St. George, Utah, USA UV Index in May
The average UV index in St. George, Utah, USA in May is about 7.9 (High), peaking near 11.9 at midday on clear days. Fair skin (Type II) can burn in roughly 11 minutes without sunscreen. SPF 30–50 sunscreen, a hat and sunglasses are essential. Seek shade between 11am and 3pm.
What is the UV index in St. George, Utah, USA in May?
Average UV
7.9
High
Midday Peak
11.9
Clear-sky estimate
Fair Skin Burn Time
11 min
Type II, no sunscreen
How long can you stay in the sun in St. George, Utah, USA in May?
| Skin type | Time to first burn | With SPF 30 |
|---|---|---|
| Type 1 | 8 min | up to 240 min |
| Type 2 | 11 min | up to 240 min |
| Type 3 | 19 min | up to 240 min |
| Type 4 | 30 min | up to 240 min |
| Type 5 | 46 min | up to 240 min |
| Type 6 | 68 min | up to 240 min |
Estimates based on St. George, Utah, USA's latitude and typical May sun angle. Cloud cover, altitude and reflection from water or sand can raise or lower the real UV. Check the live forecast before long days outside.
St. George, Utah, USA UV Index by Month
When is the UV index highest and lowest in St. George, Utah, USA?
Highest: June (about 8). Lowest: December (about 5.3).
| Month | Average UV | Midday peak | Level | Fair skin burn |
|---|---|---|---|---|
| January | 5.5 | 8.3 | Moderate | 16 min |
| February | 6.2 | 9.3 | High | 15 min |
| March | 6.9 | 10.4 | High | 13 min |
| April | 7.6 | 11.4 | High | 12 min |
| May | 7.9 | 11.9 | High | 11 min |
| June | 8 | 12 | Very High | 11 min |
| July | 8 | 12 | Very High | 11 min |
| August | 7.7 | 11.6 | High | 12 min |
| September | 7.2 | 10.8 | High | 13 min |
| October | 6.5 | 9.8 | High | 14 min |
| November | 5.7 | 8.6 | Moderate | 16 min |
| December | 5.3 | 8 | Moderate | 17 min |
Common questions about UV in St. George, Utah, USA in May
Do you need sunscreen in St. George, Utah, USA in May?
Yes. A UV index of 7.9 is High, so use SPF 30+ on exposed skin between 10am and 4pm and reapply every two hours.
Can you tan in St. George, Utah, USA in May?
Yes, UV of 7.9 is strong enough to tan. Fair skin can burn in about 11 minutes, so build exposure slowly and use sunscreen.
What time of day is UV strongest in St. George, Utah, USA?
UV peaks around solar noon, roughly 11am to 2pm local time, when it can reach about 11.9 in May. Mornings and late afternoons are safest.
Is May a good month to visit St. George, Utah, USA for the sun?
May averages UV 7.9, compared with a yearly high of 8 in June and a low of 5.3 in December. Darker skin (Type VI) can burn in about 68 minutes at this level.