Boston, Massachusetts: vitamin D, best months and travel guide
Historic Freedom Trail, universities and seafood. Best for: history fans, culture travellers.
The best months for vitamin D in Boston are June to September, when a full dose takes about 8 minutes at midday. Too cool from October to May.
Boston month by month
| Month | Rating | Sun window | Peak UV | Full dose, age 30 | Afternoon high | Rainy days |
|---|---|---|---|---|---|---|
| January | Too cold | 0.4 h | 2.0 | – | 3°C | 10/30 |
| February | Too cold | 3.3 h | 3.2 | 17 min | 6°C | 5/30 |
| March | Too cold | 4.4 h | 4.1 | 13 min | 9°C | 10/30 |
| April | Too cold | 5.9 h | 5.1 | 10 min | 14°C | 7/30 |
| May | Too cold | 7.0 h | 6.3 | 8 min | 21°C | 6/30 |
| June | Excellent | 8.5 h | 7.2 | 7 min | 28°C | 9/30 |
| July | Excellent | 7.9 h | 7.0 | 8 min | 30°C | 5/30 |
| August | Good | 7.4 h | 6.5 | 8 min | 27°C | 5/30 |
| September | Good | 6.2 h | 5.2 | 10 min | 23°C | 4/30 |
| October | Too cold | 4.5 h | 4.0 | 13 min | 19°C | 4/30 |
| November | Too cold | 2.2 h | 2.7 | 20 min | 13°C | 6/30 |
| December | Too cold | 0.0 h | 2.0 | – | 5°C | 10/30 |
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 Boston
Historic Freedom Trail, universities and seafood. 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 Boston afternoon highs average from 3°C in January to 30°C in July. The wettest month is January (about 10 rainy days out of 30) and the driest is October (4). Midday UV peaks at 7.2 in June.
Capital since 1630, in a variety of ways Boston finds itself in the center of it all. (Wikivoyage, CC BY-SA 4.0)
More about Massachusetts · Massachusetts in July · Best places in July
Questions about Boston
When is the best time to visit Boston for vitamin D?
The best months for vitamin D in Boston are June to September, when a full dose takes about 8 minutes at midday.
What is the weather like in Boston?
Afternoon highs average from 3°C in January to 30°C in July. The wettest month is January, with about 10 rainy days out of 30.
Which months should I avoid in Boston?
For a beach stay, avoid the months when it is too cool from October to May.