Cape Cod, Massachusetts: vitamin D, best months and travel guide
Hook-shaped peninsula of dunes, lighthouses and seafood shacks. Best for: families, couples.
The best months for vitamin D in Cape Cod are June to August, when a full dose takes about 7 minutes at midday. Too cool from September to May.
Cape Cod month by month
| Month | Rating | Sun window | Peak UV | Full dose, age 30 | Afternoon high | Rainy days |
|---|---|---|---|---|---|---|
| January | Too cold | 0.6 h | 2.0 | – | 5°C | 15/30 |
| February | Too cold | 2.9 h | 3.1 | 17 min | 5°C | 8/30 |
| March | Too cold | 4.4 h | 4.2 | 13 min | 8°C | 11/30 |
| April | Too cold | 6.5 h | 5.6 | 10 min | 13°C | 6/30 |
| May | Too cold | 7.8 h | 6.6 | 8 min | 18°C | 6/30 |
| June | Excellent | 8.3 h | 7.0 | 8 min | 23°C | 7/30 |
| July | Excellent | 8.6 h | 7.2 | 7 min | 27°C | 5/30 |
| August | Excellent | 8.0 h | 6.7 | 8 min | 25°C | 6/30 |
| September | Too cold | 5.8 h | 5.0 | 11 min | 22°C | 6/30 |
| October | Too cold | 4.8 h | 4.2 | 13 min | 17°C | 2/30 |
| November | Too cold | 2.1 h | 2.7 | 20 min | 11°C | 5/30 |
| December | Too cold | 0.1 h | 2.0 | – | 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 Cape Cod
Hook-shaped peninsula of dunes, lighthouses and seafood shacks. 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 Cape Cod afternoon highs average from 5°C in February to 27°C in July. The wettest month is January (about 15 rainy days out of 30) and the driest is October (2). Midday UV peaks at 7.2 in July.
More about Massachusetts · Massachusetts in July · Best places in July
Questions about Cape Cod
When is the best time to visit Cape Cod for vitamin D?
The best months for vitamin D in Cape Cod are June to August, when a full dose takes about 7 minutes at midday.
What is the weather like in Cape Cod?
Afternoon highs average from 5°C in February to 27°C in July. The wettest month is January, with about 15 rainy days out of 30.
Which months should I avoid in Cape Cod?
For a beach stay, avoid the months when it is too cool from September to May.