Hourly Weather | Today Friday, September 18, 2026
Hillsboro, Oregon
2 PM
Cloudy Weather
68°
Feels Like 75°
0
Humidity: 57%
UV Index: 4
Wind: 4 mph
3 PM
Cloudy Weather
70°
Feels Like 75°
0
Humidity: 53%
UV Index: 4
Wind: 4 mph
4 PM
Cloudy Weather
72°
Feels Like 75°
0
Humidity: 50%
UV Index: 3
Wind: 4 mph
5 PM
Cloudy Weather
73°
Feels Like 75°
0
Humidity: 47%
UV Index: 2
Wind: 4 mph
6 PM
Cloudy Weather
73°
Feels Like 73°
0
Humidity: 49%
UV Index: 1
Wind: 2 mph
7 PM
Cloudy Weather
70°
Feels Like 70°
0
Humidity: 54%
UV Index: 0
Wind: 2 mph
8 PM
Night
66°
Feels Like 64°
0
Humidity: 62%
UV Index: 0
Wind: 2 mph
9 PM
Night
64°
Feels Like 64°
0
Humidity: 69%
UV Index: 0
Wind: 2 mph
10 PM
Night
61°
Feels Like 63°
0
Humidity: 77%
UV Index: 0
Wind: 4 mph
11 PM
Night
59°
Feels Like 59°
0
Humidity: 84%
UV Index: 0
Wind: 4 mph

Hourly Air Quality Forecast - AQI (US EPA)

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

Pollutant Concentrations:

  • PM2.5: 3.11 µg/m³
  • PM10: 5.77 µg/m³
  • O3: 0.035 ppm
  • NO2: 0.3 ppb
  • SO2: 0.1 ppb
  • CO: 0.12 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 3.32 µg/m³
  • PM10: 6.22 µg/m³
  • O3: 0.037 ppm
  • NO2: 0.3 ppb
  • SO2: 0.1 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 3.47 µg/m³
  • PM10: 6.72 µg/m³
  • O3: 0.038 ppm
  • NO2: 0.3 ppb
  • SO2: 0.1 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 3.56 µg/m³
  • PM10: 7.21 µg/m³
  • O3: 0.038 ppm
  • NO2: 0.4 ppb
  • SO2: 0.1 ppb
  • CO: 0.13 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: 3.75 µg/m³
  • PM10: 7.93 µg/m³
  • O3: 0.035 ppm
  • NO2: 0.7 ppb
  • SO2: 0.1 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 3.92 µg/m³
  • PM10: 8.61 µg/m³
  • O3: 0.031 ppm
  • NO2: 1.1 ppb
  • SO2: 0.1 ppb
  • CO: 0.14 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: 3.96 µg/m³
  • PM10: 9.07 µg/m³
  • O3: 0.028 ppm
  • NO2: 1.2 ppb
  • SO2: 0.1 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 3.83 µg/m³
  • PM10: 8.33 µg/m³
  • O3: 0.021 ppm
  • NO2: 1.2 ppb
  • SO2: 0.1 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

10 PM
16 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 3.78 µg/m³
  • PM10: 7.33 µg/m³
  • O3: 0.014 ppm
  • NO2: 1.3 ppb
  • SO2: 0 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

11 PM
16 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 3.73 µg/m³
  • PM10: 6.52 µg/m³
  • O3: 0.010 ppm
  • NO2: 1.3 ppb
  • SO2: 0 ppb
  • CO: 0.13 ppm

Health Recommendations:

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