Hourly Weather | Today Wednesday, August 12, 2026
Active Weather Warnings
Johnson City, Tennessee
9 AM
Stormy Weather
68°
Feels Like 70°
42
Humidity: 100%
UV Index: 1
Wind: 6 mph
10 AM
Cloudy Weather
72°
Feels Like 79°
41
Humidity: 98%
UV Index: 2
Wind: 6 mph
11 AM
Cloudy Weather
75°
Feels Like 84°
33
Humidity: 90%
UV Index: 3
Wind: 6 mph
12 PM
Cloudy Weather
79°
Feels Like 90°
33
Humidity: 81%
UV Index: 5
Wind: 6 mph
1 PM
Cloudy Weather
81°
Feels Like 91°
39
Humidity: 76%
UV Index: 6
Wind: 6 mph
2 PM
Sunny with a Chance of Thunderstorms
79°
Feels Like 86°
51
Humidity: 86%
UV Index: 3
Wind: 6 mph
3 PM
Cloudy Weather
81°
Feels Like 91°
47
Humidity: 71%
UV Index: 5
Wind: 6 mph
4 PM
Cloudy Weather
82°
Feels Like 91°
40
Humidity: 66%
UV Index: 4
Wind: 6 mph
5 PM
Cloudy Weather
84°
Feels Like 91°
33
Humidity: 61%
UV Index: 3
Wind: 6 mph
6 PM
Cloudy Weather
82°
Feels Like 88°
33
Humidity: 66%
UV Index: 1
Wind: 6 mph
7 PM
Cloudy Weather
81°
Feels Like 84°
39
Humidity: 72%
UV Index: 1
Wind: 6 mph
8 PM
Stormy Weather
79°
Feels Like 79°
51
Humidity: 79%
UV Index: 0
Wind: 6 mph
9 PM
Cloudy Night
75°
Feels Like 81°
47
Humidity: 85%
UV Index: 0
Wind: 6 mph
10 PM
Cloudy Night
73°
Feels Like 79°
40
Humidity: 88%
UV Index: 0
Wind: 6 mph
11 PM
Cloudy Night
73°
Feels Like 75°
34
Humidity: 90%
UV Index: 0
Wind: 6 mph

Hourly Air Quality Forecast - AQI (US EPA)

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

Pollutant Concentrations:

  • PM2.5: 2.95 µg/m³
  • PM10: 3.48 µg/m³
  • O3: 0.008 ppm
  • NO2: 1.8 ppb
  • SO2: 0.1 ppb
  • CO: 0.11 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 2.9 µg/m³
  • PM10: 3.41 µg/m³
  • O3: 0.010 ppm
  • NO2: 1.5 ppb
  • SO2: 0.1 ppb
  • CO: 0.11 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 2.9 µg/m³
  • PM10: 3.39 µg/m³
  • O3: 0.013 ppm
  • NO2: 1.3 ppb
  • SO2: 0.1 ppb
  • CO: 0.11 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: 2.7 µg/m³
  • PM10: 3 µg/m³
  • O3: 0.024 ppm
  • NO2: 0.9 ppb
  • SO2: 0.1 ppb
  • CO: 0.10 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 2.44 µg/m³
  • PM10: 2.69 µg/m³
  • O3: 0.027 ppm
  • NO2: 0.6 ppb
  • SO2: 0.1 ppb
  • CO: 0.09 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 2.34 µg/m³
  • PM10: 2.57 µg/m³
  • O3: 0.028 ppm
  • NO2: 0.5 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 PM
29 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 2.42 µg/m³
  • PM10: 2.61 µg/m³
  • O3: 0.031 ppm
  • NO2: 0.5 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 PM
30 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 2.55 µg/m³
  • PM10: 2.72 µg/m³
  • O3: 0.033 ppm
  • NO2: 0.5 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 PM
31 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 2.62 µg/m³
  • PM10: 2.78 µg/m³
  • O3: 0.033 ppm
  • NO2: 0.6 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 PM
32 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 2.62 µg/m³
  • PM10: 2.82 µg/m³
  • O3: 0.034 ppm
  • NO2: 1.2 ppb
  • SO2: 0.1 ppb
  • CO: 0.10 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 2.57 µg/m³
  • PM10: 2.86 µg/m³
  • O3: 0.033 ppm
  • NO2: 2.1 ppb
  • SO2: 0.1 ppb
  • CO: 0.11 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 2.52 µg/m³
  • PM10: 2.9 µg/m³
  • O3: 0.031 ppm
  • NO2: 2.8 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 PM
24 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 2.49 µg/m³
  • PM10: 3 µg/m³
  • O3: 0.026 ppm
  • NO2: 3.2 ppb
  • SO2: 0.1 ppb
  • CO: 0.12 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 2.47 µg/m³
  • PM10: 3.15 µg/m³
  • O3: 0.021 ppm
  • NO2: 3.5 ppb
  • SO2: 0.1 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 2.44 µg/m³
  • PM10: 3.25 µg/m³
  • O3: 0.017 ppm
  • NO2: 3.5 ppb
  • SO2: 0.1 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

Weather Alerts and Warnings for Johnson City

Severe Future Possible

Flood Watch

Flood Watch issued August 12 at 2:38AM EDT until August 12 at 3:00PM EDT by NWS Morristown TN
Aug 12, 7:00 AM Aug 12, 3:00 PM
WHAT: Flash flooding caused by excessive rainfall is possible.

WHERE: Portions of east Tennessee, including the following areas,
Anderson, Blount Smoky Mountains, Campbell, Claiborne, Cocke Smoky
Mountains, Grainger, Hamblen, Hancock, Hawkins, Jefferson, Johnson,
Knox, North Sevier, Northwest Blount, Northwest Carter, Northwest
Cocke, Northwest Greene, Scott TN, Sevier Smoky Mountains,
Southeast Carter, Southeast Greene, Sullivan, Unicoi, Union and
Washington TN and southwest Virginia, including the following
areas, Lee, Russell, Scott VA, Washington VA and Wise.

WHEN: From 7 AM EDT this morning through this afternoon.

IMPACTS: Excessive runoff may result in flooding of rivers,
creeks, streams, and other low-lying and flood-prone locations.

ADDITIONAL DETAILS:
- Additional showers and storms are expected to spread into the
area this morning into the early afternoon. Due to recent
rainfall, poor antecedent soil conditions will lead to heightened
chances for localized flash flooding with this additional
convection.
- http://www.weather.gov/safety/flood
+ Read More
You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued.
Updated: Aug 12, 8:27 AM Source: NWS Alert