Today | Weather | Friday, September 18, 2026

Weather in Knoxville, Tennessee

11:36 AM
Now
Cloudy Weather
88° F
Feels Like 100°
Precipitation 20 %
Wind 4 mph
UV Index (0 - 11+) 6
Humidity 55 %
Today
Sunny with a Chance of Thunderstorms
Day 93°
Night 70°
Precipitation 70 %
Wind 4 mph
UV Index (0 - 11+) 6

Knoxville Weather Forecast Updated

22 minutes ago
Last updated on
Weather Forecast History
Last Year's Weather on This Day (September 18, 2025)
Night

Day

88°

Night

61°

Wind

4 mph

Precipitation

1 %

Air Quality in Knoxville

NOW
47 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 8.84 µg/m³
PM10 11.53 µg/m³
O3 0.050 ppm
NO2 0.5 ppb
SO2 0.7 ppb
CO 0.13 ppm
NH3 2.93 µg/m³
NO 0.14 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)
PM2.58.84 µg/m³
PM1011.53 µg/m³
O399.09 µg/m³
NO20.9 µg/m³
SO21.79 µg/m³
CO143.46 µg/m³
NH32.93 µg/m³
NO0.14 µg/m³