Hourly Weather | Today Wednesday, April 29, 2026
Gaithersburg, Maryland
4 AM
Cloudy Night
52°
Feels Like 50°
1
Humidity: 87%
UV Index: 0
Wind: 6 mph
5 AM
Cloudy Night
52°
Feels Like 48°
3
Humidity: 90%
UV Index: 0
Wind: 6 mph
6 AM
Cloudy Night
50°
Feels Like 48°
3
Humidity: 94%
UV Index: 0
Wind: 6 mph
7 AM
Cloudy Weather
52°
Feels Like 52°
4
Humidity: 91%
UV Index: 1
Wind: 6 mph
8 AM
Cloudy Weather
54°
Feels Like 52°
7
Humidity: 86%
UV Index: 0
Wind: 6 mph
9 AM
Cloudy Weather
55°
Feels Like 55°
7
Humidity: 83%
UV Index: 1
Wind: 6 mph
10 AM
Cloudy Weather
57°
Feels Like 57°
7
Humidity: 80%
UV Index: 1
Wind: 7 mph
11 AM
Cloudy Weather
61°
Feels Like 61°
7
Humidity: 78%
UV Index: 1
Wind: 7 mph
12 PM
Cloudy Weather
61°
Feels Like 63°
7
Humidity: 78%
UV Index: 2
Wind: 7 mph
1 PM
Cloudy Weather
63°
Feels Like 63°
11
Humidity: 79%
UV Index: 2
Wind: 8 mph
2 PM
Cloudy Weather
63°
Feels Like 63°
49
Humidity: 80%
UV Index: 2
Wind: 8 mph
3 PM
Rainy Weather
64°
Feels Like 61°
62
Humidity: 80%
UV Index: 1
Wind: 8 mph
4 PM
Rainy Weather
63°
Feels Like 59°
62
Humidity: 84%
UV Index: 1
Wind: 8 mph
5 PM
Cloudy Weather
63°
Feels Like 61°
49
Humidity: 85%
UV Index: 1
Wind: 8 mph
6 PM
Rainy Weather
63°
Feels Like 57°
62
Humidity: 87%
UV Index: 0
Wind: 8 mph
7 PM
Rainy Weather
63°
Feels Like 55°
62
Humidity: 89%
UV Index: 0
Wind: 8 mph
8 PM
Stormy Weather
61°
Feels Like 55°
55
Humidity: 91%
UV Index: 0
Wind: 8 mph
9 PM
Cloudy Weather
59°
Feels Like 57°
49
Humidity: 95%
UV Index: 0
Wind: 7 mph
10 PM
Cloudy Weather
59°
Feels Like 57°
47
Humidity: 95%
UV Index: 0
Wind: 6 mph
11 PM
Cloudy Weather
57°
Feels Like 57°
46
Humidity: 96%
UV Index: 0
Wind: 6 mph

Hourly Air Quality Forecast - AQI (US EPA)

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

Pollutant Concentrations:

  • PM2.5: 2.77 µg/m³
  • PM10: 4.18 µg/m³
  • O3: 0.023 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.

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

Pollutant Concentrations:

  • PM2.5: 2.74 µg/m³
  • PM10: 4.18 µg/m³
  • O3: 0.024 ppm
  • NO2: 1.4 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
22 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 2.71 µg/m³
  • PM10: 4.21 µg/m³
  • O3: 0.024 ppm
  • NO2: 1.4 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
23 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 2.76 µg/m³
  • PM10: 4.39 µg/m³
  • O3: 0.024 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.

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

Pollutant Concentrations:

  • PM2.5: 2.95 µg/m³
  • PM10: 4.78 µg/m³
  • O3: 0.025 ppm
  • NO2: 2 ppb
  • SO2: 0.1 ppb
  • CO: 0.12 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 3.27 µg/m³
  • PM10: 5.12 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.

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

Pollutant Concentrations:

  • PM2.5: 3.55 µg/m³
  • PM10: 5.05 µg/m³
  • O3: 0.023 ppm
  • NO2: 2.6 ppb
  • SO2: 0.3 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 3.8 µg/m³
  • PM10: 4.99 µg/m³
  • O3: 0.023 ppm
  • NO2: 2.5 ppb
  • SO2: 0.3 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 4.17 µg/m³
  • PM10: 5.07 µg/m³
  • O3: 0.024 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
22 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 4.39 µg/m³
  • PM10: 5.02 µg/m³
  • O3: 0.024 ppm
  • NO2: 1.8 ppb
  • SO2: 0.2 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 4.46 µg/m³
  • PM10: 4.92 µg/m³
  • O3: 0.023 ppm
  • NO2: 1.5 ppb
  • SO2: 0.2 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 4.38 µg/m³
  • PM10: 4.71 µg/m³
  • O3: 0.023 ppm
  • NO2: 1.3 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
20 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 4 µg/m³
  • PM10: 4.25 µg/m³
  • O3: 0.021 ppm
  • NO2: 1.2 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: O3
Details

Pollutant Concentrations:

  • PM2.5: 3.4 µg/m³
  • PM10: 3.61 µg/m³
  • O3: 0.020 ppm
  • NO2: 1.2 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
15 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 2.94 µg/m³
  • PM10: 3.2 µg/m³
  • O3: 0.016 ppm
  • NO2: 1.3 ppb
  • SO2: 0.1 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 2.74 µg/m³
  • PM10: 3.14 µg/m³
  • O3: 0.012 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.

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

Pollutant Concentrations:

  • PM2.5: 2.69 µg/m³
  • PM10: 3.27 µg/m³
  • O3: 0.010 ppm
  • NO2: 1.9 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
12 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 2.84 µg/m³
  • PM10: 3.56 µg/m³
  • O3: 0.010 ppm
  • NO2: 2 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: 3 µg/m³
  • PM10: 3.79 µg/m³
  • O3: 0.010 ppm
  • NO2: 2 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
12 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 2.7 µg/m³
  • PM10: 3.45 µg/m³
  • O3: 0.013 ppm
  • NO2: 1.9 ppb
  • SO2: 0.1 ppb
  • CO: 0.15 ppm

Health Recommendations:

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