Hourly Weather | Today Tuesday, July 21, 2026
Active Weather Warnings
Flagstaff, Arizona
1 AM
Cloudy Weather
59°
Feels Like 59°
43
Humidity: 90%
UV Index: 0
Wind: 4 mph
2 AM
Cloudy Weather
59°
Feels Like 61°
47
Humidity: 88%
UV Index: 0
Wind: 4 mph
3 AM
Stormy Weather
61°
Feels Like 57°
51
Humidity: 87%
UV Index: 0
Wind: 4 mph
4 AM
Cloudy Night
59°
Feels Like 61°
40
Humidity: 88%
UV Index: 0
Wind: 2 mph
5 AM
Cloudy Weather
57°
Feels Like 57°
34
Humidity: 92%
UV Index: 0
Wind: 2 mph
6 AM
Cloudy Weather
55°
Feels Like 57°
29
Humidity: 94%
UV Index: 1
Wind: 4 mph
7 AM
Cloudy Weather
61°
Feels Like 63°
20
Humidity: 89%
UV Index: 1
Wind: 4 mph
8 AM
Cloudy Weather
64°
Feels Like 68°
20
Humidity: 82%
UV Index: 2
Wind: 5 mph
9 AM
Cloudy Weather
66°
Feels Like 70°
20
Humidity: 74%
UV Index: 3
Wind: 6 mph
10 AM
Cloudy Weather
70°
Feels Like 75°
20
Humidity: 66%
UV Index: 5
Wind: 6 mph
11 AM
Cloudy Weather
72°
Feels Like 79°
20
Humidity: 60%
UV Index: 6
Wind: 7 mph
12 PM
Cloudy Weather
72°
Feels Like 77°
18
Humidity: 61%
UV Index: 5
Wind: 7 mph
1 PM
Cloudy Weather
72°
Feels Like 73°
14
Humidity: 65%
UV Index: 4
Wind: 7 mph
2 PM
Cloudy Weather
70°
Feels Like 72°
14
Humidity: 70%
UV Index: 3
Wind: 7 mph
3 PM
Cloudy Weather
70°
Feels Like 70°
18
Humidity: 68%
UV Index: 2
Wind: 7 mph
4 PM
Cloudy Weather
70°
Feels Like 70°
47
Humidity: 67%
UV Index: 1
Wind: 7 mph
5 PM
Stormy Weather
70°
Feels Like 63°
51
Humidity: 80%
UV Index: 0
Wind: 6 mph
6 PM
Cloudy Weather
68°
Feels Like 66°
47
Humidity: 80%
UV Index: 0
Wind: 6 mph
7 PM
Cloudy Weather
66°
Feels Like 66°
20
Humidity: 79%
UV Index: 0
Wind: 5 mph
8 PM
Cloudy Weather
68°
Feels Like 66°
20
Humidity: 72%
UV Index: 0
Wind: 4 mph
9 PM
Cloudy Weather
66°
Feels Like 64°
20
Humidity: 73%
UV Index: 0
Wind: 4 mph
10 PM
Cloudy Weather
64°
Feels Like 64°
20
Humidity: 75%
UV Index: 0
Wind: 2 mph
11 PM
Cloudy Weather
63°
Feels Like 64°
20
Humidity: 78%
UV Index: 0
Wind: 2 mph

Hourly Air Quality Forecast - AQI (US EPA)

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

Pollutant Concentrations:

  • PM2.5: 3.72 µg/m³
  • PM10: 14.16 µg/m³
  • O3: 0.032 ppm
  • NO2: 1.8 ppb
  • SO2: 0.1 ppb
  • CO: 0.09 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 3.97 µg/m³
  • PM10: 15.75 µg/m³
  • O3: 0.030 ppm
  • NO2: 1.7 ppb
  • SO2: 0.1 ppb
  • CO: 0.09 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 4.26 µg/m³
  • PM10: 17.58 µg/m³
  • O3: 0.028 ppm
  • NO2: 1.7 ppb
  • SO2: 0.1 ppb
  • CO: 0.09 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 4.52 µg/m³
  • PM10: 19.33 µg/m³
  • O3: 0.026 ppm
  • NO2: 1.6 ppb
  • SO2: 0.1 ppb
  • CO: 0.09 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 4.83 µg/m³
  • PM10: 21.3 µg/m³
  • O3: 0.025 ppm
  • NO2: 1.6 ppb
  • SO2: 0.1 ppb
  • CO: 0.09 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: PM10
Details

Pollutant Concentrations:

  • PM2.5: 5.15 µg/m³
  • PM10: 23.44 µg/m³
  • O3: 0.024 ppm
  • NO2: 1.6 ppb
  • SO2: 0.1 ppb
  • CO: 0.09 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: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 5.41 µg/m³
  • PM10: 25.27 µg/m³
  • O3: 0.023 ppm
  • NO2: 1.7 ppb
  • SO2: 0.1 ppb
  • CO: 0.09 ppm

Health Recommendations:

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

8 AM
26 AQI
Good air quality Dominant pollutant: PM10
Details

Pollutant Concentrations:

  • PM2.5: 5.73 µg/m³
  • PM10: 27.61 µg/m³
  • O3: 0.022 ppm
  • NO2: 2 ppb
  • SO2: 0.1 ppb
  • CO: 0.09 ppm

Health Recommendations:

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

9 AM
28 AQI
Good air quality Dominant pollutant: PM10
Details

Pollutant Concentrations:

  • PM2.5: 6.16 µg/m³
  • PM10: 30.76 µg/m³
  • O3: 0.024 ppm
  • NO2: 2.1 ppb
  • SO2: 0.2 ppb
  • CO: 0.09 ppm

Health Recommendations:

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

10 AM
31 AQI
Good air quality Dominant pollutant: PM10
Details

Pollutant Concentrations:

  • PM2.5: 6.62 µg/m³
  • PM10: 33.88 µg/m³
  • O3: 0.029 ppm
  • NO2: 1.9 ppb
  • SO2: 0.2 ppb
  • CO: 0.09 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 6.96 µg/m³
  • PM10: 33.9 µg/m³
  • O3: 0.036 ppm
  • NO2: 1.4 ppb
  • SO2: 0.2 ppb
  • CO: 0.09 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 7.38 µg/m³
  • PM10: 33.24 µg/m³
  • O3: 0.043 ppm
  • NO2: 1 ppb
  • SO2: 0.1 ppb
  • CO: 0.09 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 6.77 µg/m³
  • PM10: 29.41 µg/m³
  • O3: 0.046 ppm
  • NO2: 0.7 ppb
  • SO2: 0.1 ppb
  • CO: 0.08 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 5.86 µg/m³
  • PM10: 24.32 µg/m³
  • O3: 0.047 ppm
  • NO2: 0.6 ppb
  • SO2: 0.1 ppb
  • CO: 0.08 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 5.29 µg/m³
  • PM10: 21.04 µg/m³
  • O3: 0.048 ppm
  • NO2: 0.5 ppb
  • SO2: 0.1 ppb
  • CO: 0.08 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 4.86 µg/m³
  • PM10: 18.72 µg/m³
  • O3: 0.049 ppm
  • NO2: 0.6 ppb
  • SO2: 0.1 ppb
  • CO: 0.08 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 4.55 µg/m³
  • PM10: 16.97 µg/m³
  • O3: 0.049 ppm
  • NO2: 0.9 ppb
  • SO2: 0.1 ppb
  • CO: 0.09 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 4.19 µg/m³
  • PM10: 15.21 µg/m³
  • O3: 0.048 ppm
  • NO2: 1.2 ppb
  • SO2: 0.1 ppb
  • CO: 0.09 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: O3
Details

Pollutant Concentrations:

  • PM2.5: 3.83 µg/m³
  • PM10: 13.42 µg/m³
  • O3: 0.046 ppm
  • NO2: 1.8 ppb
  • SO2: 0.1 ppb
  • CO: 0.09 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 3.5 µg/m³
  • PM10: 11.91 µg/m³
  • O3: 0.043 ppm
  • NO2: 2.2 ppb
  • SO2: 0.1 ppb
  • CO: 0.10 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 3.16 µg/m³
  • PM10: 10.49 µg/m³
  • O3: 0.042 ppm
  • NO2: 2.2 ppb
  • SO2: 0.1 ppb
  • CO: 0.10 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 2.83 µg/m³
  • PM10: 9.08 µg/m³
  • O3: 0.040 ppm
  • NO2: 2 ppb
  • SO2: 0.1 ppb
  • CO: 0.10 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 2.76 µg/m³
  • PM10: 8.54 µg/m³
  • O3: 0.038 ppm
  • NO2: 2.1 ppb
  • SO2: 0.1 ppb
  • CO: 0.10 ppm

Health Recommendations:

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

Weather Alerts and Warnings for Flagstaff

Severe Future Possible

Flood Watch

Flood Watch issued July 20 at 10:33PM MST until July 21 at 10:00PM MST by NWS Flagstaff AZ
Jul 21, 12:00 PM Jul 21, 11:00 PM
WHAT: Flash flooding caused by excessive rainfall continues to be
possible.

WHERE: Portions of east central, north central, northeast, and
west central Arizona, including the following areas, in east
central Arizona, Northern Gila County. In north central Arizona,
Black Mesa Area, Coconino Plateau, Eastern Mogollon Rim, Grand
Canyon Country, Kaibab Plateau, Little Colorado River Valley in
Coconino County, Marble and Glen Canyons, Northeast Plateaus and
Mesas Hwy 264 Northward, Northeast Plateaus and Mesas South of Hwy
264 and Western Mogollon Rim. In northeast Arizona, Little Colorado
River Valley in Apache County, Little Colorado River Valley in
Navajo County and White Mountains. In west central Arizona, Yavapai
County Mountains.

WHEN: From Tuesday morning through Tuesday evening.

IMPACTS: Flash flooding will be possible in creeks, normally dry
washes, swimming holes, and over recently burned areas. Raging
killer currents will be possible in side canyons and narrow slot
canyons. Low-water crossings may be flooded.

ADDITIONAL DETAILS:
- Deep monsoon moisture in place across northern Arizona will lead
to storms capable of producing rainfall in excess of 2 inches per
hour, resulting in an enhanced risk of flash flooding.
- Additional information is available at weather.gov/flagstaff.
+ Read More
Have a way to receive Flash Flood Warnings and be prepared to take action should warnings be issued.
Updated: Jul 21, 12:17 AM Source: NWS Alert