Today | Weather | Tuesday, September 23, 2025

Weather in Knoxville, Tennessee

04:17 AM

Now

68° F

Feels Like 66°

Precipitation 35 %

Wind 5 mph

Humidity 89 %

Today

Day 82°

Night 64°

Precipitation 25 %

Wind 11

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

Last updated on September 23, 2025 3:14 AM

Weather Forecast History

Last Year's Weather on This Day (September 23, 2024)

Day

91°

Night

66°

Wind

4 mph

Precipitation

Air quality in Knoxville

NOW

55 AQI

Moderate air quality Dominant pollutant: PM2.5

Pollutant Concentrations:

PM2.5 9.91 µg/m³

PM10 15.86 µg/m³

O₃ 14.56 ppb

NO₂ 9.62 ppb

SO₂ 0.37 ppb

CO 242.23 ppb

PM_2.5 – Fine particles <2.5μm

PM₁₀ – Inhalable particles <10μm

O₃ – Ozone

NO₂ – Nitrogen dioxide

SO₂ – Sulfur dioxide

CO – Carbon monoxide

Health Recommendations:

Air quality is currently in the acceptable range. However, sensitive individuals should be aware of potential risks from certain pollutants.

View Hourly Air Quality Forecast