Download the UV Index Today app - Get daily UV alerts

UV Index for Johnston, IA

Current Johnston UV Index

0 (Low)

Last Updated 28 minutes ago

Download the UV Index Today app - Get daily UV alerts

Hourly Johnston UV Index

The hourly Johnston, IA UV Index forecast for Thursday, March 5th, 2026.

5 Day Hourly Johnston UV Index Forecast

Last Updated 20 hours ago