Download the UV Index Today app - Get daily UV alerts

UV Index for Sumner, WI

Current Sumner UV Index

0 (Low)

Last Updated 15 minutes ago

Download the UV Index Today app - Get daily UV alerts

Hourly Sumner UV Index

The hourly Sumner, WI UV Index forecast for Sunday, September 20th, 2026.

5 Day Hourly Sumner UV Index Forecast

Last Updated 17 hours ago