Nantucket, Massachusetts: vitamin D, best months and travel guide
Cobblestone island of grey shingles and quiet beaches. Best for: couples, luxury travellers.
The best months for vitamin D in Nantucket are June to August, when a full dose takes about 7 minutes at midday. Too cool from September to May.
Nantucket month by month
| Month | Rating | Sun window | Peak UV | Full dose, age 30 | Afternoon high | Rainy days |
|---|---|---|---|---|---|---|
| January | Too cold | 0.8 h | 2.0 | – | 4°C | 11/30 |
| February | Too cold | 3.2 h | 3.2 | 17 min | 5°C | 5/30 |
| March | Too cold | 4.0 h | 4.0 | 13 min | 9°C | 9/30 |
| April | Too cold | 6.1 h | 5.6 | 10 min | 12°C | 7/30 |
| May | Too cold | 7.4 h | 6.6 | 8 min | 17°C | 3/30 |
| June | Excellent | 8.9 h | 7.5 | 7 min | 24°C | 3/30 |
| July | Excellent | 8.7 h | 7.3 | 7 min | 26°C | 4/30 |
| August | Excellent | 8.4 h | 7.1 | 8 min | 26°C | 4/30 |
| September | Too cold | 5.9 h | 5.2 | 10 min | 22°C | 5/30 |
| October | Too cold | 5.1 h | 4.3 | 12 min | 18°C | 4/30 |
| November | Too cold | 2.7 h | 2.9 | 18 min | 12°C | 5/30 |
| December | Too cold | 0.2 h | 2.1 | – | 7°C | 8/30 |
Sun window is the number of hours a day with UV Index 2.5 or higher. Full dose is the minutes at midday for about 1,000 IU of vitamin D with a quarter of the body bare, for skin type III. Rainy days are days with at least 1 mm out of 30.
What to expect in Nantucket
Cobblestone island of grey shingles and quiet beaches. A short beach season from late June to early September, cool and sometimes foggy mornings, and a cold Atlantic. Many islands get busy and pricey in July and August.
In Nantucket afternoon highs average from 4°C in January to 26°C in July. The wettest month is January (about 11 rainy days out of 30) and the driest is June (3). Midday UV peaks at 7.5 in June.
Once the capital of a global whaling empire, today Nantucket is a charming seaport town. (Wikivoyage, CC BY-SA 4.0)
More about Massachusetts · Massachusetts in June · Best places in June
Questions about Nantucket
When is the best time to visit Nantucket for vitamin D?
The best months for vitamin D in Nantucket are June to August, when a full dose takes about 7 minutes at midday.
What is the weather like in Nantucket?
Afternoon highs average from 4°C in January to 26°C in July. The wettest month is January, with about 11 rainy days out of 30.
Which months should I avoid in Nantucket?
For a beach stay, avoid the months when it is too cool from September to May.