0.021 ppm
  • NO2: 0.5 ppb
  • SO2: 0.1 ppb
  • CO: 0.09 ppm

Health Recommendations:

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

Weather Alerts and Warnings for St. Louis

Severe Future Possible

Flood Watch

Flood Watch issued June 25 at 2:55PM CDT until June 26 at 7:00PM CDT by NWS St Louis MO
Jun 25, 2:55 PM Jun 26, 7:00 PM
WHAT: Flash flooding caused by excessive rainfall continues to be
possible.

WHERE: Portions of Illinois, including the following areas, Bond
IL, Calhoun IL, Clinton IL, Fayette IL, Greene IL, Jersey IL,
Macoupin IL, Madison IL, Marion IL, Monroe IL, Montgomery IL, Pike
IL, Randolph IL, Saint Clair IL and Washington IL and Missouri,
including the following areas, Audrain MO, Boone MO, Callaway MO,
Cole MO, Crawford MO, Franklin MO, Gasconade MO, Iron MO, Jefferson
MO, Lincoln MO, Madison MO, Moniteau MO, Montgomery MO, Osage MO,
Pike MO, Reynolds MO, Saint Charles MO, Saint Francois MO, Saint
Louis City MO, Saint Louis MO, Sainte Genevieve MO, Warren MO and
Washington MO.

WHEN: Through Friday evening.

IMPACTS: Excessive runoff may result in flooding of rivers,
creeks, streams, and other low-lying and flood-prone locations.

ADDITIONAL DETAILS:
- Multiple waves of thunderstorms capable of heavy rainfall.
- Some locations that may experience flooding include...
St. Louis, Columbia, O'Fallon, St. Charles, St. Peters,
Florissant, Chesterfield, Belleville, Jefferson City, Wildwood,
University City, Ballwin, Granite City, Wentzville, Alton,
Kirkwood, Maryland Heights, East St. Louis and Hazelwood.
+ Read More
You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued.
Updated: Jun 25, 10:59 PM Source: NWS Alert