Hourly Weather | Today Wednesday, April 29, 2026
Frederick, Maryland
4 AM
Cloudy Night
52°
Feels Like 50°
2
Humidity: 91%
UV Index: 0
Wind: 5 mph
5 AM
Cloudy Night
48°
Feels Like 48°
4
Humidity: 95%
UV Index: 0
Wind: 5 mph
6 AM
Cloudy Night
48°
Feels Like 48°
4
Humidity: 99%
UV Index: 0
Wind: 5 mph
7 AM
Cloudy Weather
50°
Feels Like 52°
5
Humidity: 93%
UV Index: 1
Wind: 5 mph
8 AM
Cloudy Weather
52°
Feels Like 52°
7
Humidity: 90%
UV Index: 0
Wind: 5 mph
9 AM
Cloudy Weather
54°
Feels Like 54°
7
Humidity: 87%
UV Index: 1
Wind: 6 mph
10 AM
Cloudy Weather
57°
Feels Like 57°
6
Humidity: 84%
UV Index: 1
Wind: 6 mph
11 AM
Cloudy Weather
57°
Feels Like 59°
5
Humidity: 82%
UV Index: 1
Wind: 7 mph
12 PM
Cloudy Weather
61°
Feels Like 61°
5
Humidity: 82%
UV Index: 2
Wind: 7 mph
1 PM
Cloudy Weather
61°
Feels Like 63°
8
Humidity: 83%
UV Index: 2
Wind: 7 mph
2 PM
Stormy Weather
63°
Feels Like 57°
74
Humidity: 84%
UV Index: 2
Wind: 8 mph
3 PM
Stormy Weather
63°
Feels Like 59°
74
Humidity: 83%
UV Index: 1
Wind: 7 mph
4 PM
Cloudy Weather
63°
Feels Like 63°
49
Humidity: 87%
UV Index: 1
Wind: 7 mph
5 PM
Cloudy Weather
63°
Feels Like 61°
24
Humidity: 88%
UV Index: 1
Wind: 7 mph
6 PM
Cloudy Weather
63°
Feels Like 61°
24
Humidity: 88%
UV Index: 0
Wind: 7 mph
7 PM
Cloudy Weather
61°
Feels Like 61°
30
Humidity: 90%
UV Index: 0
Wind: 7 mph
8 PM
Rainy Weather
61°
Feels Like 55°
62
Humidity: 93%
UV Index: 0
Wind: 7 mph
9 PM
Rainy Weather
61°
Feels Like 55°
62
Humidity: 93%
UV Index: 0
Wind: 6 mph
10 PM
Cloudy Weather
59°
Feels Like 57°
49
Humidity: 92%
UV Index: 0
Wind: 6 mph
11 PM
Cloudy Weather
57°
Feels Like 57°
34
Humidity: 92%
UV Index: 0
Wind: 6 mph

Hourly Air Quality Forecast - AQI (US EPA)

4 AM
19 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 4.14 µg/m³
  • PM10: 6.15 µg/m³
  • O3: 0.020 ppm
  • NO2: 1.6 ppb
  • SO2: 0.1 ppb
  • CO: 0.12 ppm

Health Recommendations:

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

5 AM
19 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 4.19 µg/m³
  • PM10: 6.26 µg/m³
  • O3: 0.020 ppm
  • NO2: 1.5 ppb
  • SO2: 0.1 ppb
  • CO: 0.12 ppm

Health Recommendations:

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

6 AM
19 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 4.16 µg/m³
  • PM10: 6.32 µg/m³
  • O3: 0.021 ppm
  • NO2: 1.5 ppb
  • SO2: 0.1 ppb
  • CO: 0.12 ppm

Health Recommendations:

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

7 AM
19 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 4.14 µg/m³
  • PM10: 6.49 µg/m³
  • O3: 0.020 ppm
  • NO2: 1.7 ppb
  • SO2: 0.1 ppb
  • CO: 0.12 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 4.2 µg/m³
  • PM10: 6.81 µg/m³
  • O3: 0.019 ppm
  • NO2: 2.3 ppb
  • SO2: 0.1 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 4.19 µg/m³
  • PM10: 6.75 µg/m³
  • O3: 0.019 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.

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

Pollutant Concentrations:

  • PM2.5: 4.07 µg/m³
  • PM10: 6.27 µg/m³
  • O3: 0.018 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.

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

Pollutant Concentrations:

  • PM2.5: 3.98 µg/m³
  • PM10: 5.79 µg/m³
  • O3: 0.018 ppm
  • NO2: 2.8 ppb
  • SO2: 0.2 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 4.02 µg/m³
  • PM10: 5.42 µg/m³
  • O3: 0.019 ppm
  • NO2: 2.7 ppb
  • SO2: 0.2 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 4.06 µg/m³
  • PM10: 5.11 µg/m³
  • O3: 0.020 ppm
  • NO2: 2.3 ppb
  • SO2: 0.2 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 4.16 µg/m³
  • PM10: 4.93 µg/m³
  • O3: 0.020 ppm
  • NO2: 2 ppb
  • SO2: 0.2 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 4.34 µg/m³
  • PM10: 4.89 µg/m³
  • O3: 0.021 ppm
  • NO2: 1.7 ppb
  • SO2: 0.1 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 4.41 µg/m³
  • PM10: 4.91 µg/m³
  • O3: 0.020 ppm
  • NO2: 1.5 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
18 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 4.2 µg/m³
  • PM10: 4.68 µg/m³
  • O3: 0.019 ppm
  • NO2: 1.6 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
16 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 3.93 µg/m³
  • PM10: 4.47 µg/m³
  • O3: 0.015 ppm
  • NO2: 1.7 ppb
  • SO2: 0.1 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 3.72 µg/m³
  • PM10: 4.38 µg/m³
  • O3: 0.012 ppm
  • NO2: 1.8 ppb
  • SO2: 0 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

8 PM
14 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 3.36 µg/m³
  • PM10: 4.15 µg/m³
  • O3: 0.011 ppm
  • NO2: 2.2 ppb
  • SO2: 0 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

9 PM
13 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 3.01 µg/m³
  • PM10: 3.88 µg/m³
  • O3: 0.011 ppm
  • NO2: 2.3 ppb
  • SO2: 0 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 2.81 µg/m³
  • PM10: 3.78 µg/m³
  • O3: 0.012 ppm
  • NO2: 2.1 ppb
  • SO2: 0.1 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 2.54 µg/m³
  • PM10: 3.46 µg/m³
  • O3: 0.016 ppm
  • NO2: 2.2 ppb
  • SO2: 0.1 ppb
  • CO: 0.15 ppm

Health Recommendations:

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