UV Index Louisville, KY today
Hourly forecast for 4:00 AM EDT, the current hour in Louisville (Tuesday, October 27)
No protection needed for most people.
UV is effectively zero at Louisville right now. Tomorrow is forecast to peak at 3.9 around 1:00 pm.
Sun protection times
Calculated from the clear-sky forecast, so it assumes no cloud. Cloud may reduce the UV level on the day, but it can clear at any time — treat these as the hours to be careful.
Today's forecast
Peak 3.9 at 1:00 pm, with cloud included.
Tomorrow
Forecast to peak at 3.9 Moderate around 1:00 pm.
This time of year
In October, NOAA's noon forecasts for Louisville typically put the UV around 4.0 Moderate.
Across 2015–2024, NOAA forecast UV of:
- 3 or more, when sun protection is needed, on 79% of October days
- 8 or more, Very High or worse, on no October days
- 11 or more, Extreme, on no October days
From the NOAA/EPA UV Index bulletins archived by NOAA's Climate Prediction Center: forecasts for solar noon, cloud included, not measurements; 310 October days.
What to do today
UV is forecast to reach 3.9 Moderate later today.
- Slip on clothing that covers your shoulders and back.
- Slop on SPF 50+ sunscreen 20 minutes before going out, and reapply every two hours.
- Slap on a broad-brimmed hat, and wrap on sunglasses.
- Seek shade around the middle of the day.
What the UV index numbers mean
Nearby
Forecast: US Environmental Protection Agency and the Copernicus Atmosphere Monitoring Service. About the EPA UV Index.
Forecast contains modified Copernicus Atmosphere Monitoring Service information 2026. Neither the European Commission nor ECMWF is responsible for any use of this information.