United States
UV Index in Idaho — Current UV Levels
Check the current UV index for 1 cities in Idaho. Select a city below for real-time UV data, hourly forecasts, and sun protection advice.
UV Index by City in Idaho
Sun Safety in Idaho
UV levels in Idaho vary by season, altitude, and proximity to water. The WHO recommends sun protection whenever UV reaches 3 or higher. Apply SPF 30+ before outdoor activities and reapply every 2 hours.
UV Index in Idaho: What to Know
Idaho combines northern latitude with high elevation, so UV climbs higher than you might expect in its mountain regions during summer.
Across Idaho, the UV index peaks in the four hours around solar noon (roughly noon to 3 PM local time). The World Health Organization recommends sun protection whenever the UV index reaches 3 or higher: apply broad-spectrum SPF 30 at UV 3–5, SPF 50 at UV 6–7, and SPF 50+ with reapplication every two hours at UV 8 and above. Check the live, hour-by-hour UV index for Boise on the city pages above before heading outdoors.
Common Questions About UV in Idaho
When is the UV index highest in Idaho?
UV in Idaho is strongest between noon and 3 PM local time, and highest in the summer months when the sun sits highest in the sky. Check the hourly chart for Boise above to see today's exact peak.
Do I need sunscreen in Idaho?
Yes — whenever the UV index reaches 3 or higher, which in Idaho covers most of the daytime hours from spring through fall. Even on cloudy days, up to 80% of UV can reach the ground.
How accurate is this UV data for Idaho?
Our UV index for Idaho comes from Open-Meteo, which aggregates national weather-service models, and updates every 15 minutes. Levels follow the official WHO global solar UV index scale.