Hourly Weather | Today Monday, September 21, 2026
Marysville, Washington
1 PM
Cloudy Weather
66°
Feels Like 70°
11
Humidity: 67%
UV Index: 3
Wind: 6 mph
2 PM
Cloudy Weather
66°
Feels Like 70°
0
Humidity: 63%
UV Index: 3
Wind: 6 mph
3 PM
Cloudy Weather
68°
Feels Like 70°
0
Humidity: 61%
UV Index: 2
Wind: 7 mph
4 PM
Cloudy Weather
70°
Feels Like 70°
0
Humidity: 59%
UV Index: 2
Wind: 7 mph
5 PM
Cloudy Weather
68°
Feels Like 66°
0
Humidity: 62%
UV Index: 1
Wind: 7 mph
6 PM
Cloudy Weather
66°
Feels Like 64°
0
Humidity: 65%
UV Index: 1
Wind: 6 mph
7 PM
Cloudy Weather
64°
Feels Like 63°
0
Humidity: 72%
UV Index: 0
Wind: 6 mph
8 PM
Cloudy Night
61°
Feels Like 61°
0
Humidity: 78%
UV Index: 0
Wind: 5 mph
9 PM
Cloudy Night
59°
Feels Like 57°
0
Humidity: 83%
UV Index: 0
Wind: 5 mph
10 PM
Cloudy Night
57°
Feels Like 55°
0
Humidity: 88%
UV Index: 0
Wind: 6 mph
11 PM
Cloudy Night
57°
Feels Like 55°
0
Humidity: 87%
UV Index: 0
Wind: 6 mph

Hourly Air Quality Forecast - AQI (US EPA)

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

Pollutant Concentrations:

  • PM2.5: 5.62 µg/m³
  • PM10: 7.35 µg/m³
  • O3: 0.037 ppm
  • NO2: 2.1 ppb
  • SO2: 0.7 ppb
  • CO: 0.12 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: 5.38 µg/m³
  • PM10: 6.96 µg/m³
  • O3: 0.040 ppm
  • NO2: 1.7 ppb
  • SO2: 0.7 ppb
  • CO: 0.12 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 4.89 µg/m³
  • PM10: 6.25 µg/m³
  • O3: 0.043 ppm
  • NO2: 1.3 ppb
  • SO2: 0.7 ppb
  • CO: 0.11 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 4.17 µg/m³
  • PM10: 5.33 µg/m³
  • O3: 0.042 ppm
  • NO2: 1.1 ppb
  • SO2: 0.6 ppb
  • CO: 0.11 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 3.58 µg/m³
  • PM10: 4.6 µg/m³
  • O3: 0.041 ppm
  • NO2: 1.2 ppb
  • SO2: 0.5 ppb
  • CO: 0.11 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 3.31 µg/m³
  • PM10: 4.33 µg/m³
  • O3: 0.036 ppm
  • NO2: 2.2 ppb
  • SO2: 0.5 ppb
  • CO: 0.12 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 3.26 µg/m³
  • PM10: 4.42 µg/m³
  • O3: 0.030 ppm
  • NO2: 3.7 ppb
  • SO2: 0.4 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 3.21 µg/m³
  • PM10: 4.5 µg/m³
  • O3: 0.026 ppm
  • NO2: 4.4 ppb
  • SO2: 0.3 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 3.21 µg/m³
  • PM10: 4.62 µg/m³
  • O3: 0.023 ppm
  • NO2: 4.6 ppb
  • SO2: 0.3 ppb
  • CO: 0.14 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: 3.23 µg/m³
  • PM10: 4.74 µg/m³
  • O3: 0.021 ppm
  • NO2: 4.6 ppb
  • SO2: 0.2 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 3.16 µg/m³
  • PM10: 4.7 µg/m³
  • O3: 0.019 ppm
  • NO2: 4.5 ppb
  • SO2: 0.2 ppb
  • CO: 0.14 ppm

Health Recommendations:

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