UV Rating Burn Time w/o protection Appropriate Actions Sun Protection Factor 9-10+ EXTREME LESS than 15 min. Stay Inside, If outside use full protection SPF 40+ every half hour 7-8 VERY HIGH 20 min. Stay Inside, If outside use full protection SPF 40+ every hour 5-6 HIGH 25 min. Do Not expose young children, use full protection SPF 25 every hour 3-4 MEDIUM 40 min. Wear hat, sunglasses and sunscreen SPF 15 every hour 1-2 LOW 60 min. Wear hat, sunglasses and sunscreen SPF 15 every hour