Hourly Weather | Today Friday, September 18, 2026
Sammamish, Washington
7 AM
Cloudy Weather
52°
Feels Like 50°
0
Humidity: 92%
UV Index: 0
Wind: 5 mph
8 AM
Cloudy Weather
54°
Feels Like 54°
0
Humidity: 88%
UV Index: 0
Wind: 6 mph
9 AM
Cloudy Weather
57°
Feels Like 57°
0
Humidity: 82%
UV Index: 1
Wind: 6 mph
10 AM
Cloudy Weather
61°
Feels Like 61°
0
Humidity: 75%
UV Index: 1
Wind: 6 mph
11 AM
Cloudy Weather
64°
Feels Like 64°
0
Humidity: 69%
UV Index: 1
Wind: 6 mph
12 PM
Cloudy Weather
66°
Feels Like 66°
0
Humidity: 63%
UV Index: 2
Wind: 6 mph
1 PM
Cloudy Weather
70°
Feels Like 70°
0
Humidity: 58%
UV Index: 2
Wind: 6 mph
2 PM
Cloudy Weather
72°
Feels Like 75°
0
Humidity: 54%
UV Index: 4
Wind: 6 mph
3 PM
Cloudy Weather
72°
Feels Like 75°
0
Humidity: 51%
UV Index: 3
Wind: 6 mph
4 PM
Cloudy Weather
73°
Feels Like 75°
0
Humidity: 48%
UV Index: 3
Wind: 5 mph
5 PM
Cloudy Weather
73°
Feels Like 73°
0
Humidity: 50%
UV Index: 2
Wind: 4 mph
6 PM
Cloudy Weather
72°
Feels Like 72°
0
Humidity: 53%
UV Index: 1
Wind: 4 mph
7 PM
Cloudy Weather
68°
Feels Like 66°
0
Humidity: 60%
UV Index: 0
Wind: 4 mph
8 PM
Cloudy Night
64°
Feels Like 64°
0
Humidity: 68%
UV Index: 0
Wind: 2 mph
9 PM
Cloudy Night
63°
Feels Like 63°
0
Humidity: 74%
UV Index: 0
Wind: 2 mph
10 PM
Cloudy Night
59°
Feels Like 59°
0
Humidity: 80%
UV Index: 0
Wind: 4 mph
11 PM
Cloudy Night
55°
Feels Like 55°
0
Humidity: 86%
UV Index: 0
Wind: 5 mph

Hourly Air Quality Forecast - AQI (US EPA)

7 AM
28 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 6.62 µg/m³
  • PM10: 9.48 µg/m³
  • O3: 0.016 ppm
  • NO2: 1.8 ppb
  • SO2: 0.2 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

8 AM
27 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 6.38 µg/m³
  • PM10: 9.63 µg/m³
  • O3: 0.016 ppm
  • NO2: 2.4 ppb
  • SO2: 0.2 ppb
  • CO: 0.15 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 6.06 µg/m³
  • PM10: 9.31 µg/m³
  • O3: 0.019 ppm
  • NO2: 2.3 ppb
  • SO2: 0.3 ppb
  • CO: 0.15 ppm

Health Recommendations:

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

10 AM
24 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 5.67 µg/m³
  • PM10: 8.77 µg/m³
  • O3: 0.020 ppm
  • NO2: 2.1 ppb
  • SO2: 0.3 ppb
  • CO: 0.15 ppm

Health Recommendations:

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

11 AM
22 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 5.17 µg/m³
  • PM10: 8.17 µg/m³
  • O3: 0.021 ppm
  • NO2: 2 ppb
  • SO2: 0.4 ppb
  • CO: 0.15 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 3.71 µg/m³
  • PM10: 6.37 µg/m³
  • O3: 0.033 ppm
  • NO2: 1.6 ppb
  • SO2: 0.6 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 3.34 µg/m³
  • PM10: 5.74 µg/m³
  • O3: 0.038 ppm
  • NO2: 1.2 ppb
  • SO2: 0.6 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 3.4 µg/m³
  • PM10: 5.85 µg/m³
  • O3: 0.041 ppm
  • NO2: 0.9 ppb
  • SO2: 0.6 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 3.48 µg/m³
  • PM10: 6.29 µg/m³
  • O3: 0.044 ppm
  • NO2: 0.8 ppb
  • SO2: 0.5 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 3.57 µg/m³
  • PM10: 6.96 µg/m³
  • O3: 0.044 ppm
  • NO2: 0.8 ppb
  • SO2: 0.5 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 3.61 µg/m³
  • PM10: 7.63 µg/m³
  • O3: 0.043 ppm
  • NO2: 0.9 ppb
  • SO2: 0.5 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 3.74 µg/m³
  • PM10: 8.5 µg/m³
  • O3: 0.039 ppm
  • NO2: 1.5 ppb
  • SO2: 0.4 ppb
  • CO: 0.14 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: 3.96 µg/m³
  • PM10: 9.55 µg/m³
  • O3: 0.033 ppm
  • NO2: 2.3 ppb
  • SO2: 0.3 ppb
  • CO: 0.14 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: 4.14 µg/m³
  • PM10: 10.43 µg/m³
  • O3: 0.029 ppm
  • NO2: 2.6 ppb
  • SO2: 0.2 ppb
  • CO: 0.15 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 4.2 µg/m³
  • PM10: 10.65 µg/m³
  • O3: 0.025 ppm
  • NO2: 2.7 ppb
  • SO2: 0.2 ppb
  • CO: 0.15 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 4.32 µg/m³
  • PM10: 10.71 µg/m³
  • O3: 0.021 ppm
  • NO2: 2.8 ppb
  • SO2: 0.1 ppb
  • CO: 0.15 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: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 4.39 µg/m³
  • PM10: 10.65 µg/m³
  • O3: 0.017 ppm
  • NO2: 2.9 ppb
  • SO2: 0.1 ppb
  • CO: 0.15 ppm

Health Recommendations:

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