Ha Long Bay, Vietnam UV Index in December
The average UV index in Ha Long Bay, Vietnam in December is about 5.7 (Moderate), peaking near 8.1 at midday on clear days. Fair skin (Type II) can burn in roughly 16 minutes without sunscreen. Wear SPF 30+ sunscreen if you are outside for more than an hour, especially near water or sand.
What is the UV index in Ha Long Bay, Vietnam in December?
Average UV
5.7
Moderate
Midday Peak
8.1
Clear-sky estimate
Fair Skin Burn Time
16 min
Type II, no sunscreen
How long can you stay in the sun in Ha Long Bay, Vietnam in December?
| Skin type | Time to first burn | With SPF 30 |
|---|---|---|
| Type 1 | 11 min | up to 240 min |
| Type 2 | 16 min | up to 240 min |
| Type 3 | 26 min | up to 240 min |
| Type 4 | 42 min | up to 240 min |
| Type 5 | 63 min | up to 240 min |
| Type 6 | 95 min | up to 240 min |
Estimates based on Ha Long Bay, Vietnam'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.
Ha Long Bay, Vietnam UV Index by Month
When is the UV index highest and lowest in Ha Long Bay, Vietnam?
Highest: May (about 7). Lowest: December (about 5.7).
| Month | Average UV | Midday peak | Level | Fair skin burn |
|---|---|---|---|---|
| January | 5.8 | 8.3 | Moderate | 16 min |
| February | 6.2 | 8.9 | High | 15 min |
| March | 6.6 | 9.4 | High | 14 min |
| April | 6.9 | 9.9 | High | 13 min |
| May | 7 | 10 | High | 13 min |
| June | 7 | 10 | High | 13 min |
| July | 7 | 10 | High | 13 min |
| August | 7 | 10 | High | 13 min |
| September | 6.8 | 9.7 | High | 13 min |
| October | 6.4 | 9.1 | High | 14 min |
| November | 6 | 8.6 | High | 15 min |
| December | 5.7 | 8.1 | Moderate | 16 min |
Common questions about UV in Ha Long Bay, Vietnam in December
Do you need sunscreen in Ha Long Bay, Vietnam in December?
Yes. A UV index of 5.7 is Moderate, so use SPF 30+ on exposed skin between 10am and 4pm and reapply every two hours.
Can you tan in Ha Long Bay, Vietnam in December?
Yes, UV of 5.7 is strong enough to tan. Fair skin can burn in about 16 minutes, so build exposure slowly and use sunscreen.
What time of day is UV strongest in Ha Long Bay, Vietnam?
UV peaks around solar noon, roughly 11am to 2pm local time, when it can reach about 8.1 in December. Mornings and late afternoons are safest.
Is December a good month to visit Ha Long Bay, Vietnam for the sun?
December averages UV 5.7, compared with a yearly high of 7 in May and a low of 5.7 in December. Darker skin (Type VI) can burn in about 95 minutes at this level.