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Hourly Weather | Today › Tuesday, July 21, 2026
Active Weather Warnings
St. Clair Shores, Michigan
10 AM
Cloudy Weather
75°
Feels Like 79°
47
Humidity: 81%
UV Index: 1
Wind: 14 mph
11 AM
Cloudy Weather
77°
Feels Like 81°
47
Humidity: 80%
UV Index: 3
Wind: 14 mph
12 PM
Cloudy Weather
79°
Feels Like 82°
49
Humidity: 74%
UV Index: 4
Wind: 14 mph
1 PM
Stormy Weather
77°
Feels Like 79°
55
Humidity: 83%
UV Index: 3
Wind: 15 mph
2 PM
Stormy Weather
81°
Feels Like 82°
63
Humidity: 80%
UV Index: 3
Wind: 15 mph
3 PM
Cloudy Weather
79°
Feels Like 84°
49
Humidity: 79%
UV Index: 4
Wind: 15 mph
4 PM
Cloudy Weather
81°
Feels Like 82°
49
Humidity: 70%
UV Index: 3
Wind: 14 mph
5 PM
Cloudy Weather
79°
Feels Like 79°
49
Humidity: 66%
UV Index: 2
Wind: 14 mph
6 PM
Cloudy Weather
79°
Feels Like 79°
49
Humidity: 65%
UV Index: 1
Wind: 14 mph
7 PM
Stormy Weather
73°
Feels Like 70°
66
Humidity: 87%
UV Index: 0
Wind: 13 mph
8 PM
Cloudy Weather
73°
Feels Like 73°
25
Humidity: 83%
UV Index: 0
Wind: 13 mph
9 PM
Cloudy Weather
72°
Feels Like 70°
20
Humidity: 79%
UV Index: 0
Wind: 13 mph
10 PM
Cloudy Night
72°
Feels Like 66°
20
Humidity: 70%
UV Index: 0
Wind: 14 mph
11 PM
Cloudy Night
68°
Feels Like 64°
20
Humidity: 71%
UV Index: 0
Wind: 14 mph

Hourly Air Quality Forecast - AQI (US EPA)

10 AM
46 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 11.07 µg/m³
  • PM10: 11.2 µg/m³
  • O3: 0.041 ppm
  • NO2: 1.7 ppb
  • SO2: 0.2 ppb
  • CO: 0.23 ppm

Health Recommendations:

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

11 AM
40 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 9.7 µg/m³
  • PM10: 9.82 µg/m³
  • O3: 0.039 ppm
  • NO2: 1.7 ppb
  • SO2: 0.2 ppb
  • CO: 0.22 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 9.01 µg/m³
  • PM10: 9.15 µg/m³
  • O3: 0.037 ppm
  • NO2: 1.5 ppb
  • SO2: 0.2 ppb
  • CO: 0.21 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 9.03 µg/m³
  • PM10: 9.19 µg/m³
  • O3: 0.036 ppm
  • NO2: 1.3 ppb
  • SO2: 0.2 ppb
  • CO: 0.21 ppm

Health Recommendations:

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

2 PM
40 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 9.48 µg/m³
  • PM10: 9.64 µg/m³
  • O3: 0.037 ppm
  • NO2: 1.1 ppb
  • SO2: 0.2 ppb
  • CO: 0.20 ppm

Health Recommendations:

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

3 PM
40 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 9.66 µg/m³
  • PM10: 9.81 µg/m³
  • O3: 0.040 ppm
  • NO2: 0.9 ppb
  • SO2: 0.2 ppb
  • CO: 0.19 ppm

Health Recommendations:

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

4 PM
42 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 10.1 µg/m³
  • PM10: 10.26 µg/m³
  • O3: 0.043 ppm
  • NO2: 0.8 ppb
  • SO2: 0.3 ppb
  • CO: 0.17 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 9.86 µg/m³
  • PM10: 10.03 µg/m³
  • O3: 0.045 ppm
  • NO2: 0.9 ppb
  • SO2: 0.3 ppb
  • CO: 0.16 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 8.61 µg/m³
  • PM10: 8.78 µg/m³
  • O3: 0.046 ppm
  • NO2: 1 ppb
  • SO2: 0.3 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 6.84 µg/m³
  • PM10: 7.01 µg/m³
  • O3: 0.045 ppm
  • NO2: 1.1 ppb
  • SO2: 0.3 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 5.15 µg/m³
  • PM10: 5.32 µg/m³
  • O3: 0.043 ppm
  • NO2: 1.2 ppb
  • SO2: 0.3 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 3.7 µg/m³
  • PM10: 3.87 µg/m³
  • O3: 0.039 ppm
  • NO2: 1.4 ppb
  • SO2: 0.4 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 2.63 µg/m³
  • PM10: 2.8 µg/m³
  • O3: 0.035 ppm
  • NO2: 1.5 ppb
  • SO2: 0.4 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 1.79 µg/m³
  • PM10: 1.96 µg/m³
  • O3: 0.028 ppm
  • NO2: 1.7 ppb
  • SO2: 0.5 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

Current Real-Time Air Quality Report

Weather Alerts and Warnings for St. Clair Shores

Minor Expected Observed

Marine Weather Statement

Marine Weather Statement issued July 21 at 9:01AM EDT by NWS Detroit/Pontiac MI
Jul 21, 9:01 AM → Jul 21, 9:30 AM
A Marine Weather Statement has been issued for the following areas...
Detroit River...
Lake St. Clair Open Lake (U.S. Portion)...

At 900 AM EDT, Doppler radar indicated developing thunderstorms,
capable of producing winds up to 30 knots. This thunderstorm was
located over St. Clair Shores, moving east at 55 knots.

The strong thunderstorm will be near...
St. Clair Shores around 905 AM EDT.
St Clair Flats Old Channel Light around 910 AM EDT.
+ Read More
Mariners can expect gusty winds up to 30 knots, locally higher waves, lightning strikes, and heavy downpours. Boaters should seek safe harbor immediately until this storm passes.
Updated: Jul 21, 9:18 AM Source: NWS Alert

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