Today | Weather | Sunday, September 21, 2025

Weather in Louisville, Kentucky

07:30 AM
Now
Cloudy Night
64° F
Feels Like 64°
Precipitation 37 %
Wind 5 mph
Humidity 95 %
Today
Sunny with a Chance of Thunderstorms
Day 84°
Night 64°
Precipitation 56 %
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.

Louisville Weather Forecast Updated

24 minutes ago
Last updated on

Weather Forecast History

Last Year's Weather on This Day (September 21, 2024)

Cloudy Weather

Day

91°

Night

70°

Wind

4 mph

UV Index

4

Precipitation

58

Air quality in Louisville

NOW
71 AQI
Moderate air quality Dominant pollutant: PM2.5

Pollutant Concentrations:

PM2.5 16.09 µg/m³
PM10 16.26 µg/m³
O₃ 19.57 ppb
NO₂ 11.12 ppb
SO₂ 1.54 ppb
CO 281.59 ppb
PM2.5 – 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.