Today | Weather | Monday, September 21, 2026

Weather in Johnson City, Tennessee

03:50 PM
Now
Sunny with a Chance of Thunderstorms
86° F
Feels Like 90°
Precipitation 72 %
Wind 6 mph
UV Index (0 - 11+) 3
Humidity 56 %
Today
Sunny with a Chance of Thunderstorms
Day 88°
Night 64°
Precipitation 100 %
Wind 4 mph
UV Index (0 - 11+) 6

Johnson City Weather Forecast Updated

43 minutes ago
Last updated on
Weather Forecast History
Last Year's Weather on This Day (September 21, 2025)
Sunny with a Chance of Thunderstorms

Day

84°

Night

57°

Wind

4 mph

UV Index

60

Precipitation

55 %

Air Quality in Johnson City

NOW
36 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 2.95 µg/m³
PM10 3.28 µg/m³
O3 0.039 ppm
NO2 1.4 ppb
SO2 0.2 ppb
CO 0.12 ppm
NH3 0.63 µg/m³
NO 0.13 µg/m³
PM2.5 – Fine particles <2.5μm
PM10 – Inhalable particles <10μm
O3 – Ozone
NO2 – Nitrogen dioxide
SO2 – Sulfur dioxide
CO – Carbon monoxide
NH3 – Ammonia
NO – Nitric oxide

Health Recommendations:

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

Show raw pollutant concentrations (µg/m³)
PM2.52.95 µg/m³
PM103.28 µg/m³
O376.27 µg/m³
NO22.62 µg/m³
SO20.5 µg/m³
CO137.73 µg/m³
NH30.63 µg/m³
NO0.13 µg/m³