Hourly Weather Forecast for St. Joseph, Missouri

Hourly Weather | Today › Wednesday, August 12, 2026

Active Weather Warnings

Heat Advisory

St. Joseph, Missouri

8 AM

79°

Feels Like 81°

Humidity: 79%

UV Index: 1

Wind: 9 mph

9 AM

79°

Feels Like 86°

Humidity: 81%

UV Index: 3

Wind: 9 mph

10 AM

81°

Feels Like 88°

Humidity: 81%

UV Index: 4

Wind: 9 mph

11 AM

82°

Feels Like 93°

Humidity: 75%

UV Index: 6

Wind: 9 mph

12 PM

84°

Feels Like 97°

Humidity: 71%

UV Index: 8

Wind: 9 mph

1 PM

86°

Feels Like 100°

Humidity: 67%

UV Index: 9

Wind: 9 mph

2 PM

88°

Feels Like 99°

Humidity: 68%

UV Index: 8

Wind: 9 mph

3 PM

90°

Feels Like 102°

Humidity: 61%

UV Index: 6

Wind: 9 mph

4 PM

91°

Feels Like 104°

Humidity: 59%

UV Index: 4

Wind: 9 mph

5 PM

93°

Feels Like 106°

Humidity: 57%

UV Index: 3

Wind: 7 mph

6 PM

91°

Feels Like 104°

Humidity: 62%

UV Index: 2

Wind: 6 mph

7 PM

90°

Feels Like 102°

Humidity: 66%

UV Index: 1

Wind: 6 mph

8 PM

88°

Feels Like 99°

Humidity: 71%

UV Index: 0

Wind: 7 mph

9 PM

84°

Feels Like 91°

Humidity: 83%

UV Index: 0

Wind: 8 mph

10 PM

82°

Feels Like 88°

Humidity: 83%

UV Index: 0

Wind: 9 mph

11 PM

81°

Feels Like 88°

Humidity: 85%

UV Index: 0

Wind: 9 mph

Hourly Air Quality Forecast - AQI (US EPA)

8 AM

27 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 2.37 µg/m³
PM₁₀: 2.82 µg/m³
O₃: 0.029 ppm
NO₂: 1.4 ppb
SO₂: 0.4 ppb
CO: 0.09 ppm

Health Recommendations:

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

9 AM

26 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 2.23 µg/m³
PM₁₀: 2.74 µg/m³
O₃: 0.028 ppm
NO₂: 1.4 ppb
SO₂: 0.4 ppb
CO: 0.09 ppm

Health Recommendations:

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

10 AM

26 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 2.13 µg/m³
PM₁₀: 2.67 µg/m³
O₃: 0.028 ppm
NO₂: 1.2 ppb
SO₂: 0.5 ppb
CO: 0.09 ppm

Health Recommendations:

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

11 AM

29 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 2.16 µg/m³
PM₁₀: 2.74 µg/m³
O₃: 0.031 ppm
NO₂: 0.8 ppb
SO₂: 0.5 ppb
CO: 0.09 ppm

Health Recommendations:

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

12 PM

32 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 2.57 µg/m³
PM₁₀: 3.21 µg/m³
O₃: 0.035 ppm
NO₂: 0.6 ppb
SO₂: 0.5 ppb
CO: 0.09 ppm

Health Recommendations:

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

1 PM

34 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 3.07 µg/m³
PM₁₀: 3.77 µg/m³
O₃: 0.037 ppm
NO₂: 0.5 ppb
SO₂: 0.6 ppb
CO: 0.08 ppm

Health Recommendations:

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

2 PM

36 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 3.17 µg/m³
PM₁₀: 3.95 µg/m³
O₃: 0.039 ppm
NO₂: 0.4 ppb
SO₂: 0.5 ppb
CO: 0.08 ppm

Health Recommendations:

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

3 PM

37 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 3.08 µg/m³
PM₁₀: 3.89 µg/m³
O₃: 0.040 ppm
NO₂: 0.4 ppb
SO₂: 0.5 ppb
CO: 0.08 ppm

Health Recommendations:

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

4 PM

37 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 2.85 µg/m³
PM₁₀: 3.65 µg/m³
O₃: 0.040 ppm
NO₂: 0.3 ppb
SO₂: 0.4 ppb
CO: 0.08 ppm

Health Recommendations:

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

5 PM

36 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 2.56 µg/m³
PM₁₀: 3.31 µg/m³
O₃: 0.039 ppm
NO₂: 0.4 ppb
SO₂: 0.4 ppb
CO: 0.08 ppm

Health Recommendations:

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

6 PM

34 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 2.33 µg/m³
PM₁₀: 3.03 µg/m³
O₃: 0.037 ppm
NO₂: 0.6 ppb
SO₂: 0.3 ppb
CO: 0.08 ppm

Health Recommendations:

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

7 PM

32 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 2.11 µg/m³
PM₁₀: 2.78 µg/m³
O₃: 0.035 ppm
NO₂: 0.8 ppb
SO₂: 0.3 ppb
CO: 0.08 ppm

Health Recommendations:

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

8 PM

31 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 1.89 µg/m³
PM₁₀: 2.55 µg/m³
O₃: 0.033 ppm
NO₂: 0.9 ppb
SO₂: 0.3 ppb
CO: 0.08 ppm

Health Recommendations:

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

9 PM

30 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 1.73 µg/m³
PM₁₀: 2.38 µg/m³
O₃: 0.032 ppm
NO₂: 0.9 ppb
SO₂: 0.2 ppb
CO: 0.08 ppm

Health Recommendations:

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

10 PM

30 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 1.61 µg/m³
PM₁₀: 2.23 µg/m³
O₃: 0.032 ppm
NO₂: 0.9 ppb
SO₂: 0.3 ppb
CO: 0.08 ppm

Health Recommendations:

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

11 PM

30 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 1.46 µg/m³
PM₁₀: 2.03 µg/m³
O₃: 0.032 ppm
NO₂: 1 ppb
SO₂: 0.3 ppb
CO: 0.08 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. Joseph

Moderate Expected Likely

Heat Advisory

Heat Advisory issued August 12 at 3:27AM CDT until August 13 at 8:00PM CDT by NWS Kansas City/Pleasant Hill MO

Aug 12, 3:27 AM → Aug 13, 8:00 PM

WHAT: Heat index values up to 107.

WHERE: Portions of northeast Kansas and north central, northeast,
and northwest Missouri.

WHEN: Until 8 PM CDT Thursday.

IMPACTS: Hot temperatures and high humidity may cause heat
illnesses.

+ Read More

Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors.

Updated: Aug 12, 7:28 AM Source: NWS Alert

Hourly Air Quality Forecast - AQI (US EPA)

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Weather Alerts and Warnings for St. Joseph

Heat Advisory

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