Martha's Vineyard Massachusetts USA UV Index in July
The average UV index in Martha's Vineyard Massachusetts USA in July is about 5 (Moderate), peaking near 8 at midday on clear days. Fair skin (Type II) can burn in roughly 18 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 Martha's Vineyard Massachusetts USA in July?
Average UV
5
Moderate
Midday Peak
8
Clear-sky estimate
Fair Skin Burn Time
18 min
Type II, no sunscreen
How long can you stay in the sun in Martha's Vineyard Massachusetts USA in July?
| Skin type | Time to first burn | With SPF 30 |
|---|---|---|
| Type 1 | 12 min | up to 240 min |
| Type 2 | 18 min | up to 240 min |
| Type 3 | 30 min | up to 240 min |
| Type 4 | 48 min | up to 240 min |
| Type 5 | 72 min | up to 240 min |
| Type 6 | 108 min | up to 240 min |
Estimates based on Martha's Vineyard Massachusetts USA's latitude and typical July 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.
Martha's Vineyard Massachusetts USA UV Index by Month
When is the UV index highest and lowest in Martha's Vineyard Massachusetts USA?
Highest: June (about 5). Lowest: December (about 3.1).
| Month | Average UV | Midday peak | Level | Fair skin burn |
|---|---|---|---|---|
| January | 3.2 | 5.1 | Moderate | 28 min |
| February | 3.7 | 5.9 | Moderate | 24 min |
| March | 4.2 | 6.7 | Moderate | 21 min |
| April | 4.7 | 7.5 | Moderate | 19 min |
| May | 4.9 | 7.8 | Moderate | 18 min |
| June | 5 | 8 | Moderate | 18 min |
| July | 5 | 8 | Moderate | 18 min |
| August | 4.8 | 7.7 | Moderate | 19 min |
| September | 4.4 | 7 | Moderate | 20 min |
| October | 3.9 | 6.2 | Moderate | 23 min |
| November | 3.4 | 5.4 | Moderate | 26 min |
| December | 3.1 | 5 | Moderate | 29 min |
Common questions about UV in Martha's Vineyard Massachusetts USA in July
Do you need sunscreen in Martha's Vineyard Massachusetts USA in July?
Yes. A UV index of 5 is Moderate, so use SPF 30+ on exposed skin between 10am and 4pm and reapply every two hours.
Can you tan in Martha's Vineyard Massachusetts USA in July?
Yes, UV of 5 is strong enough to tan. Fair skin can burn in about 18 minutes, so build exposure slowly and use sunscreen.
What time of day is UV strongest in Martha's Vineyard Massachusetts USA?
UV peaks around solar noon, roughly 11am to 2pm local time, when it can reach about 8 in July. Mornings and late afternoons are safest.
Is July a good month to visit Martha's Vineyard Massachusetts USA for the sun?
July averages UV 5, compared with a yearly high of 5 in June and a low of 3.1 in December. Darker skin (Type VI) can burn in about 108 minutes at this level.