Hourly Weather | Today Thursday, February 26, 2026
Gaithersburg, Maryland
1 AM
Rainy Night
39°
Feels Like 36°
40
Humidity: 76%
UV Index: 0
Wind: 6 mph
2 AM
Cloudy Weather
37°
Feels Like 36°
37
Humidity: 81%
UV Index: 0
Wind: 5 mph
3 AM
Cloudy Night
37°
Feels Like 36°
26
Humidity: 82%
UV Index: 0
Wind: 5 mph
4 AM
Cloudy Night
36°
Feels Like 36°
12
Humidity: 80%
UV Index: 0
Wind: 5 mph
5 AM
Cloudy Night
34°
Feels Like 34°
12
Humidity: 82%
UV Index: 0
Wind: 5 mph
6 AM
Cloudy Night
36°
Feels Like 36°
16
Humidity: 77%
UV Index: 0
Wind: 5 mph
7 AM
Cloudy Weather
37°
Feels Like 36°
49
Humidity: 72%
UV Index: 0
Wind: 5 mph
8 AM
Cloudy Weather
37°
Feels Like 37°
49
Humidity: 68%
UV Index: 0
Wind: 6 mph
9 AM
Rainy Weather
41°
Feels Like 36°
56
Humidity: 64%
UV Index: 1
Wind: 6 mph
10 AM
Cloudy Weather
43°
Feels Like 41°
49
Humidity: 59%
UV Index: 1
Wind: 7 mph
11 AM
Rainy Weather
45°
Feels Like 39°
60
Humidity: 58%
UV Index: 1
Wind: 7 mph
12 PM
Rainy Weather
45°
Feels Like 41°
60
Humidity: 58%
UV Index: 1
Wind: 6 mph
1 PM
Rainy Weather
46°
Feels Like 34°
70
Humidity: 58%
UV Index: 1
Wind: 15 mph
2 PM
Rainy Weather
45°
Feels Like 36°
61
Humidity: 60%
UV Index: 1
Wind: 15 mph
3 PM
Rainy Weather
45°
Feels Like 32°
70
Humidity: 64%
UV Index: 1
Wind: 15 mph
4 PM
Cloudy Weather
45°
Feels Like 34°
40
Humidity: 65%
UV Index: 0
Wind: 15 mph
5 PM
Cloudy Weather
43°
Feels Like 32°
34
Humidity: 68%
UV Index: 0
Wind: 15 mph
6 PM
Cloudy Night
43°
Feels Like 30°
23
Humidity: 69%
UV Index: 0
Wind: 15 mph
7 PM
Cloudy Weather
39°
Feels Like 37°
3
Humidity: 72%
UV Index: 0
Wind: 5 mph
8 PM
Cloudy Night
37°
Feels Like 37°
3
Humidity: 75%
UV Index: 0
Wind: 5 mph
9 PM
Cloudy Night
36°
Feels Like 36°
3
Humidity: 77%
UV Index: 0
Wind: 5 mph
10 PM
Cloudy Night
34°
Feels Like 34°
3
Humidity: 80%
UV Index: 0
Wind: 4 mph
11 PM
Cloudy Night
34°
Feels Like 34°
3
Humidity: 81%
UV Index: 0
Wind: 4 mph

Hourly Air Quality Forecast - AQI (US EPA)

1 AM
46 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 5.23 µg/m³
  • PM10: 6.28 µg/m³
  • O3: 0.049 ppm
  • NO2: 1.3 ppb
  • SO2: 0.2 ppb
  • CO: 0.16 ppm

Health Recommendations:

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

2 AM
45 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 4.69 µg/m³
  • PM10: 5.65 µg/m³
  • O3: 0.049 ppm
  • NO2: 1.1 ppb
  • SO2: 0.2 ppb
  • CO: 0.16 ppm

Health Recommendations:

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

3 AM
44 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 4.18 µg/m³
  • PM10: 5.07 µg/m³
  • O3: 0.047 ppm
  • NO2: 1 ppb
  • SO2: 0.1 ppb
  • CO: 0.16 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 3.76 µg/m³
  • PM10: 4.61 µg/m³
  • O3: 0.046 ppm
  • NO2: 1 ppb
  • SO2: 0.1 ppb
  • CO: 0.16 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 3.56 µg/m³
  • PM10: 4.41 µg/m³
  • O3: 0.042 ppm
  • NO2: 1 ppb
  • SO2: 0.1 ppb
  • CO: 0.16 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 3.57 µg/m³
  • PM10: 4.55 µg/m³
  • O3: 0.038 ppm
  • NO2: 1.2 ppb
  • SO2: 0 ppb
  • CO: 0.16 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 3.76 µg/m³
  • PM10: 5.02 µg/m³
  • O3: 0.034 ppm
  • NO2: 1.9 ppb
  • SO2: 0 ppb
  • CO: 0.17 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 4.08 µg/m³
  • PM10: 5.6 µg/m³
  • O3: 0.030 ppm
  • NO2: 3.1 ppb
  • SO2: 0 ppb
  • CO: 0.18 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: O3
Details

Pollutant Concentrations:

  • PM2.5: 4.43 µg/m³
  • PM10: 6.1 µg/m³
  • O3: 0.027 ppm
  • NO2: 4.1 ppb
  • SO2: 0 ppb
  • CO: 0.19 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: 4.79 µg/m³
  • PM10: 6.55 µg/m³
  • O3: 0.025 ppm
  • NO2: 4.3 ppb
  • SO2: 0 ppb
  • CO: 0.20 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 4.96 µg/m³
  • PM10: 6.51 µg/m³
  • O3: 0.029 ppm
  • NO2: 3.6 ppb
  • SO2: 0.1 ppb
  • CO: 0.19 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 5.24 µg/m³
  • PM10: 6.77 µg/m³
  • O3: 0.029 ppm
  • NO2: 3.7 ppb
  • SO2: 0.2 ppb
  • CO: 0.19 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 5.75 µg/m³
  • PM10: 7.28 µg/m³
  • O3: 0.029 ppm
  • NO2: 4.1 ppb
  • SO2: 0.2 ppb
  • CO: 0.20 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: 5.93 µg/m³
  • PM10: 7.18 µg/m³
  • O3: 0.041 ppm
  • NO2: 3.6 ppb
  • SO2: 0.5 ppb
  • CO: 0.19 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 6.28 µg/m³
  • PM10: 7.57 µg/m³
  • O3: 0.043 ppm
  • NO2: 4 ppb
  • SO2: 0.5 ppb
  • CO: 0.19 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 7.01 µg/m³
  • PM10: 8.46 µg/m³
  • O3: 0.042 ppm
  • NO2: 5 ppb
  • SO2: 0.6 ppb
  • CO: 0.19 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 7.95 µg/m³
  • PM10: 9.65 µg/m³
  • O3: 0.038 ppm
  • NO2: 6.5 ppb
  • SO2: 0.5 ppb
  • CO: 0.21 ppm

Health Recommendations:

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

6 PM
37 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 8.93 µg/m³
  • PM10: 10.95 µg/m³
  • O3: 0.034 ppm
  • NO2: 8.5 ppb
  • SO2: 0.5 ppb
  • CO: 0.23 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 10.04 µg/m³
  • PM10: 12.42 µg/m³
  • O3: 0.030 ppm
  • NO2: 9.6 ppb
  • SO2: 0.4 ppb
  • CO: 0.24 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 11.26 µg/m³
  • PM10: 14.07 µg/m³
  • O3: 0.026 ppm
  • NO2: 10.4 ppb
  • SO2: 0.4 ppb
  • CO: 0.25 ppm

Health Recommendations:

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

9 PM
51 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 12.69 µg/m³
  • PM10: 15.98 µg/m³
  • O3: 0.023 ppm
  • NO2: 11.1 ppb
  • SO2: 0.3 ppb
  • CO: 0.27 ppm

Health Recommendations:

Air quality is acceptable; some pollutants may pose a risk for a small number of unusually sensitive people.

10 PM
55 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 14.16 µg/m³
  • PM10: 17.88 µg/m³
  • O3: 0.020 ppm
  • NO2: 11.6 ppb
  • SO2: 0.2 ppb
  • CO: 0.28 ppm

Health Recommendations:

Air quality is acceptable; some pollutants may pose a risk for a small number of unusually sensitive people.

11 PM
58 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 15.61 µg/m³
  • PM10: 19.62 µg/m³
  • O3: 0.018 ppm
  • NO2: 11.9 ppb
  • SO2: 0.1 ppb
  • CO: 0.29 ppm

Health Recommendations:

Air quality is acceptable; some pollutants may pose a risk for a small number of unusually sensitive people.