Hourly Weather | Today Wednesday, March 18, 2026
Active Weather Warnings
Marysville, Washington
9 AM
Rainy Weather
54°
Feels Like 45°
69
Humidity: 93%
UV Index: 0
Wind: 12 mph
10 AM
Rainy Weather
54°
Feels Like 46°
64
Humidity: 91%
UV Index: 1
Wind: 14 mph
11 AM
Rainy Weather
55°
Feels Like 46°
70
Humidity: 89%
UV Index: 1
Wind: 15 mph
12 PM
Rainy Weather
57°
Feels Like 48°
70
Humidity: 86%
UV Index: 1
Wind: 16 mph
1 PM
Rainy Weather
57°
Feels Like 48°
70
Humidity: 84%
UV Index: 1
Wind: 16 mph
2 PM
Cloudy Weather
59°
Feels Like 54°
49
Humidity: 79%
UV Index: 1
Wind: 16 mph
3 PM
Rainy Weather
57°
Feels Like 48°
64
Humidity: 82%
UV Index: 1
Wind: 17 mph
4 PM
Rainy Weather
57°
Feels Like 48°
64
Humidity: 82%
UV Index: 1
Wind: 17 mph
5 PM
Rainy Weather
57°
Feels Like 48°
64
Humidity: 83%
UV Index: 0
Wind: 17 mph
6 PM
Rainy Weather
57°
Feels Like 46°
64
Humidity: 83%
UV Index: 0
Wind: 17 mph
7 PM
Cloudy Weather
57°
Feels Like 48°
49
Humidity: 84%
UV Index: 0
Wind: 18 mph
8 PM
Cloudy Weather
59°
Feels Like 52°
43
Humidity: 80%
UV Index: 0
Wind: 17 mph
9 PM
Cloudy Weather
59°
Feels Like 52°
47
Humidity: 79%
UV Index: 0
Wind: 17 mph
10 PM
Rainy Weather
59°
Feels Like 48°
51
Humidity: 79%
UV Index: 0
Wind: 18 mph
11 PM
Rainy Weather
59°
Feels Like 48°
51
Humidity: 77%
UV Index: 0
Wind: 18 mph

Hourly Air Quality Forecast - AQI (US EPA)

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

Pollutant Concentrations:

  • PM2.5: 2.1 µg/m³
  • PM10: 2.8 µg/m³
  • O3: 0.026 ppm
  • NO2: 2.4 ppb
  • SO2: 0.2 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 2.09 µg/m³
  • PM10: 2.76 µg/m³
  • O3: 0.025 ppm
  • NO2: 2.6 ppb
  • SO2: 0.2 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 2.03 µg/m³
  • PM10: 2.65 µg/m³
  • O3: 0.025 ppm
  • NO2: 2.5 ppb
  • SO2: 0.2 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 1.95 µg/m³
  • PM10: 2.56 µg/m³
  • O3: 0.025 ppm
  • NO2: 2.2 ppb
  • SO2: 0.3 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 1.94 µg/m³
  • PM10: 2.57 µg/m³
  • O3: 0.026 ppm
  • NO2: 2.1 ppb
  • SO2: 0.3 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 1.87 µg/m³
  • PM10: 2.48 µg/m³
  • O3: 0.027 ppm
  • NO2: 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.

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

Pollutant Concentrations:

  • PM2.5: 1.55 µg/m³
  • PM10: 2.1 µg/m³
  • O3: 0.030 ppm
  • NO2: 1.8 ppb
  • SO2: 0.3 ppb
  • CO: 0.12 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 1.45 µg/m³
  • PM10: 2.04 µg/m³
  • O3: 0.031 ppm
  • NO2: 1.8 ppb
  • SO2: 0.3 ppb
  • CO: 0.12 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 1.45 µg/m³
  • PM10: 2.09 µg/m³
  • O3: 0.032 ppm
  • NO2: 1.9 ppb
  • SO2: 0.4 ppb
  • CO: 0.12 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 1.49 µg/m³
  • PM10: 2.2 µg/m³
  • O3: 0.031 ppm
  • NO2: 2.3 ppb
  • SO2: 0.3 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: 1.58 µg/m³
  • PM10: 2.39 µg/m³
  • O3: 0.029 ppm
  • NO2: 2.8 ppb
  • SO2: 0.2 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 1.66 µg/m³
  • PM10: 2.58 µg/m³
  • O3: 0.028 ppm
  • NO2: 2.9 ppb
  • SO2: 0.2 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 1.71 µg/m³
  • PM10: 2.71 µg/m³
  • O3: 0.027 ppm
  • NO2: 2.8 ppb
  • SO2: 0.1 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 1.8 µg/m³
  • PM10: 2.86 µg/m³
  • O3: 0.026 ppm
  • NO2: 2.7 ppb
  • SO2: 0.1 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 1.89 µg/m³
  • PM10: 2.98 µg/m³
  • O3: 0.026 ppm
  • NO2: 2.7 ppb
  • SO2: 0.1 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

Weather Alerts and Warnings for Marysville

Severe Future Possible

Flood Watch

Flood Watch issued March 18 at 6:08AM PDT until March 20 at 5:00PM PDT by NWS Seattle WA
Mar 18, 1:00 PM Mar 20, 5:00 PM
WHAT: Flooding caused by excessive rainfall continues to be
possible.

WHERE: Portions of northwest and west central Washington,
including the following counties, in northwest Washington, Skagit
and Whatcom. In west central Washington, King and Snohomish.

WHEN: From 1 PM PDT this afternoon through Friday afternoon.

IMPACTS: Excessive runoff may result in flooding of rivers,
creeks, streams, and other low-lying and flood-prone locations.

ADDITIONAL DETAILS:
- High snow levels, heavy rainfall, and snowmelt runoff will
lead to rises on area rivers with flooding possible.
- http://www.weather.gov/safety/flood
+ Read More
You should monitor later forecasts and be alert for possible Flood Warnings. Those living in areas prone to flooding should be prepared to take action should flooding develop.
Updated: Mar 18, 7:16 AM Source: NWS Alert