Naha, Japan UV Index in January
The average UV index in Naha, Japan in January is about 7.1 (High), peaking near 9.5 at midday on clear days. Fair skin (Type II) can burn in roughly 13 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 Naha, Japan in January?
Average UV
7.1
High
Midday Peak
9.5
Clear-sky estimate
Fair Skin Burn Time
13 min
Type II, no sunscreen
How long can you stay in the sun in Naha, Japan in January?
| Skin type | Time to first burn | With SPF 30 |
|---|---|---|
| Type 1 | 8 min | up to 240 min |
| Type 2 | 13 min | up to 240 min |
| Type 3 | 21 min | up to 240 min |
| Type 4 | 34 min | up to 240 min |
| Type 5 | 51 min | up to 240 min |
| Type 6 | 76 min | up to 240 min |
Estimates based on Naha, Japan's latitude and typical January 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.
When is the UV index highest and lowest in Naha, Japan?
Highest: May (about 9). Lowest: December (about 7).
| Month | Average UV | Midday peak | Level | Fair skin burn |
|---|---|---|---|---|
| January | 7.1 | 9.5 | High | 13 min |
| February | 7.7 | 10.3 | High | 12 min |
| March | 8.3 | 11.1 | Very High | 11 min |
| April | 8.8 | 11.7 | Very High | 10 min |
| May | 9 | 12 | Very High | 10 min |
| June | 9 | 12 | Very High | 10 min |
| July | 9 | 12 | Very High | 10 min |
| August | 8.9 | 11.9 | Very High | 10 min |
| September | 8.5 | 11.3 | Very High | 11 min |
| October | 7.9 | 10.5 | High | 11 min |
| November | 7.3 | 9.7 | High | 12 min |
| December | 7 | 9.3 | High | 13 min |
Common questions about UV in Naha, Japan in January
Do you need sunscreen in Naha, Japan in January?
Yes. A UV index of 7.1 is High, so use SPF 30+ on exposed skin between 10am and 4pm and reapply every two hours.
Can you tan in Naha, Japan in January?
Yes, UV of 7.1 is strong enough to tan. Fair skin can burn in about 13 minutes, so build exposure slowly and use sunscreen.
What time of day is UV strongest in Naha, Japan?
UV peaks around solar noon, roughly 11am to 2pm local time, when it can reach about 9.5 in January. Mornings and late afternoons are safest.
Is January a good month to visit Naha, Japan for the sun?
January averages UV 7.1, compared with a yearly high of 9 in May and a low of 7 in December. Darker skin (Type VI) can burn in about 76 minutes at this level.