Hourly Weather | Today Tuesday, July 21, 2026
Active Weather Warnings
Richland, Washington
1 AM
Cloudy Night
72°
Feels Like 70°
0
Humidity: 60%
UV Index: 0
Wind: 4 mph
2 AM
Cloudy Night
70°
Feels Like 68°
0
Humidity: 63%
UV Index: 0
Wind: 4 mph
3 AM
Cloudy Night
70°
Feels Like 66°
0
Humidity: 68%
UV Index: 0
Wind: 4 mph
4 AM
Cloudy Night
68°
Feels Like 66°
0
Humidity: 70%
UV Index: 0
Wind: 4 mph
5 AM
Cloudy Night
66°
Feels Like 66°
0
Humidity: 71%
UV Index: 0
Wind: 2 mph
6 AM
Cloudy Weather
70°
Feels Like 68°
0
Humidity: 66%
UV Index: 0
Wind: 2 mph
7 AM
Cloudy Weather
73°
Feels Like 73°
0
Humidity: 57%
UV Index: 1
Wind: 4 mph
8 AM
Cloudy Weather
77°
Feels Like 79°
0
Humidity: 49%
UV Index: 2
Wind: 4 mph
9 AM
Cloudy Weather
82°
Feels Like 86°
0
Humidity: 39%
UV Index: 3
Wind: 4 mph
10 AM
Cloudy Weather
86°
Feels Like 91°
0
Humidity: 32%
UV Index: 4
Wind: 4 mph
11 AM
Cloudy Weather
90°
Feels Like 97°
0
Humidity: 27%
UV Index: 6
Wind: 5 mph
12 PM
Cloudy Weather
93°
Feels Like 100°
0
Humidity: 24%
UV Index: 8
Wind: 5 mph
1 PM
Cloudy Weather
95°
Feels Like 102°
0
Humidity: 21%
UV Index: 9
Wind: 5 mph
2 PM
Cloudy Weather
99°
Feels Like 106°
0
Humidity: 19%
UV Index: 8
Wind: 5 mph
3 PM
Cloudy Weather
99°
Feels Like 104°
0
Humidity: 18%
UV Index: 6
Wind: 5 mph
4 PM
Cloudy Weather
100°
Feels Like 102°
0
Humidity: 17%
UV Index: 4
Wind: 5 mph
5 PM
Cloudy Weather
100°
Feels Like 102°
0
Humidity: 16%
UV Index: 3
Wind: 6 mph
6 PM
Cloudy Weather
100°
Feels Like 100°
0
Humidity: 18%
UV Index: 2
Wind: 6 mph
7 PM
Cloudy Weather
99°
Feels Like 99°
0
Humidity: 19%
UV Index: 1
Wind: 6 mph
8 PM
Cloudy Weather
97°
Feels Like 93°
0
Humidity: 23%
UV Index: 0
Wind: 5 mph
9 PM
Cloudy Night
90°
Feels Like 88°
0
Humidity: 30%
UV Index: 0
Wind: 5 mph
10 PM
Cloudy Night
86°
Feels Like 82°
0
Humidity: 36%
UV Index: 0
Wind: 5 mph
11 PM
Cloudy Night
82°
Feels Like 81°
0
Humidity: 41%
UV Index: 0
Wind: 5 mph

Hourly Air Quality Forecast - AQI (US EPA)

1 AM
345 AQI
Hazardous air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 306.39 µg/m³
  • PM10: 307.22 µg/m³
  • O3: 0.041 ppm
  • NO2: 8.9 ppb
  • SO2: 1.1 ppb
  • CO: 1.07 ppm

Health Recommendations:

Health warnings of emergency conditions. The entire population is more likely to be affected.

2 AM
368 AQI
Hazardous air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 335.3 µg/m³
  • PM10: 336.13 µg/m³
  • O3: 0.039 ppm
  • NO2: 8.1 ppb
  • SO2: 1.1 ppb
  • CO: 1.16 ppm

Health Recommendations:

Health warnings of emergency conditions. The entire population is more likely to be affected.

3 AM
394 AQI
Hazardous air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 367.68 µg/m³
  • PM10: 368.52 µg/m³
  • O3: 0.038 ppm
  • NO2: 7.4 ppb
  • SO2: 1.1 ppb
  • CO: 1.24 ppm

Health Recommendations:

Health warnings of emergency conditions. The entire population is more likely to be affected.

4 AM
424 AQI
Hazardous air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 405.34 µg/m³
  • PM10: 406.21 µg/m³
  • O3: 0.037 ppm
  • NO2: 7.1 ppb
  • SO2: 1.2 ppb
  • CO: 1.34 ppm

Health Recommendations:

Health warnings of emergency conditions. The entire population is more likely to be affected.

5 AM
457 AQI
Hazardous air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 445.75 µg/m³
  • PM10: 446.65 µg/m³
  • O3: 0.036 ppm
  • NO2: 7.1 ppb
  • SO2: 1.2 ppb
  • CO: 1.45 ppm

Health Recommendations:

Health warnings of emergency conditions. The entire population is more likely to be affected.

6 AM
477 AQI
Hazardous air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 471.4 µg/m³
  • PM10: 472.34 µg/m³
  • O3: 0.034 ppm
  • NO2: 7 ppb
  • SO2: 1.2 ppb
  • CO: 1.52 ppm

Health Recommendations:

Health warnings of emergency conditions. The entire population is more likely to be affected.

7 AM
489 AQI
Hazardous air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 486.11 µg/m³
  • PM10: 487.13 µg/m³
  • O3: 0.032 ppm
  • NO2: 6.9 ppb
  • SO2: 1.1 ppb
  • CO: 1.55 ppm

Health Recommendations:

Health warnings of emergency conditions. The entire population is more likely to be affected.

8 AM
499 AQI
Hazardous air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 499.01 µg/m³
  • PM10: 500.15 µg/m³
  • O3: 0.035 ppm
  • NO2: 7.1 ppb
  • SO2: 1 ppb
  • CO: 1.59 ppm

Health Recommendations:

Health warnings of emergency conditions. The entire population is more likely to be affected.

9 AM
449 AQI
Hazardous air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 436.77 µg/m³
  • PM10: 438.15 µg/m³
  • O3: 0.058 ppm
  • NO2: 9.4 ppb
  • SO2: 1.4 ppb
  • CO: 1.50 ppm

Health Recommendations:

Health warnings of emergency conditions. The entire population is more likely to be affected.

10 AM
421 AQI
Hazardous air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 400.86 µg/m³
  • PM10: 402.26 µg/m³
  • O3: 0.090 ppm
  • NO2: 7.7 ppb
  • SO2: 1.4 ppb
  • CO: 1.42 ppm

Health Recommendations:

Health warnings of emergency conditions. The entire population is more likely to be affected.

11 AM
399 AQI
Hazardous air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 374.09 µg/m³
  • PM10: 375.52 µg/m³
  • O3: 0.122 ppm
  • NO2: 4.7 ppb
  • SO2: 1.4 ppb
  • CO: 1.36 ppm

Health Recommendations:

Health warnings of emergency conditions. The entire population is more likely to be affected.

12 PM
229 AQI
Very unhealthy air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 179.27 µg/m³
  • PM10: 180.24 µg/m³
  • O3: 0.117 ppm
  • NO2: 3.1 ppb
  • SO2: 1 ppb
  • CO: 0.73 ppm

Health Recommendations:

Health alert: the risk of health effects is increased for everyone.

1 PM
204 AQI
Very unhealthy air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 112.47 µg/m³
  • PM10: 113.2 µg/m³
  • O3: 0.109 ppm
  • NO2: 2.9 ppb
  • SO2: 0.8 ppb
  • CO: 0.50 ppm

Health Recommendations:

Health alert: the risk of health effects is increased for everyone.

2 PM
211 AQI
Very unhealthy air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 111.5 µg/m³
  • PM10: 112.19 µg/m³
  • O3: 0.116 ppm
  • NO2: 3.7 ppb
  • SO2: 0.9 ppb
  • CO: 0.50 ppm

Health Recommendations:

Health alert: the risk of health effects is increased for everyone.

3 PM
213 AQI
Very unhealthy air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 110.41 µg/m³
  • PM10: 111.07 µg/m³
  • O3: 0.117 ppm
  • NO2: 4.1 ppb
  • SO2: 0.9 ppb
  • CO: 0.50 ppm

Health Recommendations:

Health alert: the risk of health effects is increased for everyone.

4 PM
202 AQI
Very unhealthy air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 97.37 µg/m³
  • PM10: 97.99 µg/m³
  • O3: 0.107 ppm
  • NO2: 3.9 ppb
  • SO2: 0.8 ppb
  • CO: 0.44 ppm

Health Recommendations:

Health alert: the risk of health effects is increased for everyone.

5 PM
186 AQI
Unhealthy air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 87.43 µg/m³
  • PM10: 88.04 µg/m³
  • O3: 0.099 ppm
  • NO2: 3.7 ppb
  • SO2: 0.8 ppb
  • CO: 0.40 ppm

Health Recommendations:

Everyone may begin to experience health effects; sensitive groups may experience more serious effects.

6 PM
167 AQI
Unhealthy air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 77.61 µg/m³
  • PM10: 78.24 µg/m³
  • O3: 0.092 ppm
  • NO2: 3.8 ppb
  • SO2: 0.7 ppb
  • CO: 0.36 ppm

Health Recommendations:

Everyone may begin to experience health effects; sensitive groups may experience more serious effects.

7 PM
156 AQI
Unhealthy air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 66.81 µg/m³
  • PM10: 67.47 µg/m³
  • O3: 0.086 ppm
  • NO2: 3.8 ppb
  • SO2: 0.6 ppb
  • CO: 0.32 ppm

Health Recommendations:

Everyone may begin to experience health effects; sensitive groups may experience more serious effects.

8 PM
151 AQI
Unhealthy air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 57.9 µg/m³
  • PM10: 58.62 µg/m³
  • O3: 0.082 ppm
  • NO2: 3.7 ppb
  • SO2: 0.6 ppb
  • CO: 0.28 ppm

Health Recommendations:

Everyone may begin to experience health effects; sensitive groups may experience more serious effects.

9 PM
139 AQI
Unhealthy air quality for sensitive groups Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 51.08 µg/m³
  • PM10: 51.82 µg/m³
  • O3: 0.076 ppm
  • NO2: 3.3 ppb
  • SO2: 0.5 ppb
  • CO: 0.26 ppm

Health Recommendations:

Members of sensitive groups may experience health effects. The general public is less likely to be affected.

10 PM
129 AQI
Unhealthy air quality for sensitive groups Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 47.05 µg/m³
  • PM10: 47.81 µg/m³
  • O3: 0.069 ppm
  • NO2: 3 ppb
  • SO2: 0.4 ppb
  • CO: 0.24 ppm

Health Recommendations:

Members of sensitive groups may experience health effects. The general public is less likely to be affected.

11 PM
124 AQI
Unhealthy air quality for sensitive groups Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 44.97 µg/m³
  • PM10: 45.7 µg/m³
  • O3: 0.063 ppm
  • NO2: 2.7 ppb
  • SO2: 0.4 ppb
  • CO: 0.23 ppm

Health Recommendations:

Members of sensitive groups may experience health effects. The general public is less likely to be affected.

Weather Alerts and Warnings for Richland

Severe Future Likely

Extreme Heat Watch

Extreme Heat Watch issued July 20 at 5:54AM PDT until July 23 at 9:00PM PDT by NWS Pendleton OR
Jul 21, 11:00 AM Jul 23, 9:00 PM
WHAT: Dangerously hot conditions with temperatures 100 to 102
degrees, and 101 to 105 in the Columbia Basin possible. This will
pose a moderate to major risk of heat-related illness.

WHERE: Eastern Columbia River Gorge of Oregon and Washington,
Lower Columbia Basin of Oregon and Washington, Foothills of the
Northern Blue Mountains of Oregon, Yakima Valley, and Foothills of
the Blue Mountains of Washington.

WHEN: From Tuesday morning through Thursday evening.

IMPACTS: Heat related illnesses increase significantly during
extreme heat events.

ADDITIONAL DETAILS: The heat will begin on Tuesday, with
widespread moderate and locally major HeatRisk.

Wednesday looks to be the hottest day, with Major HeatRisk across
the Columbia Basin, Yakima Valley and portions of the Gorge and Blue
Mountain Foothills.

Thursday will also see widespread moderate HeatRisk and locally
major HeatRisk, mainly across the Columbia Basin.
+ Read More
Monitor the latest forecasts and warnings for updates on this situation. Be prepared to drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Young children and pets should never be left unattended in vehicles under any circumstances. This is especially true during warm or hot weather when car interiors can reach lethal temperatures in a matter of minutes.
Updated: Jul 20, 1:55 PM Source: NWS Alert
Moderate Expected Likely

Heat Advisory

Heat Advisory issued July 20 at 3:16PM PDT until July 23 at 9:00PM PDT by NWS Pendleton OR
Jul 21, 11:00 AM Jul 23, 9:00 PM
WHAT: Hot conditions with temperatures up to 100 to 103 degrees
expected, with 101 to 105 degrees in the Columbia Basin. This
will pose a moderate to major risk of heat-related illness.

WHERE: Eastern Columbia River Gorge of Oregon and Washington,
Lower Columbia Basin of Oregon and Washington, Foothills of the
Northern Blue Mountains of Oregon, Yakima Valley, and Foothills of
the Blue Mountains of Washington.

WHEN: From 11 AM Tuesday to 9 PM PDT Thursday.

IMPACTS: Hot temperatures may cause heat illnesses.

ADDITIONAL DETAILS: The heat will begin on Tuesday, with
widespread moderate and locally major HeatRisk.

Wednesday looks to be the hottest day, with Major HeatRisk across
the Columbia Basin, Yakima Valley and portions of the Gorge and Blue
Mountain Foothills.

Thursday will also see widespread moderate HeatRisk and locally
major HeatRisk, mainly across the Columbia Basin.

Smoke from area wildfires could end up affecting how hot
temperatures get.
+ Read More
Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Young children and pets should never be left unattended in vehicles under any circumstances. Take extra precautions if you work or spend time outside. When possible reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear lightweight and loose fitting clothing when possible. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1. For sheltering information and other human services in your area, dial 2 1 1 during business hours or visit 211info.org for Oregon or wa211.org for Washington anytime.
Updated: Jul 21, 12:32 AM Source: NWS Alert

Air Quality Alert

Air Quality Alert issued July 20 at 3:24PM PDT by NWS Pendleton OR
Jul 20, 3:24 PM Jul 21, 3:30 PM
The Washington State Department of Ecology and the Benton Clean Air
Agency has issued an Air Quality Alert until 9 AM PDT Wednesday.

For the Smoke Air Quality Alert, wildfires burning in the region
combined with forecasted conditions will cause air quality to reach
unhealthy levels.

Pollutants in smoke can cause burning eyes, runny nose, aggravate
heart and lung diseases, and aggravate other serious health
problems. Limit outdoor activities and keep children indoors if it
is smoky. Please follow medical advice if you have a heart or lung
condition.

Information about air quality from the Washington Department of
Ecology Web site is available at http://www.ecy.wa.gov/air.html or
call 360-407-6000.Information about air quality is on the Benton
County Clean Air Agency Web site at http://www.bentoncleanair.org or
call 509-783-1304.
Updated: Jul 21, 12:32 AM Source: NWS Alert