St. Barts, St. Barthélemy UV Index in December
The average UV index in St. Barts, St. Barthélemy in December is about 8.5 (Very High), peaking near 11.1 at midday on clear days. Fair skin (Type II) can burn in roughly 11 minutes without sunscreen. SPF 50+ sunscreen, protective clothing, hat and sunglasses. Minimise midday sun exposure.
What is the UV index in St. Barts, St. Barthélemy in December?
Average UV
8.5
Very High
Midday Peak
11.1
Clear-sky estimate
Fair Skin Burn Time
11 min
Type II, no sunscreen
How long can you stay in the sun in St. Barts, St. Barthélemy in December?
| Skin type | Time to first burn | With SPF 30 |
|---|---|---|
| Type 1 | 7 min | up to 210 min |
| Type 2 | 11 min | up to 240 min |
| Type 3 | 18 min | up to 240 min |
| Type 4 | 28 min | up to 240 min |
| Type 5 | 42 min | up to 240 min |
| Type 6 | 64 min | up to 240 min |
Estimates based on St. Barts, St. Barthélemy's latitude and typical December 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. Barts, St. Barthélemy UV Index by Month
When is the UV index highest and lowest in St. Barts, St. Barthélemy?
Highest: April (about 10). Lowest: December (about 8.5).
| Month | Average UV | Midday peak | Level | Fair skin burn |
|---|---|---|---|---|
| January | 8.6 | 11.2 | Very High | 10 min |
| February | 9.1 | 11.8 | Very High | 10 min |
| March | 9.6 | 12 | Very High | 9 min |
| April | 10 | 12 | Very High | 9 min |
| May | 10 | 12 | Very High | 9 min |
| June | 10 | 12 | Very High | 9 min |
| July | 10 | 12 | Very High | 9 min |
| August | 10 | 12 | Very High | 9 min |
| September | 9.8 | 12 | Very High | 9 min |
| October | 9.3 | 12 | Very High | 10 min |
| November | 8.8 | 11.4 | Very High | 10 min |
| December | 8.5 | 11.1 | Very High | 11 min |
Common questions about UV in St. Barts, St. Barthélemy in December
Do you need sunscreen in St. Barts, St. Barthélemy in December?
Yes. A UV index of 8.5 is Very High, so use SPF 30+ on exposed skin between 10am and 4pm and reapply every two hours.
Can you tan in St. Barts, St. Barthélemy in December?
Yes, UV of 8.5 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. Barts, St. Barthélemy?
UV peaks around solar noon, roughly 11am to 2pm local time, when it can reach about 11.1 in December. Mornings and late afternoons are safest.
Is December a good month to visit St. Barts, St. Barthélemy for the sun?
December averages UV 8.5, compared with a yearly high of 10 in April and a low of 8.5 in December. Darker skin (Type VI) can burn in about 64 minutes at this level.