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Hourly Weather | Today › Tuesday, July 21, 2026
Active Weather Warnings
Fort Smith, Arkansas
9 AM
Sunny Weather
88°
Feels Like 102°
0
Humidity: 70%
UV Index: 3
Wind: 5 mph
10 AM
Sunny Weather
91°
Feels Like 106°
0
Humidity: 59%
UV Index: 5
Wind: 6 mph
11 AM
Sunny Weather
95°
Feels Like 109°
0
Humidity: 52%
UV Index: 8
Wind: 6 mph
12 PM
Sunny Weather
99°
Feels Like 115°
0
Humidity: 47%
UV Index: 10
Wind: 7 mph
1 PM
Cloudy Weather
100°
Feels Like 115°
0
Humidity: 42%
UV Index: 11
Wind: 7 mph
2 PM
Cloudy Weather
102°
Feels Like 115°
0
Humidity: 39%
UV Index: 10
Wind: 7 mph
3 PM
Cloudy Weather
102°
Feels Like 115°
0
Humidity: 37%
UV Index: 8
Wind: 7 mph
4 PM
Cloudy Weather
104°
Feels Like 113°
0
Humidity: 35%
UV Index: 5
Wind: 7 mph
5 PM
Cloudy Weather
102°
Feels Like 111°
0
Humidity: 36%
UV Index: 3
Wind: 7 mph
6 PM
Cloudy Weather
102°
Feels Like 109°
0
Humidity: 38%
UV Index: 2
Wind: 7 mph
7 PM
Cloudy Weather
100°
Feels Like 108°
0
Humidity: 40%
UV Index: 1
Wind: 7 mph
8 PM
Cloudy Weather
99°
Feels Like 104°
0
Humidity: 45%
UV Index: 0
Wind: 7 mph
9 PM
Cloudy Night
95°
Feels Like 102°
0
Humidity: 50%
UV Index: 0
Wind: 6 mph
10 PM
Cloudy Night
93°
Feels Like 100°
0
Humidity: 55%
UV Index: 0
Wind: 5 mph
11 PM
Cloudy Night
90°
Feels Like 99°
0
Humidity: 58%
UV Index: 0
Wind: 5 mph

Hourly Air Quality Forecast - AQI (US EPA)

9 AM
13 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 3.19 µg/m³
  • PM10: 5.63 µg/m³
  • O3: 0.011 ppm
  • NO2: 1.3 ppb
  • SO2: 0.1 ppb
  • CO: 0.09 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 3.24 µg/m³
  • PM10: 5.81 µg/m³
  • O3: 0.018 ppm
  • NO2: 1.1 ppb
  • SO2: 0.2 ppb
  • CO: 0.09 ppm

Health Recommendations:

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

11 AM
33 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 4.09 µg/m³
  • PM10: 7.28 µg/m³
  • O3: 0.036 ppm
  • NO2: 0.6 ppb
  • SO2: 0.4 ppb
  • CO: 0.09 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 4.93 µg/m³
  • PM10: 8.2 µg/m³
  • O3: 0.040 ppm
  • NO2: 0.5 ppb
  • SO2: 0.4 ppb
  • CO: 0.09 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: O3
Details

Pollutant Concentrations:

  • PM2.5: 5.51 µg/m³
  • PM10: 8.69 µg/m³
  • O3: 0.041 ppm
  • NO2: 0.4 ppb
  • SO2: 0.3 ppb
  • CO: 0.08 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 4.69 µg/m³
  • PM10: 7.33 µg/m³
  • O3: 0.040 ppm
  • NO2: 0.3 ppb
  • SO2: 0.2 ppb
  • CO: 0.08 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 3.91 µg/m³
  • PM10: 6.04 µg/m³
  • O3: 0.038 ppm
  • NO2: 0.2 ppb
  • SO2: 0.1 ppb
  • CO: 0.08 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 3.6 µg/m³
  • PM10: 5.46 µg/m³
  • O3: 0.037 ppm
  • NO2: 0.2 ppb
  • SO2: 0.1 ppb
  • CO: 0.08 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 3.5 µg/m³
  • PM10: 5.26 µg/m³
  • O3: 0.036 ppm
  • NO2: 0.3 ppb
  • SO2: 0.1 ppb
  • CO: 0.08 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 3.5 µg/m³
  • PM10: 5.29 µg/m³
  • O3: 0.034 ppm
  • NO2: 0.4 ppb
  • SO2: 0.1 ppb
  • CO: 0.08 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 3.53 µg/m³
  • PM10: 5.37 µg/m³
  • O3: 0.033 ppm
  • NO2: 0.6 ppb
  • SO2: 0.1 ppb
  • CO: 0.08 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 3.58 µg/m³
  • PM10: 5.57 µg/m³
  • O3: 0.029 ppm
  • NO2: 1 ppb
  • SO2: 0.2 ppb
  • CO: 0.09 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 3.68 µg/m³
  • PM10: 5.91 µg/m³
  • O3: 0.025 ppm
  • NO2: 1.5 ppb
  • SO2: 0.2 ppb
  • CO: 0.09 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 3.81 µg/m³
  • PM10: 6.25 µg/m³
  • O3: 0.024 ppm
  • NO2: 1.9 ppb
  • SO2: 0.2 ppb
  • CO: 0.10 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 3.89 µg/m³
  • PM10: 6.47 µg/m³
  • O3: 0.022 ppm
  • NO2: 2.2 ppb
  • SO2: 0.2 ppb
  • CO: 0.10 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 Fort Smith

Severe Future Likely

Extreme Heat Watch

Extreme Heat Watch issued July 19 at 10:54PM CDT until July 21 at 8:00PM CDT by NWS Tulsa OK
Jul 21, 12:00 PM → Jul 21, 8:00 PM
WHAT: For the Heat Advisory, heat index values up to 109 expected.
For the Extreme Heat Watch, dangerously hot conditions with heat
index values up to 113 possible.

WHERE: Portions of northwest and west central Arkansas and east
central, northeast, and southeast Oklahoma.

WHEN: For the Heat Advisory, from 1 PM to 8 PM CDT Monday. For the
Extreme Heat Watch, from Tuesday afternoon through Tuesday evening.

IMPACTS: Heat related illnesses increase significantly during
extreme heat and high humidity events. Heat related illnesses are
possible especially impacting those not acclimated to the
conditions or those performing strenuous activities.
+ Read More
Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Take extra precautions when outside. Wear lightweight and loose fitting clothing. Try to limit strenuous activities to early morning or evening. Take action when you see symptoms of heat exhaustion and heat stroke.
Updated: Jul 20, 11:42 AM Source: NWS Alert
Severe Expected Likely

Extreme Heat Warning

Extreme Heat Warning issued July 20 at 10:52PM CDT until July 21 at 8:00PM CDT by NWS Tulsa OK
Jul 21, 12:00 PM → Jul 21, 8:00 PM
WHAT: Dangerously hot conditions with heat index values from 110
to 115 expected.

WHERE: Portions of northwest and west central Arkansas and east
central, northeast, and southeast Oklahoma.

WHEN: From noon to 8 PM CDT Tuesday.

IMPACTS: Heat related illnesses increase significantly during
extreme heat and high humidity events.
+ 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: Jul 21, 7:17 AM Source: NWS Alert

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