Today | Weather | Monday, July 20, 2026

Weather in Knoxville, Tennessee

01:32 AM
Now
Foggy Weather
73° F
Feels Like 81°
Precipitation 20 %
Wind 5 mph
Humidity 96 %
Today
Sunny with a Chance of Thunderstorms
Day 90°
Night 73°
Precipitation 55 %
Wind 6 mph
UV Index (0 - 11+) 11

Warning: Extreme UV Index Today: 11

Overexposure to the sun's harmful UV rays can cause sunburn and increase the risk of developing skin cancer, including melanoma. Protect yourself by wearing clothing that covers your skin, sunglasses, and a hat. Apply a broad-spectrum sunscreen with an SPF of 30 or higher every two hours, even on cloudy days. Minimize direct sun exposure during peak hours (10 AM to 4 PM) to reduce the risk.

Knoxville Weather Forecast Updated

10 minutes ago
Last updated on
Weather Forecast History
Last Year's Weather on This Day (July 20, 2025)
Stormy Weather

Day

90°

Night

73°

Wind

5 mph

Precipitation

91 %

Air Quality in Knoxville

NOW
26 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 5.26 µg/m³
PM10 13.27 µg/m³
O3 0.028 ppm
NO2 3.2 ppb
SO2 0.1 ppb
CO 0.12 ppm
NH3 59.67 µg/m³
NO 0 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)
PM2.55.26 µg/m³
PM1013.27 µg/m³
O354.12 µg/m³
NO25.96 µg/m³
SO20.29 µg/m³
CO140.54 µg/m³
NH359.67 µg/m³
NO0 µg/m³